MCP Health Monitor

health-monitor-mcp

MCP server, CI workflow, and generic HTTP endpoint monitoring with health history, TLS expiry, assertions, diagnostics, and operational reports.

[CI] [codecov] [Release] [License: MIT] [OpenSSF Scorecard] [Node.js]

What This Does

health-monitor-mcp keeps local registries of MCP servers, GitHub Actions workflows, GitLab pipelines, and generic HTTP endpoints. It performs live checks, records bounded evidence in SQLite, evaluates MCP alert thresholds, and returns JSON or Markdown diagnostics suitable for agents and operators.

Supported target transports:

• Streamable HTTP for current remote MCP servers.
• SSE for legacy MCP servers.
• stdio for trusted local executables after explicit opt-in.
• GitHub Actions workflow runs, failed jobs, and failed steps for public or private repositories.
• GitLab CI/CD pipelines, failed jobs, stages, refs, commits, URLs, and bounded trace excerpts for GitLab.com or allowlisted self-hosted instances.
• Generic HTTP/HTTPS endpoints with status, header, body-substring, JSON-value, redirect, latency, and TLS-expiry checks.

Azure DevOps monitoring was retired in v1.1.0. GitHub Actions shipped in v1.2.0 and GitLab CI/CD in v1.3.0; generic HTTP/TLS monitoring completes the current multi-provider feature line.

Quick Start

Run the published package noninteractively with Node.js 24:

npx -y health-monitor-mcp --version

Example MCP client configuration:

{  "mcpServers": {    "health-monitor": {      "command": "npx",      "args": ["-y", "health-monitor-mcp"]    }  }}

Tools

Expected configuration mistakes return stable error codes and remediation hints, including SERVER_NOT_FOUND, GITHUB_ACTIONS_TARGET_NOT_FOUND, GITLAB_PIPELINE_TARGET_NOT_FOUND, GITLAB_BASE_URL_NOT_ALLOWED, HTTP_TARGET_NOT_FOUND, HTTP_TARGET_URL_NOT_ALLOWED, NO_SERVERS_REGISTERED, STDIO_DISABLED, STDIO_COMMAND_REJECTED, WEBHOOK_ENCRYPTION_KEY_REQUIRED, WEBHOOK_REGISTRATION_FAILED, and WEBHOOK_NOT_FOUND.

Register Targets

Streamable HTTP:

register_server name="inventory-prod" type="http" url="https://inventory.example.com/mcp" tags=["production","inventory"]

Legacy SSE:

register_server name="legacy-search" type="sse" url="https://search.example.com/sse" tags=["legacy"]

Trusted local stdio:

export HEALTH_MONITOR_ALLOW_STDIO=1export HEALTH_MONITOR_STDIO_ALLOWLIST=npx,node

register_server name="local-debugger" type="stdio" command="npx" args=["-y","mcp-debug-recorder"] tags=["local"]

The command field must contain one executable only. Put package names and flags in args. Remote-safe runtime profiles always disable stdio.

Register GitHub Actions

Public repositories can be checked without authentication. Private repositories and higher API rate limits require a token with Actions read access:

export GITHUB_TOKEN=your-runtime-secret

register_github_actions name="repo-ci" owner="oaslananka" repository="health-monitor-mcp" workflow="ci.yml" branch="main" token_env="GITHUB_TOKEN" tags=["production","ci"]check_github_actions name="repo-ci" timeout_ms=5000

Only the environment-variable name in token_env is stored. The token value is read at check time and is never written to SQLite, logs, reports, or tool responses.

Register GitLab Pipelines

Public GitLab.com projects can be checked without authentication. Private projects require a token exposed only through the runtime environment:

export GITLAB_TOKEN=your-runtime-secret

register_gitlab_pipeline name="gitlab-ci" project="group/project" ref="main" token_env="GITLAB_TOKEN" tags=["production","ci"]check_gitlab_pipeline name="gitlab-ci" timeout_ms=5000

GitLab.com is allowed by default. A self-hosted instance must use an HTTPS origin and be explicitly allowed:

export HEALTH_MONITOR_GITLAB_BASE_URL_ALLOWLIST=https://gitlab.internal.example

register_gitlab_pipeline name="private-gitlab" base_url="https://gitlab.internal.example" project="platform/service" token_env="GITLAB_TOKEN"

Only token_env is persisted. Token values, response bodies, and full traces are never stored or returned. Failed-job trace excerpts are range-requested, sanitized, and bounded.

Register HTTP Targets

Public HTTP and HTTPS endpoints are allowed by default. The provider sends GET requests only and supports bounded status, header, body-substring, JSON scalar, and TLS-expiry assertions:

register_http_target name="service-health" url="https://status.example.com/health" expected_statuses=[200] header_assertions=[{"name":"x-ready","equals":"yes"}] body_contains=["ready"] json_assertions=[{"path":"status","equals":"ready"}] tls_expiry_days=30 tags=["production","http"]check_http_target name="service-health" timeout_ms=5000

Private, loopback, link-local, and other non-public addresses are blocked. A trusted private origin is available only in the full runtime profile and must be explicitly listed:

export HEALTH_MONITOR_HTTP_TARGET_ALLOWLIST=https://status.internal.example:8443

Every DNS answer and every redirect destination is revalidated. Responses are capped at 262144 bytes; full response bodies and certificate chains are never stored or returned.

Register Webhook Targets

Webhook targets receive alert notifications via HTTPS POST with optional HMAC-SHA256 signing. Secrets are encrypted at rest when HEALTH_MONITOR_WEBHOOK_ENCRYPTION_KEY is configured (32+ characters); otherwise secret registration is rejected.

register_webhook name="alert-webhook" url="https://hooks.example/alerts" secret="webhook-secret" events=["down","alert"] tags=["production","alerts"]test_webhook name="alert-webhook"

Secrets are never returned in listings or diagnostics—always redacted. Delivery diagnostics include status, latency, HTTP status code, and error message.

Health Checks and Reports

check_server name="inventory-prod" timeout_ms=5000check_all timeout_ms=5000 tags=["production"]get_uptime name="inventory-prod" hours=24get_dashboard hours=24 include_tool_stats=trueget_report hours=24

HEALTH_MONITOR_MAX_CONCURRENCY limits MCP, GitHub Actions, GitLab, and HTTP checks through one shared scheduled and interactive queue. Results preserve MCP-then-GitHub-then-GitLab-then-HTTP registration order even when checks complete out of order.

Alerts

set_alert name="inventory-prod" max_response_time_ms=500 min_uptime_percent=99 consecutive_failures_before_alert=2

Alert findings are evaluated by check_server, check_all, and get_dashboard. Configure webhook targets with register_webhook to receive alert notifications.

Configuration

HTTP Deployment

The server binds to 127.0.0.1 by default. A non-loopback bind requires a remote-safe profile, bearer token, and Origin allowlist.

HOST=0.0.0.0 \HEALTH_MONITOR_PROFILE=remote-safe \HEALTH_MONITOR_HTTP_TOKEN=change-me \HEALTH_MONITOR_HTTP_ORIGIN_ALLOWLIST=https://client.example \npx -y health-monitor-mcp-http

GET /health is unauthenticated and exposes only status and version. POST /mcp requires Authorization: Bearer <token>.

Docker

Persist /data; otherwise the SQLite database disappears with the container.

docker volume create health-monitor-data
docker run --rm \  -v health-monitor-data:/data \  -p 127.0.0.1:3000:3000 \  -e HOST=0.0.0.0 \  -e HEALTH_MONITOR_PROFILE=remote-safe \  -e HEALTH_MONITOR_HTTP_TOKEN=change-me \  -e HEALTH_MONITOR_HTTP_ORIGIN_ALLOWLIST=https://client.example \  ghcr.io/oaslananka/health-monitor-mcp:latest

Development

The repository pins Node.js 24.18.0 and pnpm 11.14.0 through .mise.toml.

mise trustmise installpnpm install --frozen-lockfilepnpm run ci

Useful gates:

pnpm run buildpnpm run typecheckpnpm run lintpnpm run lint:testpnpm run test:coveragepnpm run test:integrationpnpm run docs:api:checkpnpm run security:supply-chainpnpm run check:metadatapnpm run check:package

Coverage and Test Analytics

Jest remains the blocking coverage gate with repository-local thresholds. The CI validation job runs all unit and integration tests once, writes coverage/lcov.info and reports/junit/junit.xml, and uploads both reports to Codecov. Codecov project and patch statuses start as informational with target: auto and a 1% tolerance, adding pull-request diff coverage, file-level visibility, and failed-test analytics without duplicating the local merge gate.

Codecov Bundle Analysis is intentionally not enabled. This package ships Node.js entrypoints compiled with tsc; it does not currently produce a Rollup, Vite, or Webpack application bundle whose download size is a product metric.

Architecture and Roadmap

• Architecture
• Operations
• Security
• Usage
• Roadmap
• Release process
• Generated API reference

Agent Runtime Configuration

This repository owns its product-specific MCP configuration, plugin manifest, and skills:

Security and Contributing

Report vulnerabilities through GitHub Private Vulnerability Reporting. See SECURITY.md and docs/security.md.

Contribution setup and standards are documented in docs/contributing.md. Usage questions belong in GitHub Discussions; actionable work belongs in issues.

License

MIT