audit-labs/audit-report

Turn audit-tools evidence packages into control-mapped, auditor-ready reports.

clone: git clone https://gitbay.org/audit-labs/audit-report.git

217d893956c0f1d4f155da392546e50f6dd5cc14

verified · cmc

author: Christian Cleberg <hello@cleberg.net> · 2026-08-06T07:11:06Z

feat: control-mapped evidence reports from audit-tools packages

audit-report reads an audit-tools CSV evidence package, applies declarative
rulesets, maps each result to SOC 2 / ISO 27001 / NIST controls, and renders
Markdown, self-contained HTML, and JSON reports.

- loader: detect platform/subject from the package dir, load CSV tables
- rules: tiny condition language (all/any/not + leaf ops) and 4 check types
- engine: per-rule findings plus worst-wins control coverage rollup
- reporters: markdown, printable HTML, machine-readable json
- cli: format selection, --out, and --fail-on severity gating for CI
- bundled AWS and GitHub rulesets grounded in real audit-tools schemas
- 37 tests, ruff clean
 .gitignore                                         |  18 +
 CODEOWNERS                                         |   1 +
 LICENSE                                            | 674 +++++++++++++++++++++
 README.md                                          | 124 ++++
 audit_report/__init__.py                           |   3 +
 audit_report/__main__.py                           |   6 +
 audit_report/catalog.py                            |  58 ++
 audit_report/cli.py                                | 110 ++++
 audit_report/engine.py                             | 119 ++++
 audit_report/loader.py                             |  83 +++
 audit_report/reporters/__init__.py                 |  53 ++
 audit_report/reporters/html.py                     | 165 +++++
 audit_report/reporters/json.py                     |  42 ++
 audit_report/reporters/markdown.py                 |  95 +++
 audit_report/rules.py                              | 140 +++++
 audit_report/rulesets/aws.yaml                     | 130 ++++
 audit_report/rulesets/github.yaml                  |  79 +++
 conftest.py                                        |  11 +
 pyproject.toml                                     |  31 +
 requirements-dev.txt                               |   3 +
 requirements.txt                                   |   1 +
 ruff.toml                                          |  14 +
 .../aws_audit_acme_2026-01-01/account_security.csv |   2 +
 .../aws_audit_acme_2026-01-01/cloudtrail.csv       |   2 +
 .../aws_audit_acme_2026-01-01/iam_users.csv        |   3 +
 .../open_security_groups.csv                       |   3 +
 .../aws_audit_acme_2026-01-01/password_policy.csv  |   2 +
 .../aws_audit_acme_2026-01-01/s3_public_access.csv |   0
 .../branch_protections.csv                         |   3 +
 .../github_audit_acme_2026-01-01/org_security.csv  |   2 +
 tests/test_engine.py                               |  95 +++
 tests/test_loader.py                               |  47 ++
 tests/test_reporters.py                            |  97 +++
 tests/test_rules.py                                |  52 ++
 34 files changed, 2268 insertions(+)

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..12bb93f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,18 @@
+.venv
+venv
+
+# Python
+__pycache__/
+**/__pycache__/
+*.py[cod]
+*.egg-info/
+.pytest_cache/
+.ruff_cache/
+build/
+dist/
+
+# Generated reports
+/report/
+report.md
+report.html
+report.json
diff --git a/CODEOWNERS b/CODEOWNERS
new file mode 100644
index 0000000..d99a6ba
--- /dev/null
+++ b/CODEOWNERS
@@ -0,0 +1 @@
+*	@ccleberg @ekraai2
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f288702
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
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+  A patent license is "discriminatory" if it does not include within
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+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
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+  13. Use with the GNU Affero General Public License.
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+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
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+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
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+to choose that version for the Program.
+
+  Later license versions may give you additional or different
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+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
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+
+  If you develop a new program, and you want it to be of the greatest
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+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
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+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
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+    it under the terms of the GNU General Public License as published by
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+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
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+<https://www.gnu.org/licenses/>.
+
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+may consider it more useful to permit linking proprietary applications with
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+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..951fdb6
--- /dev/null
+++ b/README.md
@@ -0,0 +1,124 @@
+# audit-report
+
+[![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](LICENSE)
+[![Python](https://img.shields.io/badge/python-3.10%2B-blue.svg)]()
+
+Turns an [audit-tools](https://github.com/audit-labs/audit-tools) evidence
+package into a control-mapped, auditor-ready report — Markdown, self-contained
+HTML, or JSON — driven by declarative rulesets.
+
+`audit-tools` collects raw CSVs (IAM users, branch protections, security
+groups…). `audit-report` reads that package, applies pass/fail rules, maps each
+result to **SOC 2, ISO 27001, and NIST SP 800-53** controls, and produces a
+report you can hand to an auditor or gate a pipeline on.
+
+> Like [gh-attest](https://github.com/audit-labs/gh-attest), this tool produces
+> *evidence*, not a compliance verdict. A failing row means a setting is in a
+> state that does not support a control; the final judgment belongs to the
+> organization and its auditor.
+
+## Install
+
+```bash
+git clone https://github.com/audit-labs/audit-report
+cd audit-report
+python -m venv .venv && source .venv/bin/activate
+pip install -e .
+```
+
+## Usage
+
+Point it at a package directory produced by `audit-tools`:
+
+```bash
+# Markdown report to stdout (platform + ruleset auto-detected from the dir name)
+audit-report ./output/aws_audit_default_2026-07-29
+
+# All three formats into ./report/
+audit-report ./output/github_audit_acme_2026-07-29 --format md,html,json --out report/
+
+# Gate CI: exit non-zero if any high-severity check fails
+audit-report ./output/aws_audit_prod_2026-07-29 --fail-on high --out report/
+```
+
+You can also run it without installing:
+
+```bash
+python -m audit_report ./output/aws_audit_default_2026-07-29
+```
+
+### Options
+
+| Flag | Description |
+| --- | --- |
+| `--ruleset PATH` | Use a specific ruleset instead of the bundled one for the detected platform. |
+| `--format md,html,json` | One or more output formats (default: `md`). |
+| `--out DIR` | Write `report.<ext>` files into `DIR`. Without it, the first format prints to stdout. |
+| `--fail-on low\|medium\|high\|none` | Exit non-zero when a failing finding meets this severity (default: `none`). |
+
+## What a report contains
+
+- **Summary** — failing / passing / not-applicable counts.
+- **Control coverage matrix** — every cited control, its framework, and a
+  worst-wins status rolled up from the rules that reference it. One failing rule
+  marks the control as not fully evidenced.
+- **Findings** — failures first, then by severity, each with the reason, why it
+  matters, remediation, and the exact evidence rows that failed.
+
+## Bundled rulesets
+
+| Platform | Package prefix | Checks include |
+| --- | --- | --- |
+| AWS | `aws_audit_*` | Console-user MFA, access-key rotation, root MFA & keys, password policy, open SSH, public S3, CloudTrail logging |
+| GitHub | `github_audit_*` | Org 2FA, base permission, secret-scanning push protection, default-branch protection, required reviews |
+
+## Writing your own rules
+
+A ruleset is a YAML file: a `platform` and a list of `rules`. Each rule names a
+CSV table, a check, the controls it maps to, and human-readable text. Point at
+one with `--ruleset`.
+
+```yaml
+platform: aws
+rules:
+  - id: aws.iam.console-mfa
+    title: Console users have MFA enabled
+    table: iam_users            # <table>.csv inside the package
+    severity: high              # high | medium | low
+    controls: [SOC2:CC6.1, ISO:A.5.17, NIST:IA-2]
+    rationale: A console user without a second factor is one stolen password from access.
+    remediation: Enforce MFA for all console users, or remove their console password.
+    check:
+      type: fail_rows_where     # every matching row is a failure
+      when:
+        all:
+          - {column: console_password, op: is_true}
+          - {column: mfa_enabled, op: is_false}
+```
+
+**Check types**
+
+| Type | Meaning |
+| --- | --- |
+| `fail_rows_where` | Each row matching `when` is a failing finding. |
+| `fail_if_any_rows` | The presence of any row (optionally filtered by `when`) is a failure. |
+| `require_any_row` | Passes only if at least one row satisfies `when`. |
+| `assert_row` | Checks each condition in `require` against the first row of a single-row config table. |
+
+**Condition language** — a condition is a leaf `{column, op, value}`, or one of
+`{all: [...]}`, `{any: [...]}`, `{not: ...}`. Operators: `equals`, `not_equals`,
+`is_true`, `is_false`, `in`, `not_in`, `gt`, `gte`, `lt`, `lte`, `empty`,
+`not_empty`. Control codes referenced by a rule must exist in
+[`audit_report/catalog.py`](audit_report/catalog.py).
+
+## Development
+
+```bash
+pip install -e ".[dev]"
+pytest        # run from the project root
+ruff check .
+```
+
+## License
+
+GPL-3.0-or-later. See [LICENSE](LICENSE).
diff --git a/audit_report/__init__.py b/audit_report/__init__.py
new file mode 100644
index 0000000..9da2eb6
--- /dev/null
+++ b/audit_report/__init__.py
@@ -0,0 +1,3 @@
+"""audit-report — turn audit-tools evidence packages into control-mapped reports."""
+
+__version__ = "0.1.0"
diff --git a/audit_report/__main__.py b/audit_report/__main__.py
new file mode 100644
index 0000000..f2693c2
--- /dev/null
+++ b/audit_report/__main__.py
@@ -0,0 +1,6 @@
+"""Enable ``python -m audit_report``."""
+
+from .cli import main
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/audit_report/catalog.py b/audit_report/catalog.py
new file mode 100644
index 0000000..c6d4ac1
--- /dev/null
+++ b/audit_report/catalog.py
@@ -0,0 +1,58 @@
+"""Control catalog.
+
+A small, plain-language reference for every control code a ruleset may cite.
+Control codes are written as ``FRAMEWORK:CODE`` (for example ``SOC2:CC6.1``).
+The catalog is deliberately not exhaustive — it covers the codes the bundled
+rulesets actually reference. Adding a framework means adding its codes here and
+citing them from a ruleset.
+
+Like gh-attest, this tool produces *evidence*, not a compliance verdict: a
+mapping says a signal is relevant to a control, not that the control is met.
+"""
+
+# framework code -> human-readable name
+FRAMEWORKS = {
+    "SOC2": "SOC 2 (Trust Services Criteria)",
+    "ISO": "ISO/IEC 27001:2022 Annex A",
+    "NIST": "NIST SP 800-53 Rev. 5",
+}
+
+# "FRAMEWORK:CODE" -> one-line description of the control
+CONTROLS = {
+    # SOC 2 Trust Services Criteria
+    "SOC2:CC6.1": "Logical access security — restrict access to protected information assets.",
+    "SOC2:CC6.2": "Register and authorize new users before granting access.",
+    "SOC2:CC6.3": "Manage access rights based on roles and least privilege.",
+    "SOC2:CC6.6": "Restrict access from outside the system boundary.",
+    "SOC2:CC6.7": "Restrict the transmission and movement of information.",
+    "SOC2:CC7.1": "Detect and monitor for new vulnerabilities and misconfigurations.",
+    "SOC2:CC7.2": "Monitor system components for anomalies and security events.",
+    "SOC2:CC8.1": "Authorize, design, and track changes to infrastructure and software.",
+    # ISO/IEC 27001:2022 Annex A
+    "ISO:A.5.15": "Access control — rules based on business and security requirements.",
+    "ISO:A.5.17": "Authentication information — management of secrets and MFA.",
+    "ISO:A.5.18": "Access rights — provisioning, review, and removal.",
+    "ISO:A.8.2": "Privileged access rights — restricted and managed.",
+    "ISO:A.8.9": "Configuration management — secure baseline configuration.",
+    "ISO:A.8.15": "Logging — record events for monitoring and investigation.",
+    "ISO:A.8.20": "Network security — securing networks and network services.",
+    "ISO:A.8.32": "Change management — control changes to information systems.",
+    # NIST SP 800-53 Rev. 5
+    "NIST:AC-2": "Account management — establish, review, and disable accounts.",
+    "NIST:AC-6": "Least privilege — authorize the minimum access necessary.",
+    "NIST:AU-2": "Event logging — determine and record auditable events.",
+    "NIST:CM-6": "Configuration settings — establish and enforce secure settings.",
+    "NIST:IA-2": "Identification and authentication — multifactor for accounts.",
+    "NIST:IA-5": "Authenticator management — password strength and lifecycle.",
+    "NIST:SC-7": "Boundary protection — control communications at boundaries.",
+}
+
+
+def describe(control: str) -> str:
+    """Return the description for a control code, or a placeholder if unknown."""
+    return CONTROLS.get(control, "(no description on file)")
+
+
+def framework_of(control: str) -> str:
+    """Return the framework short code for a control code (text before ':')."""
+    return control.split(":", 1)[0]
diff --git a/audit_report/cli.py b/audit_report/cli.py
new file mode 100644
index 0000000..a860d64
--- /dev/null
+++ b/audit_report/cli.py
@@ -0,0 +1,110 @@
+"""Command-line entry point for audit-report."""
+
+from __future__ import annotations
+
+import argparse
+import sys
+from pathlib import Path
+
+from . import __version__, reporters
+from .engine import FAIL, evaluate
+from .loader import load_package
+from .rules import load_ruleset
+
+# Bundled rulesets ship inside the package, one per platform.
+_RULESET_DIR = Path(__file__).resolve().parent / "rulesets"
+
+_SEVERITY_ORDER = {"low": 0, "medium": 1, "high": 2}
+
+
+def _default_ruleset(platform: str) -> Path:
+    candidate = _RULESET_DIR / f"{platform}.yaml"
+    if not candidate.exists():
+        raise SystemExit(
+            f"error: no bundled ruleset for platform '{platform}'. "
+            f"Pass one with --ruleset. Available: "
+            f"{', '.join(p.stem for p in sorted(_RULESET_DIR.glob('*.yaml'))) or 'none'}"
+        )
+    return candidate
+
+
+def _parse_args(argv: list[str]) -> argparse.Namespace:
+    parser = argparse.ArgumentParser(
+        prog="audit-report",
+        description="Turn an audit-tools evidence package into a control-mapped report.",
+    )
+    parser.add_argument("package", help="path to an audit-tools output package directory")
+    parser.add_argument(
+        "--ruleset",
+        help="path to a ruleset YAML (default: bundled ruleset for the detected platform)",
+    )
+    parser.add_argument(
+        "--format",
+        default="md",
+        help="comma-separated output formats: md, html, json (default: md)",
+    )
+    parser.add_argument(
+        "--out",
+        help="directory to write report files into (default: print Markdown to stdout)",
+    )
+    parser.add_argument(
+        "--fail-on",
+        choices=["low", "medium", "high", "none"],
+        default="none",
+        help="exit non-zero if any finding fails at or above this severity (default: none)",
+    )
+    parser.add_argument("--version", action="version", version=f"audit-report {__version__}")
+    return parser.parse_args(argv)
+
+
+def _exit_code(findings, threshold: str) -> int:
+    if threshold == "none":
+        return 0
+    floor = _SEVERITY_ORDER[threshold]
+    breached = any(
+        f.status == FAIL and _SEVERITY_ORDER.get(f.rule.severity, 1) >= floor
+        for f in findings
+    )
+    return 1 if breached else 0
+
+
+def main(argv: list[str] | None = None) -> int:
+    args = _parse_args(argv if argv is not None else sys.argv[1:])
+
+    try:
+        package = load_package(args.package)
+    except (FileNotFoundError, ValueError) as exc:
+        print(f"error: {exc}", file=sys.stderr)
+        return 2
+
+    ruleset_path = Path(args.ruleset) if args.ruleset else _default_ruleset(package.platform)
+    ruleset = load_ruleset(ruleset_path)
+
+    findings = evaluate(package, ruleset)
+    report = reporters.build_report(package, findings)
+    formats = [f.strip() for f in args.format.split(",") if f.strip()]
+
+    if args.out:
+        out_dir = Path(args.out)
+        out_dir.mkdir(parents=True, exist_ok=True)
+        for fmt in formats:
+            content = reporters.render(report, fmt)
+            dest = out_dir / f"report.{reporters.EXTENSIONS[fmt]}"
+            dest.write_text(content, encoding="utf-8")
+            print(f"wrote {dest}", file=sys.stderr)
+    else:
+        # No --out: emit the first requested format to stdout.
+        print(reporters.render(report, formats[0]), end="")
+
+    counts = report.counts
+    print(
+        f"{package.platform}/{package.subject}: "
+        f"{counts[FAIL]} failing, {counts['pass']} passing, "
+        f"{counts['not_applicable']} n/a",
+        file=sys.stderr,
+    )
+    return _exit_code(findings, args.fail_on)
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/audit_report/engine.py b/audit_report/engine.py
new file mode 100644
index 0000000..0dab98d
--- /dev/null
+++ b/audit_report/engine.py
@@ -0,0 +1,119 @@
+"""Evaluate a ruleset against a loaded package to produce findings."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+
+from .loader import Package, Row
+from .rules import Rule, Ruleset, match
+
+PASS = "pass"
+FAIL = "fail"
+NOT_APPLICABLE = "not_applicable"
+
+
+@dataclass
+class Finding:
+    """The outcome of evaluating one rule against one package."""
+
+    rule: Rule
+    status: str
+    reason: str
+    evidence: list[Row] = field(default_factory=list)
+
+    @property
+    def controls(self) -> list[str]:
+        return self.rule.controls
+
+
+def _evaluate_rule(rule: Rule, package: Package) -> Finding:
+    if not package.has(rule.table):
+        return Finding(rule, NOT_APPLICABLE, f"table '{rule.table}' not in package")
+
+    rows = package.table(rule.table)
+    check = rule.check
+    ctype = check["type"]
+
+    if ctype == "assert_row":
+        return _assert_row(rule, rows)
+
+    if ctype == "require_any_row":
+        return _require_any_row(rule, rows)
+
+    # fail_rows_where / fail_if_any_rows both scan rows for failures.
+    condition = check.get("when")
+    if ctype == "fail_if_any_rows" and condition is None:
+        failing = list(rows)
+    else:
+        # fail_rows_where requires a condition; fail_if_any_rows may filter too.
+        if condition is None:
+            raise ValueError(f"{rule.id}: check needs a 'when' condition")
+        failing = [r for r in rows if match(condition, r)]
+
+    if failing:
+        noun = "row" if len(failing) == 1 else "rows"
+        return Finding(rule, FAIL, f"{len(failing)} {noun} failed the check", failing)
+
+    # A present-but-empty table means the scan found nothing to fault — the
+    # absence of bad rows is a pass (e.g. no publicly readable buckets).
+    if not rows:
+        return Finding(rule, PASS, "no rows present — no violations found")
+    return Finding(rule, PASS, f"all {len(rows)} rows passed the check")
+
+
+def _assert_row(rule: Rule, rows: list[Row]) -> Finding:
+    """Assert conditions against a single-row configuration table."""
+    if not rows:
+        return Finding(rule, NOT_APPLICABLE, f"table '{rule.table}' is empty")
+
+    row = rows[0]
+    failed = [req for req in rule.check.get("require", []) if not match(req, row)]
+    if failed:
+        columns = ", ".join(req.get("column", "?") for req in failed)
+        return Finding(rule, FAIL, f"configuration failed on: {columns}", [row])
+    return Finding(rule, PASS, "configuration meets all requirements")
+
+
+def _require_any_row(rule: Rule, rows: list[Row]) -> Finding:
+    """Pass if at least one row satisfies the condition; fail otherwise."""
+    condition = rule.check.get("when")
+    if condition is None:
+        raise ValueError(f"{rule.id}: require_any_row needs a 'when' condition")
+    if any(match(condition, row) for row in rows):
+        return Finding(rule, PASS, "at least one row satisfies the requirement")
+    reason = "no row satisfies the requirement" if rows else f"table '{rule.table}' is empty"
+    return Finding(rule, FAIL, reason, rows)
+
+
+def evaluate(package: Package, ruleset: Ruleset) -> list[Finding]:
+    """Run every rule in *ruleset* against *package*."""
+    return [_evaluate_rule(rule, package) for rule in ruleset.rules]
+
+
+def summarize(findings: list[Finding]) -> dict[str, int]:
+    """Count findings by status."""
+    counts = {PASS: 0, FAIL: 0, NOT_APPLICABLE: 0}
+    for finding in findings:
+        counts[finding.status] += 1
+    return counts
+
+
+# Worst-wins ordering when rolling several findings up to one control.
+_STATUS_RANK = {FAIL: 2, PASS: 1, NOT_APPLICABLE: 0}
+
+
+def control_coverage(findings: list[Finding]) -> dict[str, dict]:
+    """Roll findings up to a per-control view.
+
+    Returns ``{control: {"status": ..., "rules": [rule_id, ...]}}`` where a
+    control's status is the worst status among the rules that cite it — one
+    failing rule means the control is not fully evidenced.
+    """
+    coverage: dict[str, dict] = {}
+    for finding in findings:
+        for control in finding.controls:
+            entry = coverage.setdefault(control, {"status": NOT_APPLICABLE, "rules": []})
+            entry["rules"].append(finding.rule.id)
+            if _STATUS_RANK[finding.status] > _STATUS_RANK[entry["status"]]:
+                entry["status"] = finding.status
+    return dict(sorted(coverage.items()))
diff --git a/audit_report/loader.py b/audit_report/loader.py
new file mode 100644
index 0000000..abdeac7
--- /dev/null
+++ b/audit_report/loader.py
@@ -0,0 +1,83 @@
+"""Load an audit-tools evidence package from disk.
+
+An evidence package is a directory of CSV files produced by audit-tools, named
+like ``github_audit_<org>_<date>/`` or ``aws_audit_<profile>_<date>/``. Each CSV
+becomes a *table* keyed by its filename stem (``iam_users.csv`` -> ``iam_users``).
+"""
+
+from __future__ import annotations
+
+import csv
+from dataclasses import dataclass, field
+from pathlib import Path
+
+# Directory-name prefixes audit-tools uses, mapped to a platform key.
+_PLATFORM_PREFIXES = {
+    "aws_audit_": "aws",
+    "github_audit_": "github",
+    "gitlab_audit_": "gitlab",
+}
+
+Row = dict[str, str]
+Table = list[Row]
+
+
+@dataclass
+class Package:
+    """A loaded evidence package."""
+
+    path: Path
+    platform: str
+    subject: str  # the org / profile the audit was run against
+    tables: dict[str, Table] = field(default_factory=dict)
+
+    def table(self, name: str) -> Table:
+        """Return a table by name, or an empty list if it is absent."""
+        return self.tables.get(name, [])
+
+    def has(self, name: str) -> bool:
+        """True if the named CSV was present in the package."""
+        return name in self.tables
+
+
+def detect_platform(dir_name: str) -> tuple[str, str]:
+    """Infer ``(platform, subject)`` from a package directory name.
+
+    ``github_audit_audit-labs_2026-07-29`` -> ``("github", "audit-labs")``.
+    Falls back to ``("unknown", <dir_name>)`` when no prefix matches.
+    """
+    for prefix, platform in _PLATFORM_PREFIXES.items():
+        if dir_name.startswith(prefix):
+            rest = dir_name[len(prefix) :]
+            # Strip a trailing ISO date (…_YYYY-MM-DD) to recover the subject.
+            parts = rest.rsplit("_", 1)
+            subject = parts[0] if len(parts) == 2 and _looks_like_date(parts[1]) else rest
+            return platform, subject or "unknown"
+    return "unknown", dir_name
+
+
+def _looks_like_date(token: str) -> bool:
+    bits = token.split("-")
+    return len(bits) == 3 and all(b.isdigit() for b in bits)
+
+
+def load_package(path: str | Path) -> Package:
+    """Load every ``*.csv`` in *path* into a :class:`Package`.
+
+    Raises ``FileNotFoundError`` if the directory does not exist and
+    ``ValueError`` if it contains no CSV files.
+    """
+    directory = Path(path)
+    if not directory.is_dir():
+        raise FileNotFoundError(f"not a directory: {directory}")
+
+    platform, subject = detect_platform(directory.name)
+    tables: dict[str, Table] = {}
+    for csv_path in sorted(directory.glob("*.csv")):
+        with csv_path.open(newline="", encoding="utf-8") as handle:
+            tables[csv_path.stem] = list(csv.DictReader(handle))
+
+    if not tables:
+        raise ValueError(f"no CSV files found in {directory}")
+
+    return Package(path=directory, platform=platform, subject=subject, tables=tables)
diff --git a/audit_report/reporters/__init__.py b/audit_report/reporters/__init__.py
new file mode 100644
index 0000000..ad4e968
--- /dev/null
+++ b/audit_report/reporters/__init__.py
@@ -0,0 +1,53 @@
+"""Report renderers. Each takes a :class:`Report` and returns a string."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from datetime import datetime, timezone
+
+from ..engine import Finding, control_coverage, summarize
+from ..loader import Package
+from . import html as _html
+from . import json as _json
+from . import markdown as _markdown
+
+
+@dataclass
+class Report:
+    """Everything a renderer needs: the package, findings, and rollups."""
+
+    package: Package
+    findings: list[Finding]
+    generated_at: str
+
+    @property
+    def counts(self) -> dict[str, int]:
+        return summarize(self.findings)
+
+    @property
+    def coverage(self) -> dict[str, dict]:
+        return control_coverage(self.findings)
+
+
+def build_report(package: Package, findings: list[Finding]) -> Report:
+    """Assemble a :class:`Report` with a UTC generation timestamp."""
+    stamp = datetime.now(timezone.utc).strftime("%Y-%m-%d %H:%M UTC")
+    return Report(package=package, findings=findings, generated_at=stamp)
+
+
+RENDERERS = {
+    "md": _markdown.render,
+    "html": _html.render,
+    "json": _json.render,
+}
+
+# File extension per format (md and markdown both write .md).
+EXTENSIONS = {"md": "md", "html": "html", "json": "json"}
+
+
+def render(report: Report, fmt: str) -> str:
+    """Render *report* in the named format ('md', 'html', or 'json')."""
+    try:
+        return RENDERERS[fmt](report)
+    except KeyError:
+        raise ValueError(f"unknown format: {fmt!r}") from None
diff --git a/audit_report/reporters/html.py b/audit_report/reporters/html.py
new file mode 100644
index 0000000..d34bebd
--- /dev/null
+++ b/audit_report/reporters/html.py
@@ -0,0 +1,165 @@
+"""HTML renderer — a self-contained, printable evidence report.
+
+No external assets: all CSS is inlined so the file can be attached to an audit
+workpaper and opened anywhere, including offline.
+"""
+
+from __future__ import annotations
+
+from html import escape
+from typing import TYPE_CHECKING
+
+from .. import catalog
+from ..engine import FAIL, NOT_APPLICABLE, PASS
+
+if TYPE_CHECKING:
+    from . import Report
+
+_STATUS_LABEL = {PASS: "PASS", FAIL: "FAIL", NOT_APPLICABLE: "N/A"}
+_STATUS_CLASS = {PASS: "pass", FAIL: "fail", NOT_APPLICABLE: "na"}
+_SEVERITY_ORDER = {"high": 0, "medium": 1, "low": 2}
+
+_CSS = """
+:root { color-scheme: light dark; }
+* { box-sizing: border-box; }
+body { font-family: -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
+  margin: 0; padding: 2rem; line-height: 1.5; color: #1a1a1a; background: #fff; }
+main { max-width: 60rem; margin: 0 auto; }
+h1 { margin: 0 0 .25rem; font-size: 1.6rem; }
+h2 { margin: 2rem 0 .75rem; font-size: 1.25rem; border-bottom: 2px solid #e5e5e5; padding-bottom: .25rem; }
+.meta { color: #555; font-size: .9rem; margin: 0 0 1rem; }
+.meta code { background: #f2f2f2; padding: .05rem .3rem; border-radius: 3px; }
+.note { background: #f7f7f9; border-left: 3px solid #b9b9c6; padding: .6rem .9rem;
+  font-size: .9rem; color: #444; border-radius: 0 4px 4px 0; }
+table { border-collapse: collapse; width: 100%; font-size: .85rem; margin: .5rem 0; }
+th, td { border: 1px solid #e0e0e0; padding: .35rem .5rem; text-align: left; vertical-align: top; }
+th { background: #f5f5f7; }
+.badge { display: inline-block; font-weight: 700; font-size: .72rem; letter-spacing: .03em;
+  padding: .12rem .5rem; border-radius: 999px; }
+.badge.pass { background: #e5f6ea; color: #1a7f37; }
+.badge.fail { background: #fdeaea; color: #c1272d; }
+.badge.na { background: #eee; color: #666; }
+.finding { border: 1px solid #e5e5e5; border-radius: 6px; padding: 1rem 1.1rem; margin: .8rem 0; }
+.finding.fail { border-left: 4px solid #c1272d; }
+.finding.pass { border-left: 4px solid #1a7f37; }
+.finding.na { border-left: 4px solid #bbb; }
+.finding h3 { margin: 0 0 .5rem; font-size: 1.05rem; display: flex; gap: .5rem; align-items: center; }
+.finding dl { display: grid; grid-template-columns: max-content 1fr; gap: .2rem .8rem; margin: .4rem 0 0; font-size: .9rem; }
+.finding dt { color: #666; font-weight: 600; }
+.finding dd { margin: 0; }
+.summary-pills span { display: inline-block; margin-right: .5rem; font-weight: 600; }
+footer { margin-top: 3rem; font-size: .8rem; color: #888; border-top: 1px solid #eee; padding-top: .75rem; }
+@media (prefers-color-scheme: dark) {
+  body { color: #e6e6e6; background: #16171a; }
+  h2 { border-color: #333; }
+  .meta { color: #aaa; } .meta code { background: #26272b; }
+  .note { background: #1e1f24; border-color: #444; color: #bbb; }
+  th, td { border-color: #333; } th { background: #202126; }
+  .finding { border-color: #2d2e33; }
+  .badge.pass { background: #12321d; color: #4ac36a; }
+  .badge.fail { background: #3a1416; color: #ff6b70; }
+  .badge.na { background: #26272b; color: #999; }
+  footer { border-color: #2a2b30; }
+}
+"""
+
+
+def _badge(status: str) -> str:
+    return f'<span class="badge {_STATUS_CLASS[status]}">{_STATUS_LABEL[status]}</span>'
+
+
+def _evidence_table(rows: list[dict[str, str]]) -> str:
+    shown = rows[:10]
+    headers = list(shown[0].keys())
+    head = "".join(f"<th>{escape(h)}</th>" for h in headers)
+    body = "".join(
+        "<tr>" + "".join(f"<td>{escape(str(r.get(h, '')))}</td>" for h in headers) + "</tr>"
+        for r in shown
+    )
+    extra = (
+        f"<p class='meta'>+{len(rows) - len(shown)} more row(s) omitted.</p>"
+        if len(rows) > len(shown)
+        else ""
+    )
+    return f"<table><thead><tr>{head}</tr></thead><tbody>{body}</tbody></table>{extra}"
+
+
+def render(report: Report) -> str:
+    pkg = report.package
+    counts = report.counts
+    parts: list[str] = []
+
+    parts.append(f"<h1>Evidence Report — {escape(pkg.subject)}</h1>")
+    parts.append(
+        f"<p class='meta'>Platform <code>{escape(pkg.platform)}</code> · "
+        f"Source <code>{escape(pkg.path.name)}</code> · "
+        f"Generated {escape(report.generated_at)}</p>"
+    )
+    parts.append(
+        "<p class='summary-pills'>"
+        f"<span>{_badge(FAIL)} {counts[FAIL]} failing</span>"
+        f"<span>{_badge(PASS)} {counts[PASS]} passing</span>"
+        f"<span>{_badge(NOT_APPLICABLE)} {counts[NOT_APPLICABLE]} not applicable</span>"
+        "</p>"
+    )
+    parts.append(
+        "<p class='note'>This report presents <strong>evidence</strong>, not a "
+        "compliance verdict. A failing row means a setting is in a state that does "
+        "not support a control; the final judgment belongs to the organization and "
+        "its auditor.</p>"
+    )
+
+    # Coverage matrix.
+    parts.append("<h2>Control coverage</h2>")
+    cov_rows = "".join(
+        f"<tr><td>{escape(control)}</td><td>{escape(catalog.framework_of(control))}</td>"
+        f"<td>{_badge(entry['status'])}</td>"
+        f"<td><code>{escape(', '.join(entry['rules']))}</code></td>"
+        f"<td>{escape(catalog.describe(control))}</td></tr>"
+        for control, entry in report.coverage.items()
+    )
+    parts.append(
+        "<table><thead><tr><th>Control</th><th>Framework</th><th>Status</th>"
+        f"<th>Checked by</th><th>Description</th></tr></thead><tbody>{cov_rows}</tbody></table>"
+    )
+
+    # Findings.
+    parts.append("<h2>Findings</h2>")
+    ordered = sorted(
+        report.findings,
+        key=lambda f: (f.status != FAIL, _SEVERITY_ORDER.get(f.rule.severity, 1)),
+    )
+    for finding in ordered:
+        rule = finding.rule
+        rows = [
+            f"<dt>Rule</dt><dd><code>{escape(rule.id)}</code> · {escape(rule.severity)}</dd>",
+            f"<dt>Controls</dt><dd>{escape(', '.join(rule.controls) or '—')}</dd>",
+            f"<dt>Result</dt><dd>{escape(finding.reason)}</dd>",
+        ]
+        if rule.rationale:
+            rows.append(f"<dt>Why it matters</dt><dd>{escape(rule.rationale.strip())}</dd>")
+        if finding.status == FAIL and rule.remediation:
+            rows.append(f"<dt>Remediation</dt><dd>{escape(rule.remediation.strip())}</dd>")
+        evidence = (
+            _evidence_table(finding.evidence)
+            if finding.status == FAIL and finding.evidence
+            else ""
+        )
+        parts.append(
+            f"<div class='finding {_STATUS_CLASS[finding.status]}'>"
+            f"<h3>{_badge(finding.status)} {escape(rule.title)}</h3>"
+            f"<dl>{''.join(rows)}</dl>{evidence}</div>"
+        )
+
+    parts.append(
+        "<footer>Generated by audit-report · Audit Labs · "
+        "evidence, not a verdict.</footer>"
+    )
+
+    body = "\n".join(parts)
+    return (
+        "<!doctype html><html lang='en'><head><meta charset='utf-8'>"
+        "<meta name='viewport' content='width=device-width, initial-scale=1'>"
+        f"<title>Evidence Report — {escape(pkg.subject)}</title>"
+        f"<style>{_CSS}</style></head><body><main>{body}</main></body></html>\n"
+    )
diff --git a/audit_report/reporters/json.py b/audit_report/reporters/json.py
new file mode 100644
index 0000000..04d8159
--- /dev/null
+++ b/audit_report/reporters/json.py
@@ -0,0 +1,42 @@
+"""JSON renderer — a machine-readable record of the same findings.
+
+Useful for feeding results into a dashboard, a ticket pipeline, or a diff
+between two audit runs.
+"""
+
+from __future__ import annotations
+
+import json as _json
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from . import Report
+
+
+def to_dict(report: Report) -> dict:
+    """Serialize a report to a plain dict (stable key order for diffing)."""
+    pkg = report.package
+    return {
+        "subject": pkg.subject,
+        "platform": pkg.platform,
+        "source_package": pkg.path.name,
+        "generated_at": report.generated_at,
+        "summary": report.counts,
+        "coverage": report.coverage,
+        "findings": [
+            {
+                "id": f.rule.id,
+                "title": f.rule.title,
+                "status": f.status,
+                "severity": f.rule.severity,
+                "controls": f.rule.controls,
+                "reason": f.reason,
+                "evidence": f.evidence,
+            }
+            for f in report.findings
+        ],
+    }
+
+
+def render(report: Report) -> str:
+    return _json.dumps(to_dict(report), indent=2, sort_keys=False) + "\n"
diff --git a/audit_report/reporters/markdown.py b/audit_report/reporters/markdown.py
new file mode 100644
index 0000000..5c45ee2
--- /dev/null
+++ b/audit_report/reporters/markdown.py
@@ -0,0 +1,95 @@
+"""Markdown renderer — the auditor-facing evidence report."""
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from .. import catalog
+from ..engine import FAIL, NOT_APPLICABLE, PASS
+
+if TYPE_CHECKING:
+    from . import Report
+
+_STATUS_LABEL = {PASS: "PASS", FAIL: "FAIL", NOT_APPLICABLE: "N/A"}
+_SEVERITY_ORDER = {"high": 0, "medium": 1, "low": 2}
+
+
+def _evidence_table(rows: list[dict[str, str]]) -> list[str]:
+    """Render up to a handful of evidence rows as a Markdown table."""
+    if not rows:
+        return []
+    shown = rows[:10]
+    headers = list(shown[0].keys())
+    lines = [
+        "| " + " | ".join(headers) + " |",
+        "| " + " | ".join("---" for _ in headers) + " |",
+    ]
+    for row in shown:
+        lines.append("| " + " | ".join(str(row.get(h, "")) for h in headers) + " |")
+    if len(rows) > len(shown):
+        lines.append(f"\n_+{len(rows) - len(shown)} more row(s) omitted._")
+    return lines
+
+
+def render(report: Report) -> str:
+    pkg = report.package
+    counts = report.counts
+    out: list[str] = []
+
+    out.append(f"# Evidence Report — {pkg.subject}")
+    out.append("")
+    out.append(f"- **Platform:** {pkg.platform}")
+    out.append(f"- **Subject:** {pkg.subject}")
+    out.append(f"- **Source package:** `{pkg.path.name}`")
+    out.append(f"- **Generated:** {report.generated_at}")
+    out.append(
+        f"- **Result:** {counts[FAIL]} failing · {counts[PASS]} passing · "
+        f"{counts[NOT_APPLICABLE]} not applicable"
+    )
+    out.append("")
+    out.append(
+        "> This report presents *evidence*, not a compliance verdict. A failing "
+        "row means a setting is in a state that does not support a control; the "
+        "final judgment belongs to the organization and its auditor."
+    )
+    out.append("")
+
+    # Control coverage matrix.
+    out.append("## Control coverage")
+    out.append("")
+    out.append("| Control | Framework | Status | Checked by | Description |")
+    out.append("| --- | --- | --- | --- | --- |")
+    for control, entry in report.coverage.items():
+        out.append(
+            f"| {control} | {catalog.framework_of(control)} | "
+            f"{_STATUS_LABEL[entry['status']]} | {', '.join(entry['rules'])} | "
+            f"{catalog.describe(control)} |"
+        )
+    out.append("")
+
+    # Findings, failures first then by severity.
+    out.append("## Findings")
+    out.append("")
+    ordered = sorted(
+        report.findings,
+        key=lambda f: (f.status != FAIL, _SEVERITY_ORDER.get(f.rule.severity, 1)),
+    )
+    for finding in ordered:
+        rule = finding.rule
+        out.append(f"### {_STATUS_LABEL[finding.status]} · {rule.title}")
+        out.append("")
+        out.append(f"- **Rule:** `{rule.id}`  ·  **Severity:** {rule.severity}")
+        out.append(f"- **Controls:** {', '.join(rule.controls) or '—'}")
+        out.append(f"- **Result:** {finding.reason}")
+        if rule.rationale:
+            out.append(f"- **Why it matters:** {rule.rationale.strip()}")
+        if finding.status == FAIL and rule.remediation:
+            out.append(f"- **Remediation:** {rule.remediation.strip()}")
+        out.append("")
+        if finding.status == FAIL and finding.evidence:
+            out.append("**Evidence:**")
+            out.append("")
+            out.extend(_evidence_table(finding.evidence))
+            out.append("")
+
+    return "\n".join(out).rstrip() + "\n"
diff --git a/audit_report/rules.py b/audit_report/rules.py
new file mode 100644
index 0000000..8135502
--- /dev/null
+++ b/audit_report/rules.py
@@ -0,0 +1,140 @@
+"""Rule model and the small condition language rulesets are written in.
+
+A **ruleset** is a YAML file: a platform name plus a list of rules. Each rule
+names a table, a check, the controls it maps to, and human text. Checks are
+evaluated by :mod:`audit_report.engine`.
+
+The condition language is intentionally tiny. A *condition* is one of:
+
+* a leaf ``{column, op, value}`` — test one column of a row
+* ``{all: [cond, ...]}`` — every sub-condition holds
+* ``{any: [cond, ...]}`` — at least one holds
+* ``{not: cond}`` — the sub-condition does not hold
+
+Operators (``op``): ``equals``, ``not_equals``, ``is_true``, ``is_false``,
+``in``, ``not_in``, ``gt``, ``gte``, ``lt``, ``lte``, ``empty``, ``not_empty``.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from pathlib import Path
+
+import yaml
+
+_TRUTHY = {"true", "yes", "1", "y", "t", "enabled", "on"}
+_FALSY = {"false", "no", "0", "n", "f", "disabled", "off", ""}
+
+VALID_CHECK_TYPES = {
+    "fail_rows_where",
+    "fail_if_any_rows",
+    "assert_row",
+    "require_any_row",
+}
+
+
+@dataclass
+class Rule:
+    """A single control check declared in a ruleset."""
+
+    id: str
+    title: str
+    table: str
+    check: dict
+    severity: str = "medium"
+    controls: list[str] = field(default_factory=list)
+    rationale: str = ""
+    remediation: str = ""
+
+
+@dataclass
+class Ruleset:
+    """A named collection of rules for one platform."""
+
+    platform: str
+    rules: list[Rule]
+
+
+def _as_number(value: str) -> float | None:
+    try:
+        return float(value)
+    except (TypeError, ValueError):
+        return None
+
+
+def match(condition: dict, row: dict[str, str]) -> bool:
+    """Return True if *condition* holds for *row*.
+
+    Raises ``ValueError`` on a malformed condition so ruleset bugs surface
+    loudly rather than silently evaluating to False.
+    """
+    if "all" in condition:
+        return all(match(c, row) for c in condition["all"])
+    if "any" in condition:
+        return any(match(c, row) for c in condition["any"])
+    if "not" in condition:
+        return not match(condition["not"], row)
+
+    column = condition.get("column")
+    op = condition.get("op")
+    if column is None or op is None:
+        raise ValueError(f"malformed condition: {condition!r}")
+
+    raw = row.get(column, "")
+    value = condition.get("value")
+    norm = raw.strip().lower()
+
+    if op == "equals":
+        return norm == str(value).strip().lower()
+    if op == "not_equals":
+        return norm != str(value).strip().lower()
+    if op == "is_true":
+        return norm in _TRUTHY
+    if op == "is_false":
+        return norm in _FALSY
+    if op == "empty":
+        return raw.strip() == ""
+    if op == "not_empty":
+        return raw.strip() != ""
+    if op in ("in", "not_in"):
+        choices = {str(v).strip().lower() for v in (value or [])}
+        return (norm in choices) if op == "in" else (norm not in choices)
+    if op in ("gt", "gte", "lt", "lte"):
+        left, right = _as_number(raw), _as_number(str(value))
+        if left is None or right is None:
+            return False
+        return {
+            "gt": left > right,
+            "gte": left >= right,
+            "lt": left < right,
+            "lte": left <= right,
+        }[op]
+
+    raise ValueError(f"unknown operator: {op!r}")
+
+
+def load_ruleset(path: str | Path) -> Ruleset:
+    """Parse a ruleset YAML file into a :class:`Ruleset`, validating each rule."""
+    data = yaml.safe_load(Path(path).read_text(encoding="utf-8")) or {}
+    platform = data.get("platform")
+    if not platform:
+        raise ValueError(f"{path}: ruleset is missing a 'platform'")
+
+    rules: list[Rule] = []
+    for entry in data.get("rules", []):
+        rule = Rule(
+            id=entry["id"],
+            title=entry["title"],
+            table=entry["table"],
+            check=entry["check"],
+            severity=entry.get("severity", "medium"),
+            controls=entry.get("controls", []),
+            rationale=entry.get("rationale", ""),
+            remediation=entry.get("remediation", ""),
+        )
+        check_type = rule.check.get("type")
+        if check_type not in VALID_CHECK_TYPES:
+            raise ValueError(f"{rule.id}: unknown check type {check_type!r}")
+        rules.append(rule)
+
+    return Ruleset(platform=platform, rules=rules)
diff --git a/audit_report/rulesets/aws.yaml b/audit_report/rulesets/aws.yaml
new file mode 100644
index 0000000..3a890fd
--- /dev/null
+++ b/audit_report/rulesets/aws.yaml
@@ -0,0 +1,130 @@
+# Ruleset: AWS
+#
+# Evaluated against an audit-tools AWS evidence package
+# (aws_audit_<profile>_<date>/). Each rule names a CSV table, a check, and the
+# controls the signal is offered as evidence for. A "fail" means a setting is in
+# a state that does NOT support the control — an auditor still owns the verdict.
+platform: aws
+
+rules:
+  - id: aws.iam.console-mfa
+    title: Console users have MFA enabled
+    table: iam_users
+    severity: high
+    controls: [SOC2:CC6.1, ISO:A.5.17, NIST:IA-2]
+    rationale: >
+      A user who can sign in to the console without a second factor is a single
+      stolen password away from account access. MFA is the baseline control for
+      interactive human access.
+    remediation: Enforce MFA for all IAM users with console access, or remove their console password.
+    check:
+      type: fail_rows_where
+      when:
+        all:
+          - {column: console_password, op: is_true}
+          - {column: mfa_enabled, op: is_false}
+
+  - id: aws.iam.key-rotation
+    title: Access keys are rotated within 90 days
+    table: iam_users
+    severity: medium
+    controls: [ISO:A.5.17, NIST:IA-5]
+    rationale: >
+      Long-lived access keys widen the window in which a leaked credential is
+      useful. Rotating keys bounds that exposure.
+    remediation: Rotate or delete access keys older than 90 days.
+    check:
+      type: fail_rows_where
+      when: {column: oldest_key_age_days, op: gt, value: 90}
+
+  - id: aws.root.mfa
+    title: Root account has MFA enabled
+    table: account_security
+    severity: high
+    controls: [SOC2:CC6.1, ISO:A.8.2, NIST:IA-2]
+    rationale: >
+      The root account can perform every action in the account and cannot be
+      restricted by IAM policy. MFA on root is a foundational control.
+    remediation: Enable a hardware or virtual MFA device on the root user.
+    check:
+      type: assert_row
+      require:
+        - {column: root_mfa_enabled, op: is_true}
+
+  - id: aws.root.no-access-keys
+    title: Root account has no access keys
+    table: account_security
+    severity: high
+    controls: [SOC2:CC6.1, ISO:A.8.2, NIST:AC-6]
+    rationale: >
+      Programmatic root access keys are unnecessary and dangerous — anything
+      root can do should be done through named, least-privilege identities.
+    remediation: Delete all access keys on the root user.
+    check:
+      type: assert_row
+      require:
+        - {column: root_access_keys_present, op: is_false}
+
+  - id: aws.iam.password-policy
+    title: Account password policy meets baseline strength
+    table: password_policy
+    severity: medium
+    controls: [ISO:A.5.17, NIST:IA-5]
+    rationale: >
+      A weak password policy undermines every password-based control. The
+      baseline here — length, complexity, and rotation — reflects common
+      hardening guidance.
+    remediation: Set a minimum length of 14, require symbols and numbers, and cap password age at 90 days.
+    check:
+      type: assert_row
+      require:
+        - {column: minimum_length, op: gte, value: 14}
+        - {column: require_symbols, op: is_true}
+        - {column: require_numbers, op: is_true}
+        - {column: max_age_days, op: lte, value: 90}
+
+  - id: aws.network.no-open-ssh
+    title: No security group exposes SSH to the internet
+    table: open_security_groups
+    severity: high
+    controls: [SOC2:CC6.6, ISO:A.8.20, NIST:SC-7]
+    rationale: >
+      SSH (port 22) reachable from 0.0.0.0/0 invites credential-stuffing and
+      exploitation of the host directly from the public internet.
+    remediation: Restrict inbound SSH to known CIDR ranges or a bastion, or use SSM Session Manager.
+    check:
+      type: fail_rows_where
+      when:
+        all:
+          - {column: open_to, op: equals, value: 0.0.0.0/0}
+          - {column: from_port, op: lte, value: 22}
+          - {column: to_port, op: gte, value: 22}
+
+  - id: aws.s3.no-public-access
+    title: No S3 bucket allows public access
+    table: s3_public_access
+    severity: high
+    controls: [SOC2:CC6.6, ISO:A.8.20, NIST:SC-7]
+    rationale: >
+      Publicly readable or writable buckets are a leading cause of data
+      exposure. audit-tools lists only buckets that permit public access, so any
+      row here is a finding.
+    remediation: Enable Block Public Access at the account and bucket level; remove public bucket policies and ACLs.
+    check:
+      type: fail_if_any_rows
+
+  - id: aws.cloudtrail.logging
+    title: A multi-region CloudTrail is actively logging
+    table: cloudtrail
+    severity: high
+    controls: [SOC2:CC7.2, ISO:A.8.15, NIST:AU-2]
+    rationale: >
+      Without an active trail there is no reliable record of account activity —
+      the evidence auditors and responders rely on simply does not exist.
+    remediation: Enable a multi-region CloudTrail with log file validation and confirm it is logging.
+    check:
+      type: require_any_row
+      when:
+        all:
+          - {column: is_logging, op: is_true}
+          - {column: multi_region, op: is_true}
diff --git a/audit_report/rulesets/github.yaml b/audit_report/rulesets/github.yaml
new file mode 100644
index 0000000..88e5c95
--- /dev/null
+++ b/audit_report/rulesets/github.yaml
@@ -0,0 +1,79 @@
+# Ruleset: GitHub
+#
+# Evaluated against an audit-tools GitHub evidence package
+# (github_audit_<org>_<date>/). Complements gh-attest: same spirit of mapping
+# GitHub signals to controls, applied offline to a captured CSV package.
+platform: github
+
+rules:
+  - id: github.org.require-2fa
+    title: Organization requires two-factor authentication
+    table: org_security
+    severity: high
+    controls: [SOC2:CC6.1, ISO:A.5.17, NIST:IA-2]
+    rationale: >
+      Org-enforced 2FA raises the floor for every member at once. Without it, a
+      single member with a weak or reused password is an org-wide risk.
+    remediation: Enable "Require two-factor authentication" in the organization security settings.
+    check:
+      type: assert_row
+      require:
+        - {column: two_factor_required, op: is_true}
+
+  - id: github.org.default-permission
+    title: Base repository permission is read or less
+    table: org_security
+    severity: medium
+    controls: [SOC2:CC6.3, ISO:A.5.15, NIST:AC-6]
+    rationale: >
+      A permissive base permission (write/admin for all members) violates least
+      privilege by granting broad access that should be explicit.
+    remediation: Set the organization base permission to "read" or "none" and grant write/admin per team.
+    check:
+      type: assert_row
+      require:
+        - {column: default_repo_permission, op: in, value: [read, none]}
+
+  - id: github.org.secret-scanning
+    title: Secret scanning push protection is on for new repos
+    table: org_security
+    severity: medium
+    controls: [SOC2:CC7.1, ISO:A.5.17, NIST:CM-6]
+    rationale: >
+      Push protection stops secrets from entering history in the first place,
+      which is far cheaper than rotating a leaked credential after the fact.
+    remediation: Enable secret scanning and push protection for new repositories at the org level.
+    check:
+      type: assert_row
+      require:
+        - {column: secret_scanning_push_protection_for_new_repos, op: is_true}
+
+  - id: github.branch.default-protected
+    title: Default branches are protected
+    table: branch_protections
+    severity: high
+    controls: [SOC2:CC8.1, ISO:A.8.32, NIST:CM-6]
+    rationale: >
+      An unprotected default branch can be force-pushed or have its history
+      rewritten with no review — the change-management trail auditors expect is
+      absent.
+    remediation: Add a branch protection rule or ruleset covering the default branch of each repository.
+    check:
+      type: fail_rows_where
+      when: {column: protected, op: is_false}
+
+  - id: github.branch.require-reviews
+    title: Protected branches require at least one review
+    table: branch_protections
+    severity: medium
+    controls: [SOC2:CC8.1, ISO:A.8.32, NIST:CM-6]
+    rationale: >
+      Required review is the core segregation-of-duties control in the SDLC: no
+      change reaches the default branch without a second person approving it.
+    remediation: Require at least one approving review on the default branch.
+    check:
+      type: fail_rows_where
+      when:
+        all:
+          - {column: protected, op: is_true}
+          - {column: required_reviews, op: lt, value: 1}
diff --git a/conftest.py b/conftest.py
new file mode 100644
index 0000000..fbcad10
--- /dev/null
+++ b/conftest.py
@@ -0,0 +1,11 @@
+"""Ensure the project root is importable and tests run from it.
+
+Tests reference the bundled rulesets by the relative path
+``audit_report/rulesets``, so pytest must be invoked from the project root.
+This file's location pins that root for import resolution.
+"""
+
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).parent))
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..ec04947
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,31 @@
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "audit-report"
+version = "0.1.0"
+description = "Turn audit-tools evidence packages into control-mapped, auditor-ready reports."
+readme = "README.md"
+requires-python = ">=3.10"
+license = { text = "GPL-3.0-or-later" }
+authors = [{ name = "Audit Labs" }]
+dependencies = ["PyYAML>=6.0"]
+
+[project.optional-dependencies]
+dev = ["pytest>=8.0", "ruff>=0.5"]
+
+[project.scripts]
+audit-report = "audit_report.cli:main"
+
+[project.urls]
+Homepage = "https://audit-labs.dev"
+Repository = "https://github.com/audit-labs/audit-report"
+
+[tool.setuptools]
+packages = ["audit_report", "audit_report.reporters"]
+include-package-data = true
+
+[tool.setuptools.package-data]
+# Ship the bundled rulesets inside the wheel so the CLI works after install.
+"audit_report" = ["rulesets/*.yaml"]
diff --git a/requirements-dev.txt b/requirements-dev.txt
new file mode 100644
index 0000000..336b1c7
--- /dev/null
+++ b/requirements-dev.txt
@@ -0,0 +1,3 @@
+PyYAML>=6.0
+pytest>=8.0
+ruff>=0.5
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..c1a201d
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+PyYAML>=6.0
diff --git a/ruff.toml b/ruff.toml
new file mode 100644
index 0000000..21b1a5a
--- /dev/null
+++ b/ruff.toml
@@ -0,0 +1,14 @@
+# Ruff configuration for audit-tools.
+#
+# A few lint rules are disabled because they flag patterns this project uses
+# deliberately:
+#
+#   BLE001 - The audit collectors and their CLI wrappers intentionally catch
+#            broad exceptions so that one failing check never aborts a whole
+#            audit run. The error is reported and collection continues.
+#   DTZ011 - date.today() is used to build human-facing, date-stamped output
+#            folder names, where the local date is the intended value.
+#   S112   - try/except/continue is used to skip resources that are unavailable
+#            during collection (e.g. a repo without the requested branch).
+[lint]
+ignore = ["BLE001", "DTZ011", "S112"]
diff --git a/tests/fixtures/aws_audit_acme_2026-01-01/account_security.csv b/tests/fixtures/aws_audit_acme_2026-01-01/account_security.csv
new file mode 100644
index 0000000..47c36e5
--- /dev/null
+++ b/tests/fixtures/aws_audit_acme_2026-01-01/account_security.csv
@@ -0,0 +1,2 @@
+root_mfa_enabled,root_access_keys_present,root_signing_certs_present,mfa_devices,users,groups,roles,policies
+True,False,False,2,2,0,5,0
diff --git a/tests/fixtures/aws_audit_acme_2026-01-01/cloudtrail.csv b/tests/fixtures/aws_audit_acme_2026-01-01/cloudtrail.csv
new file mode 100644
index 0000000..fd1a395
--- /dev/null
+++ b/tests/fixtures/aws_audit_acme_2026-01-01/cloudtrail.csv
@@ -0,0 +1,2 @@
+name,home_region,multi_region,log_file_validation,is_logging,s3_bucket
+main,us-east-1,True,True,True,acme-logs
diff --git a/tests/fixtures/aws_audit_acme_2026-01-01/iam_users.csv b/tests/fixtures/aws_audit_acme_2026-01-01/iam_users.csv
new file mode 100644
index 0000000..e5fd6b7
--- /dev/null
+++ b/tests/fixtures/aws_audit_acme_2026-01-01/iam_users.csv
@@ -0,0 +1,3 @@
+user,mfa_enabled,access_keys,oldest_key_age_days,console_password,password_last_used,created
+alice,True,1,30,True,2025-12-01T00:00:00+00:00,2025-01-01T00:00:00+00:00
+bob,False,1,400,True,2025-11-01T00:00:00+00:00,2025-02-01T00:00:00+00:00
diff --git a/tests/fixtures/aws_audit_acme_2026-01-01/open_security_groups.csv b/tests/fixtures/aws_audit_acme_2026-01-01/open_security_groups.csv
new file mode 100644
index 0000000..0401af1
--- /dev/null
+++ b/tests/fixtures/aws_audit_acme_2026-01-01/open_security_groups.csv
@@ -0,0 +1,3 @@
+region,group_id,group_name,protocol,from_port,to_port,open_to
+us-east-1,sg-1,web,tcp,22,22,0.0.0.0/0
+us-east-1,sg-2,db,tcp,443,443,10.0.0.0/8
diff --git a/tests/fixtures/aws_audit_acme_2026-01-01/password_policy.csv b/tests/fixtures/aws_audit_acme_2026-01-01/password_policy.csv
new file mode 100644
index 0000000..b7529ca
--- /dev/null
+++ b/tests/fixtures/aws_audit_acme_2026-01-01/password_policy.csv
@@ -0,0 +1,2 @@
+minimum_length,require_symbols,require_numbers,require_uppercase,require_lowercase,allow_users_to_change,max_age_days,reuse_prevention,hard_expiry
+8,True,True,True,True,True,90,4,False
diff --git a/tests/fixtures/aws_audit_acme_2026-01-01/s3_public_access.csv b/tests/fixtures/aws_audit_acme_2026-01-01/s3_public_access.csv
new file mode 100644
index 0000000..e69de29
diff --git a/tests/fixtures/github_audit_acme_2026-01-01/branch_protections.csv b/tests/fixtures/github_audit_acme_2026-01-01/branch_protections.csv
new file mode 100644
index 0000000..00f9dae
--- /dev/null
+++ b/tests/fixtures/github_audit_acme_2026-01-01/branch_protections.csv
@@ -0,0 +1,3 @@
+repo,branch,protected,protection_source,required_reviews,dismiss_stale_reviews,require_code_owner_reviews,required_status_checks,enforce_admins,restrictions
+app,main,True,ruleset,1,True,False,,,
+site,main,False,,,,,,,
diff --git a/tests/fixtures/github_audit_acme_2026-01-01/org_security.csv b/tests/fixtures/github_audit_acme_2026-01-01/org_security.csv
new file mode 100644
index 0000000..5d9aed6
--- /dev/null
+++ b/tests/fixtures/github_audit_acme_2026-01-01/org_security.csv
@@ -0,0 +1,2 @@
+org,two_factor_required,default_repo_permission,members_can_create_repos,members_can_create_public_repos,members_can_create_pages,web_commit_signoff_required,advanced_security_for_new_repos,secret_scanning_for_new_repos,secret_scanning_push_protection_for_new_repos
+acme,True,read,True,True,True,False,True,True,True
diff --git a/tests/test_engine.py b/tests/test_engine.py
new file mode 100644
index 0000000..574104d
--- /dev/null
+++ b/tests/test_engine.py
@@ -0,0 +1,95 @@
+"""Tests for rule evaluation against fixture packages, using bundled rulesets."""
+
+from pathlib import Path
+
+from audit_report.engine import (
+    FAIL,
+    NOT_APPLICABLE,
+    PASS,
+    control_coverage,
+    evaluate,
+    summarize,
+)
+from audit_report.loader import load_package
+from audit_report.rules import load_ruleset
+
+FIXTURES = Path(__file__).parent / "fixtures"
+RULESETS = Path("audit_report/rulesets")
+
+
+def _run(pkg_name, ruleset_name):
+    pkg = load_package(FIXTURES / pkg_name)
+    ruleset = load_ruleset(RULESETS / ruleset_name)
+    findings = evaluate(pkg, ruleset)
+    return {f.rule.id: f for f in findings}
+
+
+def test_aws_fixture_findings():
+    findings = _run("aws_audit_acme_2026-01-01", "aws.yaml")
+
+    # bob has a console password and no MFA -> one failing row.
+    mfa = findings["aws.iam.console-mfa"]
+    assert mfa.status == FAIL
+    assert len(mfa.evidence) == 1
+    assert mfa.evidence[0]["user"] == "bob"
+
+    # bob's key is 400 days old.
+    assert findings["aws.iam.key-rotation"].status == FAIL
+
+    # Root is healthy in the fixture.
+    assert findings["aws.root.mfa"].status == PASS
+    assert findings["aws.root.no-access-keys"].status == PASS
+
+    # min length 8 < 14 -> policy fails.
+    assert findings["aws.iam.password-policy"].status == FAIL
+
+    # Only the port-22 group is open to the world.
+    ssh = findings["aws.network.no-open-ssh"]
+    assert ssh.status == FAIL
+    assert len(ssh.evidence) == 1
+    assert ssh.evidence[0]["group_name"] == "web"
+
+    # Empty s3_public_access table means no public buckets -> pass.
+    assert findings["aws.s3.no-public-access"].status == PASS
+
+    # A healthy multi-region trail exists.
+    assert findings["aws.cloudtrail.logging"].status == PASS
+
+
+def test_github_fixture_findings():
+    findings = _run("github_audit_acme_2026-01-01", "github.yaml")
+    assert findings["github.org.require-2fa"].status == PASS
+    assert findings["github.org.default-permission"].status == PASS
+    assert findings["github.org.secret-scanning"].status == PASS
+    # 'site' repo default branch is unprotected.
+    branch = findings["github.branch.default-protected"]
+    assert branch.status == FAIL
+    assert branch.evidence[0]["repo"] == "site"
+    # 'app' has 1 review, 'site' is unprotected -> require-reviews passes
+    # (only counts protected branches with < 1 review).
+    assert findings["github.branch.require-reviews"].status == PASS
+
+
+def test_not_applicable_when_table_absent(tmp_path):
+    (tmp_path / "aws_audit_x_2026-01-01").mkdir()
+    pkg_dir = tmp_path / "aws_audit_x_2026-01-01"
+    (pkg_dir / "iam_users.csv").write_text(
+        "user,mfa_enabled,console_password,oldest_key_age_days\n", encoding="utf-8"
+    )
+    pkg = load_package(pkg_dir)
+    findings = {f.rule.id: f for f in evaluate(pkg, load_ruleset(RULESETS / "aws.yaml"))}
+    # Tables that were never collected are reported as not applicable.
+    assert findings["aws.root.mfa"].status == NOT_APPLICABLE
+
+
+def test_summary_and_coverage():
+    pkg = load_package(FIXTURES / "aws_audit_acme_2026-01-01")
+    findings = evaluate(pkg, load_ruleset(RULESETS / "aws.yaml"))
+    counts = summarize(findings)
+    assert counts[FAIL] + counts[PASS] + counts[NOT_APPLICABLE] == len(findings)
+
+    coverage = control_coverage(findings)
+    # SC-7 is cited by the open-SSH rule (fails), so the control rolls up to fail.
+    assert coverage["NIST:SC-7"]["status"] == FAIL
+    # A control cited only by passing rules (both root checks) rolls up to pass.
+    assert coverage["ISO:A.8.2"]["status"] == PASS
diff --git a/tests/test_loader.py b/tests/test_loader.py
new file mode 100644
index 0000000..61b2db0
--- /dev/null
+++ b/tests/test_loader.py
@@ -0,0 +1,47 @@
+"""Tests for package loading and platform detection."""
+
+from pathlib import Path
+
+import pytest
+
+from audit_report.loader import detect_platform, load_package
+
+FIXTURES = Path(__file__).parent / "fixtures"
+
+
+@pytest.mark.parametrize(
+    ("dir_name", "platform", "subject"),
+    [
+        ("aws_audit_default_2026-07-29", "aws", "default"),
+        ("github_audit_audit-labs_2026-07-29", "github", "audit-labs"),
+        ("gitlab_audit_my_group_2026-01-01", "gitlab", "my_group"),
+        ("something_else", "unknown", "something_else"),
+    ],
+)
+def test_detect_platform(dir_name, platform, subject):
+    assert detect_platform(dir_name) == (platform, subject)
+
+
+def test_load_package_reads_tables():
+    pkg = load_package(FIXTURES / "aws_audit_acme_2026-01-01")
+    assert pkg.platform == "aws"
+    assert pkg.subject == "acme"
+    assert pkg.has("iam_users")
+    assert len(pkg.table("iam_users")) == 2
+    assert pkg.table("iam_users")[0]["user"] == "alice"
+    # Present-but-empty CSV is a known-empty table, not an absent one.
+    assert pkg.has("s3_public_access")
+    assert pkg.table("s3_public_access") == []
+    # Absent table returns empty list, reports as not present.
+    assert not pkg.has("nonexistent")
+    assert pkg.table("nonexistent") == []
+
+
+def test_load_missing_directory_raises():
+    with pytest.raises(FileNotFoundError):
+        load_package(FIXTURES / "does-not-exist")
+
+
+def test_load_directory_without_csvs_raises(tmp_path):
+    with pytest.raises(ValueError, match="no CSV files"):
+        load_package(tmp_path)
diff --git a/tests/test_reporters.py b/tests/test_reporters.py
new file mode 100644
index 0000000..f41bb43
--- /dev/null
+++ b/tests/test_reporters.py
@@ -0,0 +1,97 @@
+"""Tests for the report renderers and the CLI entry point."""
+
+import json
+from pathlib import Path
+
+import pytest
+
+from audit_report import reporters
+from audit_report.cli import main
+from audit_report.engine import evaluate
+from audit_report.loader import load_package
+from audit_report.rules import load_ruleset
+
+FIXTURES = Path(__file__).parent / "fixtures"
+RULESETS = Path("audit_report/rulesets")
+
+
+def _report(pkg_name="aws_audit_acme_2026-01-01", ruleset="aws.yaml"):
+    pkg = load_package(FIXTURES / pkg_name)
+    findings = evaluate(pkg, load_ruleset(RULESETS / ruleset))
+    return reporters.build_report(pkg, findings)
+
+
+def test_markdown_render_contains_sections():
+    md = reporters.render(_report(), "md")
+    assert "# Evidence Report — acme" in md
+    assert "## Control coverage" in md
+    assert "## Findings" in md
+    assert "aws.network.no-open-ssh" in md
+
+
+def test_html_render_is_self_contained():
+    html = reporters.render(_report(), "html")
+    assert html.startswith("<!doctype html>")
+    assert "<style>" in html
+    # No external resource references.
+    assert "http://" not in html and "https://" not in html
+    assert "src=" not in html
+
+
+def test_json_render_roundtrips():
+    data = json.loads(reporters.render(_report(), "json"))
+    assert data["platform"] == "aws"
+    assert data["subject"] == "acme"
+    ids = {f["id"]: f["status"] for f in data["findings"]}
+    assert ids["aws.iam.console-mfa"] == "fail"
+
+
+def test_html_escapes_evidence(tmp_path):
+    pkg_dir = tmp_path / "aws_audit_x_2026-01-01"
+    pkg_dir.mkdir()
+    (pkg_dir / "open_security_groups.csv").write_text(
+        "region,group_id,group_name,protocol,from_port,to_port,open_to\n"
+        "us-east-1,sg-1,<script>x</script>,tcp,22,22,0.0.0.0/0\n",
+        encoding="utf-8",
+    )
+    pkg = load_package(pkg_dir)
+    report = reporters.build_report(pkg, evaluate(pkg, load_ruleset(RULESETS / "aws.yaml")))
+    html = reporters.render(report, "html")
+    assert "<script>x</script>" not in html
+    assert "&lt;script&gt;" in html
+
+
+def test_unknown_format_raises():
+    with pytest.raises(ValueError, match="unknown format"):
+        reporters.render(_report(), "pdf")
+
+
+def test_cli_writes_files_and_exit_code(tmp_path):
+    out = tmp_path / "out"
+    code = main(
+        [
+            str(FIXTURES / "aws_audit_acme_2026-01-01"),
+            "--format",
+            "md,html,json",
+            "--out",
+            str(out),
+            "--fail-on",
+            "high",
+        ]
+    )
+    assert (out / "report.md").exists()
+    assert (out / "report.html").exists()
+    assert (out / "report.json").exists()
+    # The AWS fixture has high-severity failures (open SSH), so exit is non-zero.
+    assert code == 1
+
+
+def test_cli_fail_on_none_is_zero(tmp_path):
+    code = main(
+        [str(FIXTURES / "aws_audit_acme_2026-01-01"), "--format", "json", "--out", str(tmp_path)]
+    )
+    assert code == 0
+
+
+def test_cli_missing_package_returns_2():
+    assert main([str(FIXTURES / "nope")]) == 2
diff --git a/tests/test_rules.py b/tests/test_rules.py
new file mode 100644
index 0000000..76c2deb
--- /dev/null
+++ b/tests/test_rules.py
@@ -0,0 +1,52 @@
+"""Unit tests for the condition language in audit_report.rules."""
+
+import pytest
+
+from audit_report.rules import match
+
+
+@pytest.mark.parametrize(
+    ("condition", "row", "expected"),
+    [
+        ({"column": "x", "op": "equals", "value": "read"}, {"x": "read"}, True),
+        ({"column": "x", "op": "equals", "value": "Read"}, {"x": "read"}, True),  # case-insensitive
+        ({"column": "x", "op": "not_equals", "value": "read"}, {"x": "write"}, True),
+        ({"column": "x", "op": "is_true"}, {"x": "True"}, True),
+        ({"column": "x", "op": "is_true"}, {"x": "yes"}, True),
+        ({"column": "x", "op": "is_false"}, {"x": "False"}, True),
+        ({"column": "x", "op": "is_false"}, {"x": ""}, True),  # empty reads as false
+        ({"column": "x", "op": "gt", "value": 90}, {"x": "404"}, True),
+        ({"column": "x", "op": "gt", "value": 90}, {"x": "30"}, False),
+        ({"column": "x", "op": "lte", "value": 90}, {"x": "90"}, True),
+        ({"column": "x", "op": "gt", "value": 90}, {"x": ""}, False),  # non-numeric -> False
+        ({"column": "x", "op": "in", "value": ["read", "none"]}, {"x": "none"}, True),
+        ({"column": "x", "op": "not_in", "value": ["read", "none"]}, {"x": "admin"}, True),
+        ({"column": "x", "op": "empty"}, {"x": "  "}, True),
+        ({"column": "x", "op": "not_empty"}, {"x": "v"}, True),
+    ],
+)
+def test_leaf_conditions(condition, row, expected):
+    assert match(condition, row) is expected
+
+
+def test_boolean_combinators():
+    row = {"console_password": "True", "mfa_enabled": "False"}
+    cond = {
+        "all": [
+            {"column": "console_password", "op": "is_true"},
+            {"column": "mfa_enabled", "op": "is_false"},
+        ]
+    }
+    assert match(cond, row) is True
+    assert match({"any": [{"column": "mfa_enabled", "op": "is_true"}]}, row) is False
+    assert match({"not": {"column": "mfa_enabled", "op": "is_true"}}, row) is True
+
+
+def test_malformed_condition_raises():
+    with pytest.raises(ValueError, match="malformed condition"):
+        match({"value": "x"}, {"x": "y"})
+
+
+def test_unknown_operator_raises():
+    with pytest.raises(ValueError, match="unknown operator"):
+        match({"column": "x", "op": "wat"}, {"x": "y"})