# Redmine (slim)

> Redmine is open-source project management software for issues, projects, time tracking, wikis and Gantt charts, written in Ruby on Rails and run on the owner's own server. Agents reach it through a REST API in JSON or XML.

- Full: https://www.anchorterminal.com/tools/redmine.md (~6,850 tokens) · this version ~1,780 tokens · JSON https://www.anchorterminal.com/tools/redmine.json · canonical https://www.anchorterminal.com/tools/redmine
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

**D · 50.2/100 · rank #777 of 950 · #13 in Project & task management · not agent-ready · confidence medium**


Assessment: Redmine's REST API covers issues, projects, time entries and 20 other resources, and versions 6.1 and later add OAuth 2 with one scope per permission. The software is free under the GPL. No OpenAPI document exists, most errors return a bare status code, and 24 security advisories were published in twelve months, two rated critical.

## Facts

- Kind: HTTP API · vendor: Redmine project · category: Project & task management · legal entity: not named · provenance 25/100
- Local only (HTTP)
- Auth: OAuth or key · pricing: Free · x402: no · licence: GPL-2.0-or-later
- Probe metrics: not measured yet (probes haven't run)
- Surface graded: The REST API of a self-hosted Redmine 7.0.2 install, at the owner's own host. There is no vendor-run cloud. Hosting companies sell Redmine separately and are not graded here
- API: JSON or XML, chosen by a `.json` or `.xml` suffix. Issues, projects, memberships, users, time entries, news, issue relations, versions, wiki pages, queries, attachments, statuses, trackers, enumerations, categories, roles, groups, custom fields, search, files, my account and journals
- Authentication: API key in the `X-Redmine-API-Key` header, as the Basic auth user name or as a `key` query parameter. Login and password by Basic auth, refused when two-factor is active. OAuth 2 bearer tokens since 6.1
- OAuth: Authorisation code grant only, with refresh tokens. An administrator registers each application. Scopes are Redmine's permissions plus `admin`. Tokens and application secrets are stored hashed
- Impersonation: An administrator's call can act as another user with the `X-Redmine-Switch-User` header. An unknown login returns 412
- Pagination and sizing: `offset`, `limit` (default 25, maximum 100) and `page`. Lists return `total_count`. Related data such as journals, attachments and children arrive only when named in `include`. No field selection
- Filters: Issue lists filter by project, tracker, status, assignee, parent and custom field, with operators for dates and substrings, and sort by column
- Errors: 422 with an `errors` array of messages on validation failures. Other failures return a status code with an empty body. A wiki page update with a stale version returns 409
- Rate limits: None built in. No throttling library is in the Gemfile at 7.0.2, so limits are whatever the owner's web server applies
- Webhooks: Since 7.0, off by default. Events created, updated and deleted for issues, time entries, versions, wiki pages and news, limited to projects where the user holds the `use_webhooks` permission, with an optional secret that signs the payload
- Runtime: Redmine 7.0 runs on Ruby 3.2, 3.3, 3.4 or 4.0 with Rails 8.1, and PostgreSQL 14, MySQL 8.0 to 8.4, SQL Server or SQLite
- Releases: 7.0.2 and 6.1.5 on 30 September 2026, 7.0.1, 6.1.4 and 6.0.11 on 26 August, 7.0.0 on 30 June. Tarballs and zip files with SHA-256 sums on the download page
- Tests: 386 test files in the repository, 29 of them REST API integration tests. GitHub Actions runs them on four Ruby versions and three databases
- Prices: Redmine (self-hosted) free per seat per month

- Scores: Reliability 69, Performance pending, Schema & documentation 32, Agent ergonomics 51, Security & auth 51, Payments & pricing 60, Task success pending, Maintenance & community 73, Transparency & trust 47 · negative events -4 · total over the 7 assessed categories
- Why: Reliability, Graded on the REST API of a self-hosted install, with the local-software lines. · Schema & documentation, No OpenAPI document or other machine-readable contract was found in the wiki or the repository (0). · Agent ergonomics, Graded on the REST API. · Security & auth, OAuth 2 since 6.1 with the authorisation code grant, refresh tokens, hashed token storage and one scope per Redmine permission. · Payments & pricing, Read with the self-hosted rule. · Maintenance & community, Versions 7.0.2 and 6.1.5 were tagged on 30 September 2026 (30). · Transparency & trust, The source is public under the GPL, version 2 or later (30).
- Sources: 13, open questions: 11, both in the full twin
- Capabilities: tasks.create, tasks.update, projects.manage, tasks.comments, events.webhooks-send
- JSON: https://www.anchorterminal.com/api/v1/tools/redmine.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/redmine.svg` or a link to https://www.anchorterminal.com/tools/redmine from a page on redmine.org or one of its subdomains, or the README of github.com/redmine/redmine, then `POST https://www.anchorterminal.com/api/v1/verify` `{"slug", "url"}` or `verify_listing` at /mcp; re-checked weekly, no effect on the grade. Snippets in the full twin.

## Before you call it

1. Ask an administrator to tick Enable REST API under Administration, Settings, API. It is off by default and every call fails until then
2. Send the key in the `X-Redmine-API-Key` header, never as the `key` query parameter, and set `Content-Type: application/json` on every POST and PUT
3. Add `status_id=*` to issue lists. The default returns open issues only, 25 a page with a maximum of 100
4. Comment on an issue by sending `notes` in a PUT to `/issues/<id>.json`. There is no separate comment endpoint
5. A DELETE on a project through the API skips the confirmation the web page asks for, so run the agent as a non-administrator user

## Connect

```bash
curl -H "X-Redmine-API-Key: $API_KEY" https://$REDMINE_HOST/issues.json
```
Full config and headless snippets are in the full page. Through letme (picks today, calling later): https://letme.dev/redmine

## Similar tools

| Tool | Grade | Score | Shared capabilities | Slim |
| --- | --- | --- | --- | --- |
| Basecamp | B | 67.9 | tasks.create, tasks.update, projects.manage, tasks.comments, events.webhooks-send | https://www.anchorterminal.com/tools/basecamp.min.md |
| Plane | B | 67.6 | tasks.create, tasks.update, projects.manage, tasks.comments, events.webhooks-send | https://www.anchorterminal.com/tools/plane.min.md |
| OpenProject | C | 57.4 | tasks.create, tasks.update, projects.manage, tasks.comments, events.webhooks-send | https://www.anchorterminal.com/tools/openproject.min.md |
| Taiga | F | 31.7 | tasks.create, tasks.update, projects.manage, tasks.comments, events.webhooks-send | https://www.anchorterminal.com/tools/taiga.min.md |
| monday.com | BB | 76.4 | tasks.create, tasks.update, projects.manage, tasks.comments | https://www.anchorterminal.com/tools/monday.min.md |


## Panel reviews (0, desk reviews from public material, no calls made)