PromptProof GitHub Action

Deterministic LLM testing in your CI/CD pipeline. This action evaluates recorded LLM outputs against defined contracts and fails PRs when violations are detected.

Features

• 🔒 Zero network calls - Tests run on recorded fixtures
• 📊 Rich reporting - HTML, JUnit, JSON output formats
• 💬 PR comments - Automatic violation summaries
• 📈 Budget tracking - Cost and latency monitoring
• 🎯 Flexible checks - JSON schema, regex, numeric bounds, string contains/equals, list/set equality, file diff, custom functions

See it in action

• Regression fail PR · Cost gate PR · Assertion fail PR

  [Links to live PRs and GIFs to be inserted after publishing]

Report preview

Below are example screenshots of the HTML report generated by this action.

Before

After

Quick Start

name: PromptProof
on: [pull_request]

jobs:
  eval:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: geminimir/promptproof-action@v0
        with:
          config: promptproof.yaml
          baseline-ref: origin/main
          runs: 3
          seed: 1337
          max-run-cost: 2.50
          report-artifact: promptproof-report
          mode: gate

Inputs

Input	Description	Default
config	Path to promptproof.yaml	promptproof.yaml
baseline-ref	Git ref to load baseline snapshot from (e.g., origin/main)
runs	Number of runs for flake control
seed	Seed for flake control determinism
max-run-cost	Maximum total cost for this run (USD)
report-artifact	Name of uploaded report artifact	promptproof-report
mode	gate (fail) or report-only (warn). Defaults to config.
format	Output format (html	junit
regress	Also compare to local baseline	false
node-version	Node.js version	20
snapshot-on-success	Create snapshot after successful run	false
snapshot-promote-on-main	Promote snapshot to baseline on main	false
snapshot-tag	Optional snapshot tag

Outputs

Output	Description
violations	Number of violations found
passed	Number of fixtures that passed
failed	Number of fixtures that failed
failed-tests	Alias for failed
total-cost	Total cost (USD) of this evaluation
regressions	New failures vs baseline (when regression comparison is enabled)
report-path	Path to generated report

Configuration

Create a promptproof.yaml file in your repository:

schema_version: pp.v1
fixtures: fixtures/outputs.jsonl
checks:
  - id: no_pii
    type: regex_forbidden
    target: text
    patterns:
      - "[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,}"
budgets:
  cost_usd_per_run_max: 0.50
  latency_ms_p95_max: 2000
mode: fail

Examples

Advanced usage (baseline/regress + flake control + cost gate)

- uses: geminimir/promptproof-action@v0
  with:
    config: promptproof.yaml
    baseline-ref: origin/main   # pull last green snapshot from main
    regress: true               # also compare with any local baseline
    runs: 5                     # flake control
    seed: 42                    # deterministic nondeterminism
    max-run-cost: 1.75          # cost gate for the entire suite
    format: junit               # emit JUnit XML for test tab
    mode: gate                  # fail on violations

Gate on cost via branch rules (report-only mode)

- uses: geminimir/promptproof-action@v0
  with:
    config: promptproof.yaml
    max-run-cost: 1.00
    mode: report-only           # never fail directly

Then in Branch protection, require the "PromptProof" check so the PR is blocked when the budget is exceeded.

Custom Output Format

- uses: geminimir/promptproof-action@v0
  with:
    config: promptproof.yaml
    format: junit
    report-artifact: promptproof-report
    snapshot-on-success: true
    snapshot-promote-on-main: true
    snapshot-tag: nightly

Zero-network Quickstart (fixtures only)

No API keys required. Use sample fixtures to see a green run:

name: PromptProof
on: [pull_request]
jobs:
  eval:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: geminimir/promptproof-action@v0
        with:
          config: example/promptproof.yaml
          format: html
          mode: report-only

This uses recorded fixtures under example/fixtures/ so CI makes no network calls.

Make it a required check

1. Settings → Branches → Branch protection rules → Add rule
2. Branch name pattern = main
3. Enable "Require status checks to pass" → select "PromptProof"
4. Save

With Matrix Testing

strategy:
  matrix:
    suite: [support, sales, docs]
steps:
  - uses: geminimir/promptproof-action@v0
    with:
      config: promptproof-${{ matrix.suite }}.yaml

PR Comments

The action automatically comments on PRs with:

• Violation summary grouped by check type
• Key metrics (cost, latency, pass/fail counts)
• Expandable details for each violation type

Artifacts

Reports are uploaded as artifacts and retained for 30 days:

• HTML report for human review
• JSON report for programmatic access
• JUnit XML for test result visualization

License

MIT