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cronmanager-mcp

cronmanager-mcp

by csoscd
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cronmanager-mcp

MCP (Model Context Protocol) server that exposes the Cronmanager REST API as conversational tools for LLM clients such as Claude Desktop or Claude Code.

Example prompts:

  • "Show me all failed jobs from the last 24 hours"

  • "Disable job 42"

  • "Create a maintenance window for Sunday night at 2 AM"

  • "Export all jobs tagged 'backup' as JSON"

Requirements

  • Cronmanager 4.1.0 or later (external REST API required)

  • An API key generated in the Cronmanager web UI (API Keys section)

Related MCP server: API to MCP

Quick start

docker run -d \
  -e CM_BASE_URL=https://cronmanager.example.com \
  -e CM_API_KEY=cm_your_api_key_here \
  -e MCP_AUTH_TOKEN=your_mcp_auth_token_here \
  -p 3000:3000 \
  cs1711/cronmanager-mcp:latest

Configure your MCP client to connect to http://your-host:3000/mcp with Bearer token MCP_AUTH_TOKEN.

For integration into an existing Cronmanager Docker Compose stack, see docker-compose.snippet.yml.

Configuration

All configuration is via environment variables.

Variable

Required

Default

Description

CM_BASE_URL

yes

—

Cronmanager web app base URL (no trailing slash)

CM_API_KEY

yes

—

Cronmanager API key (cm_…)

CM_AGENT_ID

no

—

Target a specific agent (sets X-Agent-Id header)

MCP_AUTH_TOKEN

yes

—

Bearer token protecting this MCP endpoint

PORT

no

3000

HTTP port

TIMEOUT_MS

no

10000

Cronmanager API request timeout in milliseconds

LOG_LEVEL

no

info

Log level: debug, info, warn, error

MCP_READONLY_MODE

no

false

When true, only read-only tools are registered

API key scopes

The API key must have the scopes matching the tools you intend to use:

Scope

Tools unlocked

jobs:read

list_jobs, get_job, get_job_history, get_timeline, list_tags

jobs:write

create_job, update_job, delete_job

jobs:execute

execute_job, kill_execution

export:read

export_jobs

maintenance:read

list_maintenance_windows, get_maintenance_window

maintenance:write

create_maintenance_window, update_maintenance_window, delete_maintenance_window

settings:read

get_settings, get_settings_section

settings:write

update_settings_section, resync_crontab

For read-only access, use the read-only profile (jobs:read, maintenance:read, export:read) and set MCP_READONLY_MODE=true.

Tools

Tool

Scope

Description

list_jobs

jobs:read

List cron jobs with optional filters

get_job

jobs:read

Get a single job by ID

create_job

jobs:write

Create a new cron job

update_job

jobs:write

Update a job (partial update; targets/tags are full-replaced)

delete_job

jobs:write

Delete a job

execute_job

jobs:execute

Trigger immediate one-time execution

kill_execution

jobs:execute

Kill a running execution

get_job_history

jobs:read

Execution history for a specific job

get_timeline

jobs:read

Cross-job execution timeline

list_tags

jobs:read

List all tags

export_jobs

export:read

Export jobs as JSON, CSV, or crontab text

list_maintenance_windows

maintenance:read

List maintenance windows

get_maintenance_window

maintenance:read

Get a single maintenance window

create_maintenance_window

maintenance:write

Create a maintenance window

update_maintenance_window

maintenance:write

Update a maintenance window

delete_maintenance_window

maintenance:write

Delete a maintenance window

get_settings

settings:read

Read all agent settings

get_settings_section

settings:read

Read one settings section

update_settings_section

settings:write

Update a settings section

resync_crontab

settings:write

Resync crontab from database

Note on update_job

If targets or tags are included in an update_job call, they fully replace the existing list — there is no merge. To add a single tag, first call get_job to read the current tags, then pass the complete updated array.

Endpoints

Endpoint

Description

POST /mcp

MCP Streamable HTTP endpoint (Bearer auth required)

GET /healthz

Liveness check (always 200, no auth required)

GET /readyz

Readiness check — pings Cronmanager API (no auth required)

Security

  • The MCP endpoint is protected by a Bearer token (MCP_AUTH_TOKEN), separate from the Cronmanager API key.

  • The Cronmanager API key (CM_API_KEY) is never exposed to MCP clients.

  • Bind to a specific interface or place behind a reverse proxy if the server should not be publicly accessible.

License

GNU General Public License version 3 or later

Tool Schema Changelog

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