# ActVer > GitHub Actions version lookup — REST API, MCP server, and web UI. ActVer provides the latest version, commit SHA, and prerelease info for any GitHub Action. Use it to pin actions to SHAs, upgrade to the latest versions, or audit your CI/CD workflows. ## API Base URL: `https://actver.dev` - GET /v1/actions/{owner}/{repo} — Get latest version and SHA - GET /v1/actions/{owner}/{repo}/versions — List all major versions - GET /v1/health — Service health check ## MCP Server Endpoint: `https://actver.dev/mcp` (StreamableHTTP, POST only) Tools: - get_action_version — Get latest version, SHA, and prerelease info - list_action_versions — List all major versions with SHAs ## Plugin ```bash claude plugin install actver-dev/skills ``` ## Links - Web UI: https://actver.dev - Full documentation for LLMs: https://actver.dev/llms-full.txt - GitHub: https://github.com/actver-dev