comet-ml--opik/CONTRIBUTING.md

# Contributing to Opik

Thanks for your interest in contributing to Opik.

If you are looking for setup instructions and contribution workflows, start with our docs:
- Contribution overview: https://www.comet.com/docs/opik/contributing/overview
- Local development setup: https://www.comet.com/docs/opik/contributing/guides/local-development

You can also read and edit those docs directly in this repository:
- `apps/opik-documentation/documentation/fern/docs/contributing/overview.mdx`
- `apps/opik-documentation/documentation/fern/docs/contributing/local-development.mdx`

Please review the CLA before contributing:
- https://github.com/comet-ml/opik/blob/main/CLA.md

## Repository layout at a glance
- `apps/`: deployable services and product surfaces (backend, frontend, docs, and supporting backends)
- `sdks/`: SDKs (`python`, `typescript`, `opik_optimizer`) and code generation
- `tests_end_to_end/`: end-to-end suites and helpers
- `deployment/`: Docker and Helm deployment assets

## Component-specific guides
- Backend:
  - Docs: https://www.comet.com/docs/opik/contributing/guides/backend
  - Source: `apps/opik-documentation/documentation/fern/docs/contributing/backend.mdx`
- Frontend:
  - Docs: https://www.comet.com/docs/opik/contributing/guides/frontend
  - Source: `apps/opik-documentation/documentation/fern/docs/contributing/frontend.mdx`
- Python SDK:
  - Docs: https://www.comet.com/docs/opik/contributing/guides/python-sdk
  - Source: `apps/opik-documentation/documentation/fern/docs/contributing/python-sdk.mdx`
- TypeScript SDK:
  - Docs: https://www.comet.com/docs/opik/contributing/guides/typescript-sdk
  - Source: `apps/opik-documentation/documentation/fern/docs/contributing/typescript-sdk.mdx`
- Documentation:
  - Docs: https://www.comet.com/docs/opik/contributing/guides/documentation
  - Source: `apps/opik-documentation/documentation/fern/docs/contributing/documentation.mdx`
- Agent Optimizer SDK:
  - Docs: https://www.comet.com/docs/opik/contributing/guides/agent-optimizer-sdk
  - Source: `apps/opik-documentation/documentation/fern/docs/contributing/agent-optimizer-sdk.mdx`

## Fast path
1. Open or confirm a tracked issue first (`Fixes #...` or `Resolves #...`).
2. Create a branch: `{username}/{ticket}-{summary}` where ticket is `OPIK-####`, `issue-####`, or `NA`.
3. Keep changes scoped to the requested area.
4. Run relevant formatters, linters, and tests before opening a PR.
5. Open a draft PR with GitHub CLI: `gh pr create --draft`.
6. Fill `.github/pull_request_template.md` completely.

## GitHub Actions workflows
Workflow files in `.github/workflows/` are validated with [actionlint](https://github.com/rhysd/actionlint), which runs as a hook in the unified `🐙 Code Quality` workflow (and locally via pre-commit) on changed workflow files. The pre-commit framework builds the pinned actionlint from source automatically — no manual install needed. Run `make hooks` once per clone to enable it locally.

## Dockerfiles
Dockerfiles are linted with [hadolint](https://github.com/hadolint/hadolint), which runs as a hook in the unified `🐙 Code Quality` workflow (and locally via pre-commit) on changed Dockerfiles. It uses hadolint's default rule set; the handful of intentionally-suppressed rules are annotated inline in each Dockerfile with a `# hadolint ignore=` comment and a reason. The hook runs hadolint via its Docker image, so it needs only Docker — no manual install. To run it directly on a single file: `docker run --rm -i ghcr.io/hadolint/hadolint < path/to/Dockerfile`.

## Generated files (do not edit manually)
- `apps/opik-backend/src/main/resources/model_prices_and_context_window.json`
- `apps/opik-frontend/src/data/model_prices_and_context_window.json`

These files are regenerated by automation from upstream `BerriAI/litellm`. Use the updater workflow or approved automation, not direct edits.

## Commit and PR conventions
- First commit (used as PR title source):
  - `[<TICKET-KEY>] [BE|FE|SDK|DOCS|INFRA|NA] <type>: <summary>`
- Follow-up commits:
  - `<type>(<scope>): <summary>` where type is one of `feat`, `fix`, `refactor`, `test`, `docs`, `chore`.
- Include screenshots/videos for user-facing UI changes.
- Keep customer names, non-public internal references, and sensitive operational context out of public PR text.

### Referencing Jira tickets in commit messages and the PR body
The GitHub for Jira app links a PR to a Jira ticket's Development panel whenever it finds an issue key (`OPIK-1234`, project key + hyphen + digits) in the branch name, PR title, PR body, or any commit message. It matches on the pattern alone — it can't tell "this PR resolves the ticket" from "this just mentions it" — and the link can't be removed afterward. To keep a ticket's Development panel reflecting only the work that actually touched it:
- Tickets this PR **resolves** → keep the hyphen: `OPIK-1234`. Jira links/URLs are fine and wanted. A PR may resolve more than one ticket — list all of them this way.
- Tickets **related but not resolved** in this PR (an escalation, a fix that references an older ticket — anything not in the PR title or branch) → replace the hyphen with an underscore (`OPIK_7000`) so the scanner can't match it, and do **not** paste a Jira URL for them (the URL contains the hyphenated key and links anyway).
- Branch name, PR title, and the `## Issues` section are unaffected — resolved tickets use normal `OPIK-1234` keys there.

This applies to new PRs only; once a stray key has linked a ticket it generally can't be un-linked.

## AI-assisted contributions
AI assistance is allowed, but human authors remain accountable for correctness, licensing, and security.

Rules:
- Always run relevant tests/linters for touched code.
- Always be explicit about human/users interaction with produced output.
- Always review prior issues, pull requests, and existing code for related solutions.
- Always address system-generated reviews (Baz, Greptile).
- Never submit unreviewed AI output.
- Never include secrets, tokens, private prompts, internal system instructions, or customer-sensitive data in generated/public content.
- Never disclose vulnerabilities, exploit steps, or incident details in public issues/PRs (use private maintainer/security channels).
- Include the PR template AI watermark/disclosure block when AI is used.

## Code quality (pre-commit)
Linters and formatters are orchestrated by the [pre-commit](https://pre-commit.com/) framework
from the single root `.pre-commit-config.yaml` (the source of truth for which checks run on which paths).

- Install once per clone: `pip install pre-commit` (or `brew install pre-commit`), then `make hooks`.
  Use pre-commit 3.0+ (developed on 4.x); the hook is shared across all worktrees, so install it once.
- On commit, only the hooks matching your changed files run. If a formatter fixes a file, the commit
  is aborted and the fixes are left **unstaged** — review them, `git add`, and commit again.
- Run the same checks over your whole branch diff: `make precommit`. Full-repo audit: `make precommit-all`.
- Java (Spotless), frontend/TS (ESLint + typecheck) hooks use the repo's own Maven/Node toolchains,
  so they only run for contributors already set up for those areas.

## Agent/editor setup
- Cursor compatibility: `make cursor` (`.cursor -> .agents`)
- Codex compatibility: `make codex` (`.codex -> .agents`, generates `AGENTS.override.md` from `.agents/rules/*.mdc`)
- Claude sync: `make claude` (syncs `.agents` to `.claude`)
- Git hooks: `make hooks` (installs the pre-commit framework hook; see Code quality above)