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AGENTS.md

Cursor Cloud specific instructions

Overview

This is a dual-repo Mattermost enterprise development environment:

Repository Location Purpose
mattermost/mattermost /workspace Primary monorepo (Go server + React webapp)
mattermost/enterprise $HOME/enterprise Private enterprise code (Go, linked via go.work)
mattermost/mattermost-plugin-agents $HOME/mattermost-plugin-agents AI plugin for validation/testing

PostgreSQL 14 is the only required external dependency, run via Docker Compose.

The update script handles: git auth, repo cloning, npm install, Go workspace setup, config.override.mk, and the client symlink. See below for what remains manual.

Localization/i18n

When editing translation strings, changes must ONLY be made to the relevant en.json. You MUST NOT change any other localization files.

Starting services

After the update script has run:

  1. Start Docker daemon (if not already running): sudo dockerd &>/tmp/dockerd.log & — wait a few seconds, verify with docker info.
  2. Start server + webapp together: 
    cd /workspace/server && \
  MM_LICENSE="$TEST_LICENSE" \
  MM_PLUGINSETTINGS_ENABLEUPLOADS=true \
  MM_PLUGINSETTINGS_ENABLE=true \
  MM_SERVICESETTINGS_SITEURL=http://localhost:8065 \
  make BUILD_ENTERPRISE_DIR="$HOME/enterprise" run
    This single command starts Docker (postgres), builds mmctl, sets up the go.work and client symlink, compiles the Go server with enterprise tags, runs it in the background, then starts the webpack watcher for the webapp. The server listens on :8065.
  3. Restart server after code changes: 
    cd /workspace/server && \
  MM_LICENSE="$TEST_LICENSE" \
  make BUILD_ENTERPRISE_DIR="$HOME/enterprise" restart-server
    This stops the running server and re-runs it with enterprise. Webapp changes are picked up by webpack automatically (browser refresh needed).

The TEST_LICENSE secret provides a Mattermost Enterprise Advanced license. When set via MM_LICENSE, the server logs "License key from ENV is valid, unlocking enterprise features." and the "TEAM EDITION" badge disappears from the UI.

You MUST pass BUILD_ENTERPRISE_DIR="$HOME/enterprise" to every make command — run, restart-server, run-server, test-server, check-style, etc. Without it, the Makefile defaults to ../../enterprise (which doesn't exist), and the build silently falls back to team edition.

Agents plugin configuration

The plugin is deployed from $HOME/mattermost-plugin-agents using:

cd $HOME/mattermost-plugin-agents && MM_SERVICESETTINGS_SITEURL=http://localhost:8065 make deploy

To configure a service and agent, patch the Mattermost config API. The ANTHROPIC_API_KEY environment variable must be set.

Critical gotcha: The config field under mattermost-ai must be a JSON object, not a JSON string. If stored as a string, the plugin logs LoadPluginConfiguration API failed to unmarshal.

Example config patch (use python to safely inject the API key from env):

import json, os
config = {
    "PluginSettings": {
        "Plugins": {
            "mattermost-ai": {
                "config": {  # MUST be an object, NOT json.dumps(...)
                    "services": [{
                        "id": "anthropic-svc-001",
                        "name": "Anthropic Claude",
                        "type": "anthropic",
                        "apiKey": os.environ["ANTHROPIC_API_KEY"],
                        "defaultModel": "claude-sonnet-4-6",
                        "tokenLimit": 200000,
                        "outputTokenLimit": 16000,
                        "streamingTimeoutSeconds": 300
                    }],
                    "bots": [{
                        "id": "claude-bot-001",
                        "name": "claude",
                        "displayName": "Claude Assistant",
                        "serviceID": "anthropic-svc-001",
                        "customInstructions": "You are a helpful AI assistant.",
                        "enableVision": True,
                        "disableTools": False,
                        "channelAccessLevel": 0,
                        "userAccessLevel": 0,
                        "reasoningEnabled": True,
                        "thinkingBudget": 1024
                    }],
                    "defaultBotName": "claude"
                }
            }
        }
    }
}
# Write to temp file, then: curl -X PUT http://localhost:8065/api/v4/config/patch -H "Authorization: Bearer $TOKEN" -d @file.json

Supported service types: openai, openaicompatible, azure, anthropic, asage, cohere, bedrock, mistral. The API key goes in services[].apiKey. Never log or print it.

Key gotchas

  • "TEAM EDITION" means no license, not no enterprise code. The webapp shows "TEAM EDITION" when license.IsLicensed === 'false', regardless of BuildEnterpriseReady. Fix: pass MM_LICENSE="$TEST_LICENSE" when starting the server. To verify enterprise code is loaded independently: check server logs for "Enterprise Build", enterprise_build: true or the API at /api/v4/config/client?format=old for BuildEnterpriseReady: true.
  • The server auto-generates server/config/config.json on first run; default SQL points to postgres://mmuser:mostest@localhost/mattermost_test matching Docker Compose.
  • The first user created via /api/v4/users gets system_admin role automatically.
  • SMTP errors and plugin directory warnings on startup are expected in dev — non-blocking.
  • License errors in logs ("Failed to read license set in environment") are normal — enterprise features requiring a license won't be available but the server runs fine.
  • The enterprise repo must be on a compatible branch with the main repo.
  • The VM's global gitconfig may have url.*.insteadOf rules embedding the default Cursor agent token, which only has access to mattermost/mattermost. The update script cleans these and sets up gh auth with CURSOR_GH_TOKEN instead.

Lint, test, and build

Server (with enterprise): all commands from /workspace/server/, always include BUILD_ENTERPRISE_DIR="$HOME/enterprise":

  • Run: make BUILD_ENTERPRISE_DIR="$HOME/enterprise" run
  • Restart: make BUILD_ENTERPRISE_DIR="$HOME/enterprise" restart-server
  • Lint: make BUILD_ENTERPRISE_DIR="$HOME/enterprise" check-style
  • Tests: make BUILD_ENTERPRISE_DIR="$HOME/enterprise" test-server (needs Docker). Quick: go test ./public/model/...
  • Standalone build: make BUILD_ENTERPRISE_DIR="$HOME/enterprise" build-linux (or use go build -tags 'enterprise sourceavailable' ... directly)

Webapp: run from /workspace/webapp/

  • Lint: npm run check
  • Tests: npm run test (Jest 30)
  • Type check: npm run check-types
  • Build: npm run build

Browser automation

agent-browser (Vercel) is installed globally. It provides a higher-level CLI for browser automation — navigation, clicking, typing, screenshots, accessibility snapshots, and visual diffs. Usage: agent-browser <command>. See the agent-browser skill for more information.

Versions

  • Node.js: see .nvmrc; nvm use from workspace root.
  • Go: see server/go.mod.