claude-code-action/docs/forgejo.md

Forgejo Platform Support

This action supports Forgejo (and Forgejo Actions) as an alternative to GitHub. The same action code runs on both platforms — platform detection is automatic or explicitly configured.

Prerequisites

• Forgejo instance with Forgejo Actions enabled
• Forgejo runner registered and operational (e.g., a grunt or ubuntu-latest runner)
• Anthropic API key or Claude Code OAuth token for Claude API access
• Forgejo token with repo access (automatically available as github.token in workflows, or use a dedicated bot user)

Quick Start

1. Add Secrets

Add secrets at the organization level (Settings > Actions > Secrets) so all repos can share them:

• ANTHROPIC_API_KEY — Your Anthropic API key (starting with sk-ant-)
• CLAUDE_BOT_TOKEN — API token for the dedicated bot user (see Dedicated Bot User below)

2. Create Workflow

Create .forgejo/workflows/claude.yml:

name: Claude Assistant
on:
  issue_comment:
    types: [created]
  pull_request_review_comment:
    types: [created]
  issues:
    types: [opened, assigned, labeled]
  pull_request_review:
    types: [submitted]

jobs:
  claude-response:
    runs-on: grunt # Your Forgejo runner label
    steps:
      - uses: https://git.wxs.ro/actions/claude-code-action@v1 # Or your mirror URL
        with:
          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
          platform: "forgejo"
          github_token: ${{ secrets.CLAUDE_BOT_TOKEN }}
          bot_id: "YOUR_BOT_ID" # Replace with your bot's Forgejo user ID (see step 5 below)
          bot_name: "claude"
          bot_email: "claude@yourdomain.com" # Must match the bot user's registered email

3. Agent Mode (Automation)

For automation workflows triggered by workflow_dispatch, push events, or schedules:

name: Claude Automation
on:
  workflow_dispatch:
    inputs:
      task:
        description: "Task for Claude"
        required: true

jobs:
  run-claude:
    runs-on: grunt
    steps:
      - uses: https://git.wxs.ro/actions/claude-code-action@v1
        with:
          prompt: ${{ github.event.inputs.task }}
          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
          platform: "forgejo"
          github_token: ${{ secrets.CLAUDE_BOT_TOKEN }}
          bot_id: "YOUR_BOT_ID" # Replace with your bot's Forgejo user ID
          bot_name: "claude"
          bot_email: "claude@yourdomain.com"

Platform Detection

The action detects the platform using a three-tier strategy:

Priority	Method	Details
1	Explicit input	platform: "forgejo" in workflow — most reliable
2	FORGEJO env var	Set to "true" by Forgejo runner v7.0+
3	GITHUB_SERVER_URL heuristic	If the URL doesn't contain github.com, assumes Forgejo

Recommendation: Always set platform: "forgejo" explicitly. Auto-detection works but the explicit input eliminates ambiguity.

Differences from GitHub

Authentication

Aspect	GitHub	Forgejo
Default auth	GitHub App OIDC token exchange	Direct GITHUB_TOKEN / FORGEJO_TOKEN
Token setup	Automatic via Claude GitHub App	Manual — provide github_token input
App token revocation	Automatic cleanup step	Skipped (no app token)
Bot identity	claude[bot] (ID: 41898282)	Dedicated bot user via bot_id/bot_name/bot_email inputs

On Forgejo, there is no OIDC token exchange with Anthropic. The action uses the workflow token (github.token) or a user-provided github_token directly.

API Differences

Feature	GitHub	Forgejo
GraphQL API	Used for PR/issue data fetching	Not available — REST API only
Data fetching	Single GraphQL query per entity	5-8 parallel REST API calls
Actor validation	Checks for bot/app accounts	Skipped — no bot accounts on Forgejo
GitHub MCP server	ghcr.io/github/github-mcp-server included	Skipped — GitHub-specific
CI/Actions MCP	Full GitHub Actions API	Works via Octokit REST + GITHUB_API_URL
Permission check	getCollaboratorPermissionLevel()	repos.get() fallback (workflow tokens lack collaborator endpoint)
Git ref lookup	git.getRef() (/git/ref/heads/...)	repos.getBranch() (/git/refs is plural on Forgejo)

Webhook & Event Differences

Forgejo's webhook payloads and event naming diverge from GitHub in several ways. These are handled automatically by the action but important to understand when debugging:

Behavior	GitHub	Forgejo
PR review comment event name	pull_request_review_comment	pull_request_comment (same event for both review comments and reviews)
PR review event name	pull_request_review	pull_request_comment (merged with review comments)
Issue label event action	labeled	label_updated (normalized by FORGEJO_EVENT_ACTION_MAP in context.ts)
Issue assigned event action	assigned	assigned (matches GitHub — no normalization needed)
Review comment payload	Top-level comment object present	No top-level comment — tracking comment falls back to issue comment
Assigned payload	Top-level assignee object present	No top-level assignee — must read from issue.assignee
PR compare URL parameter	quick_pull=1	expand=1
Workflow if: body fields	github.event.comment.body populated	Not populated for pull_request_comment events
Workflow if: action field	github.event.action populated for issues events	Not populated — if: cannot gate on action
Workflow if: expression parser	Allows # comments	Rejects # as invalid token — comments must go outside if: block
Creating issue with label	Fires opened only	Fires both opened and label_updated as separate events
Assignees API	PATCH /issues/{id} with {"assignees": [...]} (array)	Array form returns 404 — must use singular {"assignee": "user"}

Practical impact: The @claude mention check and event action validation happen in application code (trigger.ts, context.ts) rather than the workflow if: condition. The workflow lets all events through and the action decides what to act on.

Bun Installation

The upstream action uses oven-sh/setup-bun. On Forgejo, this is replaced with a universal curl install because Forgejo runners pre-fetch all uses: action references before evaluating if: conditions, causing failures for GitHub-hosted actions that aren't mirrored.

Comment URLs

Comment tracking URLs (job links, branch links, PR creation links) use Forgejo URL patterns instead of GitHub patterns. This is handled automatically.

Action Inputs

The platform input is the only Forgejo-specific addition:

platform:
  description: "Platform to run on: 'auto' (default auto-detects), 'github', or 'forgejo'"
  required: false
  default: "auto"

All other inputs work identically on both platforms. See the Usage Guide for the full list.

Dedicated Bot User (Recommended)

On GitHub, Claude gets its own identity via the GitHub App (claude[bot]). On Forgejo, there's no such mechanism — by default the action runs under whatever token you provide, meaning commits and comments appear as the human user.

Creating a dedicated bot user solves this:

• Clear attribution: Commits and comments show as claude, not your personal account
• Least privilege: The bot token has only the permissions Claude needs
• Audit trail: Easy to distinguish human actions from bot actions in repo history
• Security: If the action is compromised, only the bot's scoped token is exposed

Setup Steps

1. Create the bot user

Go to Site Administration > User Accounts > Create User Account or use the admin API:

• Username: claude
• Email: e.g., claude@yourdomain.com
• Password: any strong password (you'll use API tokens, not password login)
• Uncheck "Require user to change password"
• Leave "Admin" unchecked
• Optionally set a display name and avatar to distinguish from human users

2. Add to organizations via teams

For each organization where Claude should operate:

1. Go to Org Settings > Teams > New Team
2. Create a team named Claude with:
   • Permission: Write
   • Access: All Repositories (so new repos are automatically covered)
3. Add claude to the team's Members

3. Generate a scoped API token

Log in as claude, go to Settings > Applications, and create a token:

• Token Name: claude-code-action
• Scopes:
  • repo — read/write (issues, PRs, comments, branches, commits)
  • user:read — needed for API identity
  • Leave admin, organization, package unchecked

4. Store the token as an org-level secret

Add the token as CLAUDE_BOT_TOKEN at the organization level (Settings > Actions > Secrets) with visibility set to "All repositories". This way all repos in the org share the same secret.

5. Get the bot user's ID

You'll need the Forgejo user ID for the bot_id input:

curl -s "https://your-forgejo-instance/api/v1/users/claude" | jq '.id'

6. Configure the workflow

- uses: https://git.wxs.ro/actions/claude-code-action@v1
  with:
    anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
    platform: "forgejo"
    github_token: ${{ secrets.CLAUDE_BOT_TOKEN }}
    bot_id: "YOUR_BOT_ID" # Replace with the ID from step 5
    bot_name: "claude"
    bot_email: "claude@yourdomain.com" # Must match the bot user's registered email

The bot_email input overrides the default noreply email format. When it matches the bot user's registered email in Forgejo, commits will be linked to the bot's profile in the UI.

Token Rotation

Forgejo API tokens can expire. Plan for rotation:

1. Set a calendar reminder for before the token expires
2. Generate a new token by logging in as claude (same scopes as above)
3. Update the org secret CLAUDE_BOT_TOKEN with the new token value
4. No code changes needed — the workflow reads the secret at runtime

Alternatively, generate a token without an expiration date (if your Forgejo instance allows it).

Included CI Workflows

This fork includes four Forgejo-native workflows in .forgejo/workflows/:

claude.yml — Tag Mode (@claude Mentions)

Responds to @claude mentions on issues, PR review comments, and PR reviews. Also triggers on issue assignment and label events. This is the main interactive workflow for using Claude on Forgejo.

ci.yml — Tests, Formatting, Type Checking

Runs on push to main and pull requests. Three parallel jobs:

• test — bun test (with GITHUB_SERVER_URL override so GitHub-context unit tests pass)
• prettier — bun run format:check
• typecheck — bun run typecheck

test-action.yml — Action Self-Test

Tests the action itself on Forgejo in agent mode. Runs weekly and on PRs that modify src/, action.yml, or .forgejo/. Validates:

• Platform detection returns "forgejo"
• Token authentication works
• Claude Code executes successfully
• Output file is produced

upstream-sync.yml — Upstream Sync Check

Runs weekly. Compares main with upstream/main (anthropics/claude-code-action). If upstream has new commits:

• Creates or updates an issue with the upstream-sync label
• Includes commit log, diff stats, and merge instructions
• Lists conflict-prone files

Merging Upstream Changes

This fork is designed for easy upstream merges. Only 4-5 files have Forgejo-specific modifications, and changes are placed at function entry points using an early-return pattern.

Merge Process

# Fetch latest upstream
git fetch upstream main

# Merge into your main branch
git merge upstream/main

# If conflicts occur, they'll be in these files:
#   - src/entrypoints/run.ts (platform branch at top)
#   - src/modes/tag/index.ts (data fetcher swap)
#   - src/mcp/install-mcp-server.ts (platform routing)
#   - action.yml (platform input, bun install)

# Resolve conflicts, keeping both the upstream changes and
# the Forgejo platform branches at function entry points

# Run tests to verify
bun test

# Push
git push origin main

Conflict Mitigation

All Forgejo changes follow the early-return pattern — platform-specific logic is placed at the top of functions, before the existing GitHub code. This means:

• Upstream changes to the GitHub code path rarely conflict with Forgejo additions
• When conflicts do occur, they're localized to the few lines where the platform branch starts
• Resolution is straightforward: keep both the platform check and the upstream changes

What Happens When Upstream Adds New Features

New upstream features that use GraphQL or GitHub-specific APIs won't automatically work on Forgejo. The Forgejo data fetcher (src/forgejo/data/fetcher.ts) would need REST equivalents added. The action will still run — features that depend on missing data will simply lack that context.

E2E Test Results

All execution modes and trigger types have been validated end-to-end on a Forgejo instance (git.wxs.ro):

Mode	Trigger	Status	Details
Agent mode	workflow_dispatch	Validated	Platform detection, token auth, Claude execution, output file — all green
Tag mode	issue_comment (@claude)	Validated	Issue context (title + body) read correctly, platform detected as forgejo, tracking comment created with spinner then updated with response (31s), job link URL correct
Tag mode	pull_request_review_comment	Validated	PR diff and review comment body visible to Claude. Tracking comment created as issue comment (not review reply — see webhook quirks below). 3 bugs fixed: missing top-level comment in payload, event name mismatch, MCP comment routing
Tag mode	pull_request_review	Validated	Claude responds to @claude in PR review body. Forgejo sends pull_request_comment instead of pull_request_review — the @claude check runs in trigger.ts, not the workflow if: condition
Tag mode	issues with labeled action	Validated	Claude responds when the configured label is applied. 3 bugs fixed: workflow if: expression parser rejects # comments, github.event.action not populated in if: context, event action is label_updated not labeled
Tag mode	issues with assigned action	Validated	Claude responds when assigned to an issue. 1 bug fixed: assignee field missing from top-level payload (nested under issue.assignee instead)
Tag mode	Code changes (branch + commits)	Validated	Claude creates branch, pushes commits, links branch in tracking comment. Bot identity (claude <claude@wxs.ro>) correct. PR compare URL uses expand=1 (Forgejo) instead of quick_pull=1 (GitHub)

Tag Mode Verified Capabilities

• @claude trigger phrase detected in issue comments, PR review comments, and PR reviews
• Issue body, title, PR diff, and review comment body fully visible to Claude
• Tracking comment created with progress spinner, then updated with final response
• Forgejo job run URL correctly formatted in tracking comment
• Branch creation works via repos.getBranch() API (Forgejo uses /git/refs not /git/ref)
• Permission check passes via repos.get() fallback
• Label trigger fires when configured label is applied to an issue
• Assignee trigger fires when the bot user is assigned to an issue
• Code changes: branch creation, file commits, and PR compare URL all work correctly
• Bot identity (commits attributed to claude user) verified via git log and API

Known Limitations

• Git ref API: Forgejo uses /git/refs (plural) instead of GitHub's /git/ref (singular). The action handles this by using repos.getBranch() on Forgejo for branch SHA lookups.
• User display name fetch: GET /users/{username} returns 403 without read:user scope. Non-fatal — falls back to login name.
• pull_request_target event: May not exist in Forgejo. The action degrades gracefully (maps to pull_request).
• GitHub MCP server: The ghcr.io/github/github-mcp-server Docker image is GitHub-specific and is skipped on Forgejo.
• Commit signing: SSH signing has not been tested on Forgejo. The use_commit_signing option (GitHub API signing) won't work since it uses GitHub's commit API.
• downloadJobLogForWorkflowRun: Forgejo's Actions API may lack this endpoint. The CI MCP server attempts it via Octokit REST but may return limited data.
• Bot filtering: allowed_bots checks won't match claude[bot] since Forgejo has no bot accounts. Actor validation is skipped entirely on Forgejo.
• pull_request_review trigger is dead code: Forgejo sends pull_request_comment for both review comments and review submissions. The pull_request_review trigger in the workflow never fires — all review-related events are handled through the pull_request_comment codepath.
• Review comment tracking comments are always issue comments: On Forgejo, review comment events lack the top-level comment object needed to create PR review comment replies. The tracking comment is always created as a regular issue comment instead.
• Workflow if: conditions are unreliable for Forgejo events: Forgejo does not populate github.event.comment.body, github.event.review.body, or github.event.action in the workflow expression context for several event types. All trigger validation happens in application code (trigger.ts), not in workflow conditions.
• Assignees API (plural array form): PATCH /repos/{owner}/{repo}/issues/{index} with {"assignees": ["user"]} returns 404 on Forgejo. Use the deprecated singular {"assignee": "user"} field instead.

Troubleshooting

"Resource not accessible by integration" errors

This usually means the token lacks permissions. On Forgejo:

• Use a personal access token with repo scope via the github_token input
• The default github.token in Forgejo workflows may have limited permissions depending on your runner configuration

Tests fail with platform detection errors

Unit tests assume GitHub context by default. When running on a Forgejo runner, set GITHUB_SERVER_URL=https://github.com before running tests (the CI workflow handles this automatically).

Bun installation fails

If curl -fsSL https://bun.sh/install | bash fails on your runner, pre-install Bun on the runner image or use the path_to_bun_executable input to point to a custom Bun binary.

Claude's tracking comment doesn't appear as a review reply

On Forgejo, review comment triggers (pull_request_review_comment) always create a regular issue comment — not a reply in the review thread. This is because Forgejo's webhook payload lacks the top-level comment object needed to create a review reply. The response still appears on the PR, just as a standalone comment.

Workflow if: condition skips events it shouldn't

Forgejo doesn't populate github.event.comment.body, github.event.review.body, or github.event.action in the workflow expression context for pull_request_comment and issues events. If your workflow if: condition checks these fields, events will be silently skipped. The fix is to let all events through and handle validation in trigger.ts instead.

Workflow if: expression fails with "invalid token" error

Forgejo's expression parser rejects # characters as invalid tokens. Move any comments outside the if: block and use >- scalar folding instead of | for multi-line expressions.

Label trigger fires twice when creating issue with label

If you create an issue with a label in one operation, Forgejo fires both opened and label_updated as separate events. The action handles this correctly — it only checks labels on label_updated events, not on opened.

mock.module() breaks tests on Forgejo CI (Linux Bun)

Bun's mock.module() replaces the module globally in the process module registry. With Bun's non-deterministic test file ordering on Linux, this causes cross-file pollution: one test file's mock leaks into another. Use dependency injection or spyOn on individual functions instead. If the real function is safe to call (e.g., returns empty results for test data), avoid mocking entirely.

Upstream workflows run and fail

If .github/workflows/ from upstream are executing on your Forgejo runner, configure the runner to only read from .forgejo/workflows/. This is a runner-level setting — see your Forgejo instance's runner configuration.