Lastseen

mcp-name: dev.lastseen/mortality

last seen data: CC-BY-4.0 code: MIT

Is this dependency dead? Dated observations of whether an npm package, GitHub Action, MCP server, or Docker image is alive, dormant, abandoned, archived, or deleted — published by lastseen.dev. Free, no API key, zero telemetry.

There are two ways in, and they answer the same question from the same dated data:

1. Call the free HTTP API directly — the durable, machine-native path (below). An agent that keeps a dependency list can re-check it on every build.
2. Run it as an MCP server — a thin stdio wrapper over that same API, for MCP clients.

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1. The free API (call it directly)

No key. No signup. 60 requests/minute, anonymous GET. Every response is a dated observation with its source — not a score, not advice. Base URL https://lastseen.dev.

# one component (owner/repo)
curl https://lastseen.dev/api/v1/entity/actions/checkout

# everything held under a GitHub owner/org
curl https://lastseen.dev/api/v1/org/actions

# a whole manifest at once (names-only body)
curl -X POST https://lastseen.dev/api/v1/manifest \
  -H 'content-type: application/json' \
  -d '{"channel":"api","components":[{"name":"actions/checkout","kind":"github-action"}]}'

# self-describing API docs (JSON)
curl https://lastseen.dev/api/v1/docs

A single-component response carries the latest_state, the dated series behind it, the source_of_record, and interval-censoring notes — enough to re-check any verdict against GitHub yourself. This is the recurring path: wire GET /api/v1/entity/{owner}/{repo} into CI and a dead dependency shows up on the build that introduces it, not months later.

Contract

• Lookups, not advice. Every answer is a dated observation with its source. Never "use X instead", never a composite score, never a ranking by preference, never urgency language.
• Fails closed. An unknown or fabricated subject returns a clean not_observed — never a fabricated result. A network/store error degrades (try later); it is never read as "dead".
• Absence ≠ gone. No record means "not checked", never "deleted". Only an authoritative HTTP 404 is a deletion.

States

alive (≤180d since last commit) · dormant (180–365d) · abandoned (>365d) · archived (repo archived) · deleted (authoritative HTTP 404) · eol (declared end-of-life) · unknown-stale (the observation the verdict rests on is older than the 180-day threshold and was not re-verified — no state asserted; not a death) · not_observed (403 / 429 / timeout / not held — not dead).

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2. Run it as an MCP server

A pure-standard-library stdio wrapper over the API above — no mcp package, no requests, no FastAPI/Starlette, nothing that can conflict with a host app. It speaks JSON-RPC 2.0 over stdio and calls the free API over urllib.

Install

pipx install lastseen-mcp
# or run without installing:
uvx lastseen-mcp

Requires Python ≥ 3.10. No dependencies.

Add to an MCP client

{
  "mcpServers": {
    "lastseen": { "command": "lastseen-mcp" }
  }
}

(If you use uvx, set "command": "uvx", "args": ["lastseen-mcp"].)

Tools

Tool	What it does
check_entity(slug, live?)	Dated survival series for one owner/repo (e.g. actions/checkout). live=true attaches a live GitHub read (absence ≠ gone).
check_org(name)	Dated states for every held component under a GitHub owner/org.
check_manifest(paste)	Paste a GitHub Actions workflow (uses: refs) or owner/repo lines; get the dated state per component. Unheld components are not_observed.
survival_profile(category)	Category ranking — not available over the free API; returns an honest not-supported result pointing to the per-entity/org/manifest lookups and the CC-BY dumps.

check_manifest looks up at most 30 parsed components per call (free-tier rate bound); any remainder is reported as n_truncated.

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Privacy

Zero telemetry. The client and the API store nothing and transmit no identifier about you, your org, or the subjects you look up — anonymous GETs only.

Licensing

• Code: MIT (see LICENSE).
• Data: the mortality/survival observations are published by lastseen.dev under CC-BY-4.0 (attribution required). The two licenses are independent.

Links

• Service & data: https://lastseen.dev
• API docs (self-describing JSON): https://lastseen.dev/api/v1/docs
• MCP registry entry: dev.lastseen/mortality