redmine-mcp-workflows 1.0.0

Schema-aware Model Context Protocol server for Redmine: validates workflow transitions, custom fields, and required fields against a per-tracker cache before round-tripping the API.

redmine-mcp-workflows

A schema-aware Model Context Protocol (MCP) server for Redmine.

Most MCP servers for Redmine are thin wrappers around the REST API: an LLM call goes through, Redmine returns 422 Unprocessable Entity, and the LLM has to guess what went wrong. redmine-mcp-workflows is different — it caches each tracker's workflow graph, custom field schemas, and role-based field permissions, then validates writes before they leave the client. When something can't succeed, you get a structured error with a clear next step instead of a stack trace.

What you get

81 tools, 410 tests, ruff clean. See docs/tool-catalog.md for the full list with parameters.

Discovery & introspection (4)

• redmine_describe_tracker(tracker) — required fields, allowed status transitions per role, custom field schemas. Cache-backed.
• redmine_describe_project(project) — enabled trackers, custom fields, members, default tracker.
• redmine_list_projects(query=None, limit=25, offset=0) — paginated.
• redmine_list_trackers() — all trackers + cache.

Cache control (1)

• redmine_invalidate_cache(scope) — "all", "tracker:<id>", or "project:<slug>".

Issue lifecycle (5) — every write validates against the cache

• redmine_create_issue(project, tracker, subject, ..., difficulty="")
• redmine_get_issue(id, include=...)
• redmine_update_issue(id, ..., difficulty="", **fields) — validates status transitions, custom fields, role permissions.
• redmine_close_issue(id, note=None) — convenience over update_issue with closure-specific error messaging.
• redmine_search_issues(query, project=None, status=None, ...)

Difficulty (engagement-mode signal, v0.4)

If your fleet has a global Difficulty custom field configured (values Unclassified / Easy / Normal / Hard), the difficulty parameter on redmine_create_issue and redmine_update_issue is the convenience path: pass difficulty="Easy" instead of constructing custom_fields=[{"id": <N>, "value": "Easy"}] manually. The field id is resolved via /custom_fields.json and cached.

• Create default-fills Unclassified when difficulty is omitted and no Difficulty entry is supplied in custom_fields — so auto-callers don't trip the required-field validation.
• Update does NOT default-fill (would silently overwrite user-set values).
• If both difficulty=... and a matching custom_fields entry are passed, difficulty wins.
• On fleets without a Difficulty field, the parameter silently no-ops.

Comments & attachments (4)

• redmine_add_comment(id, note, private=False)
• redmine_get_journals(id)
• redmine_upload_attachment(file_path, issue_id=None, description=None) — path-restricted to REDMINE_MCP_ALLOWED_DIRECTORIES.
• redmine_download_attachment(attachment_id, save_to, overwrite=False) — validates downloaded byte count against metadata filesize before writing (no partial-file corruption).

Time tracking (4) — v0.2

• redmine_create_time_entry(hours, issue_id=0, project_id=0, activity="", ...) — accepts H:MM or decimal hours; activity names resolve through the cached enumeration.
• redmine_list_time_entries(issue_id=0, project_id=0, user_id=0, spent_on="", from_date="", to_date="", ...)
• redmine_update_time_entry(id, hours="", activity="", ...) — partial; re-validates supplied hours.
• redmine_delete_time_entry(id) — permanent.

Watchers (3) — v0.2

• redmine_add_watcher(issue_id, user_id) — idempotent on the API side.
• redmine_remove_watcher(issue_id, user_id) — 404 surfaces verbatim so callers can distinguish "not a watcher" from "issue not found".
• redmine_list_watchers(issue_id)

Wiki page CRUD (4) — v0.2

• redmine_get_wiki_page(project, title, version=0) — optional historical version.
• redmine_create_wiki_page(project, title, text, parent_title="", comments="") — pre-flight GET refuses to overwrite.
• redmine_update_wiki_page(project, title, text, version=0, ...) — optional version for optimistic concurrency (mismatch → redmine_api_409).
• redmine_delete_wiki_page(project, title) — permanent.

Issue relations (4) — v0.2

• redmine_list_relations(issue_id)
• redmine_add_relation(issue_id, target_issue_id, relation_type, delay=0) — accepts colloquial related_to/blocked_by/duplicate_of aliases.
• redmine_remove_relation(relation_id) — DELETEs /relations/{id}.json (top-level URL).
• redmine_set_parent_issue(issue_id, parent_issue_id) — pass 0 to unparent.

Bulk operations (2) — v0.2

• redmine_bulk_update_issues(issue_ids, ...) — apply same field updates across many issues. ≤100 per batch.
• redmine_bulk_close(issue_ids, note="") — close many at once. Returns {total, succeeded, failed, skipped}. stop_on_error=True halts on first failure.

Versions / milestones (6) — v0.2

• redmine_list_versions(project)
• redmine_get_version(version_id)
• redmine_create_version(project, name, status="open"|"locked"|"closed", sharing="none"|"descendants"|...) — enums validated client-side.
• redmine_update_version(version_id, ...) — partial updates.
• redmine_delete_version(version_id) — 422 if issues still reference it.
• redmine_assign_issue_to_version(issue_id, version_id) — pass version_id=0 to clear.

Generic passthrough (1) — v0.3, opt-in

• redmine_request(method, path, body="", params="") — escape hatch to any Redmine REST endpoint. Gated behind REDMINE_MCP_ENABLE_PASSTHROUGH=true. Every response carries validation_skipped: true plus a warning field. NO validation, NO workflow check, NO schema cache. Use when no validated tool covers your use case; prefer the typed tools whenever possible.

News & forums (2) — v0.5

• redmine_list_news(project="", limit=25, offset=0) — paginated news feed. Empty project for the global feed; pass an id or slug for the per-project feed at /projects/{id}/news.json.
• redmine_list_messages(board_id, limit=25, offset=0) — forum messages on a specific board. A 404 typically means the boards module isn't enabled on the parent project.

Install

pip install redmine-mcp-workflows

Or for development:

git clone https://github.com/avicennasis/redmine-mcp-workflows
cd redmine-mcp-workflows
python3 -m venv .venv
.venv/bin/pip install -e .[dev]

Register with Claude Code

claude mcp add-json -s user redmine '{
  "command": "/path/to/.venv/bin/redmine-mcp",
  "env": {
    "REDMINE_URL": "https://redmine.example.com",
    "REDMINE_API_KEY": "your-api-key"
  }
}'

Or for Claude Desktop, add to claude_desktop_config.json:

{
  "mcpServers": {
    "redmine": {
      "command": "/path/to/.venv/bin/redmine-mcp",
      "env": {
        "REDMINE_URL": "https://redmine.example.com",
        "REDMINE_API_KEY": "your-api-key"
      }
    }
  }
}

Configuration

Variable	Default	Purpose
REDMINE_URL	http://127.0.0.1:8281	Redmine base URL. The default loopback is convenient for setups behind a reverse proxy that filters X-Redmine-API-Key.
REDMINE_API_KEY	(none)	API key.
REDMINE_OAUTH_TOKEN	(none)	OAuth2 bearer token (Doorkeeper, Redmine 6.1+). When set, sent as Authorization: Bearer <token> and takes precedence over the API key.
REDMINE_MCP_READ_ONLY	false	Set true to disable write tools.
REDMINE_MCP_CACHE_DIR	platform user-cache dir	Override for the SQLite cache location.
REDMINE_MCP_CACHE_TTL	86400 (24h)	Per-entry TTL in seconds.
REDMINE_HEADERS	(empty)	Extra HTTP headers, comma-separated (e.g., Authorization: Bearer ...).
REDMINE_MCP_ALLOWED_DIRECTORIES	/tmp	Comma-separated paths that redmine_upload_attachment may read from.
REDMINE_MCP_LOG_LEVEL	INFO	stdlib logging level.

Text formatting in notes

Redmine renders issue descriptions and journal notes using a text formatter — Markdown on most modern instances. This means **bold**, ## headings, | col | col | tables, and - list items all render correctly in note text.

Important for MCP callers: when composing multi-line notes, the note parameter must contain actual newline characters in the JSON string value. Do not use literal two-character \n escape sequences — they get double-escaped and stored as visible \n text instead of line breaks. If your notes look like a single paragraph with visible \n markers, this is the cause.

Correct (actual newlines in the JSON string):

{"note": "## Summary\n\nDone:\n- Fixed the auth bug\n- Updated tests"}

Wrong (literal backslash-n sequences — renders as one line with visible \n):

note = "## Summary\\nDone:\\n- Fixed the auth bug\\n- Updated tests"

How workflow validation works

When Claude calls redmine_update_issue(id=42, status="Closed"):

1. Server fetches issue 42's current state.

2. Looks up the workflow row (tracker_id, current_role, current_status, "Closed") in the schema cache.

3. If the transition isn't allowed, returns:

   {
     "error": "workflow_transition_disallowed",
     "tracker": "Bug",
     "from_status": "In Progress",
     "to_status": "Closed",
     "user_role": "Developer",
     "hint": "Workflow requires status to pass through 'Resolved' first.",
     "allowed_next_states": ["Resolved", "Reopened"]
   }
   

4. Otherwise sends the PUT.

Same pattern applies to custom fields (rejects unknown fields and regex/format violations) and required fields (rejects creates that miss required-and-empty fields).

Differences from other Redmine MCP servers

There are several others — most notably jztan/redmine-mcp-server (55 tools, comprehensive, no validation), @onozaty/redmine-mcp-server (TypeScript, Zod schemas), runekaagaard/mcp-redmine (generic OpenAPI passthrough). All are good projects.

redmine-mcp-workflows differs by validating before sending — 81 tools with a schema-aware validation layer that prefers helpful errors over raw API passthrough.

License

MIT — see LICENSE.

Contributing

See CONTRIBUTING.md for dev setup, testing conventions, and PR flow.