Add dataset card

README.md

@@ -1,97 +1,62 @@
+---
+license: cc-by-4.0
+language:
+  - en
+pretty_name: Nerq MCP-server repository mortality (2026-07)
+size_categories:
+  - 10K<n<100K
+tags:
+  - mcp
+  - model-context-protocol
+  - software-supply-chain
+  - component-mortality
+  - repository-liveness
+  - github
+task_categories:
+  - tabular-classification
+---
+
 # Nerq MCP-server repository mortality — dataset dump (2026-07)
 
-**Version:** 2026-07 · **As of:** 2026-07-22 · **Rows:** 28,824 · **License:** CC-BY 4.0
+**As of:** 2026-07-22 · **Rows:** 28,824 · **License:** CC-BY 4.0
+**Publisher: lastseen.dev (organisation).**
 
-© 2026 Nerq. Licensed CC-BY 4.0 — free to use, share, adapt, and use commercially, with attribution to
-Nerq (link back). No share-alike. Dated factual observations, without warranty. The continuously-updated
-series is available via the free Nerq API.
+Canonical reference: Zenodo DOI https://doi.org/10.5281/zenodo.21869879 (cite this; always resolves to the latest version).
 
-## What this is
+© 2026 lastseen.dev. Licensed CC-BY 4.0 — free to use, share, adapt, and use commercially, with attribution to lastseen.dev (link back). No share-alike. Dated factual observations, without warranty. The continuously-updated series is available via the free lastseen.dev / Nerq API.
 
-A dated observation spine over the public GitHub repositories linked from indexed **Model Context
-Protocol (MCP)** servers, classified by repository liveness. One row per observation. **28,824 rows**
-in this dump, all from the seed census taken **2026-07-22**.
+## Dataset summary
 
-This is the same population as **The Nerq Census No.1 / No.2 (2026)** ("The MCP Deadpool"), released
-as a dated observation spine rather than a one-verdict-per-repo summary.
+One row per dated observation of a public GitHub repository linked from an indexed Model Context Protocol (MCP) server, classified by repository liveness. Same population as The Nerq Census No.1 / No.2 (2026).
 
 ## Files
 
-- `nerq-mcp-mortality-2026-07.csv` — one row per observation, all columns below.
-- `nerq-mcp-mortality-2026-07.json` — the same rows as a JSON array under `rows`, preceded by a
-  metadata head (version, as-of, license, state counts, columns).
-
-## Schema (columns)
-
-| column | type | meaning |
-|---|---|---|
-| `entity_id` | text | GitHub `owner/repo` of the MCP server. |
-| `registry` | text | source registry tag. All rows in this dump: `mcp`. |
-| `observed_date` | date `YYYY-MM-DD` | the day this observation was taken (as-of). |
-| `state` | text | `deleted` \| `abandoned` \| `dormant` \| `alive` \| `unknown` (see thresholds). |
-| `http_status` | int / blank | raw HTTP seen (`200` / `404`), or blank if not read at seed. |
-| `last_commit` | timestamp / blank | the repo's own last public commit timestamp; blank if none read (e.g. `404`). Repository timestamp, NOT author identity. |
-| `source` | text | how the row was produced: `census-no2-seed` (all rows in this dump) or `re-probe` (future rows). |
-| `provenance` | text | `own` — every row is a Nerq first-hand read (the repo's own public `commits.atom` / HTTP status). None are ingested third-party data. |
-
-## State thresholds (exact)
+- `nerq-mcp-mortality-2026-07.csv` — one row per observation.
+- `nerq-mcp-mortality-2026-07.json` — the same rows plus a metadata head.
 
-State is derived from `http_status` and the age of `last_commit` measured against `observed_date`:
+## Columns
 
-- `deleted` — HTTP `404` (repository deleted OR made private/inaccessible; code may live on privately).
-- `alive` — reachable (`200`) and last commit **≤ 180 days** before `observed_date`.
-- `dormant` — reachable and last commit **> 180 and ≤ 365 days** before `observed_date`.
-- `abandoned` — reachable and last commit **> 365 days** before `observed_date`.
-- `unknown` — state could not be resolved at seed (41 rows).
+`entity_id`, `registry`, `observed_date`, `state`, `http_status`, `last_commit`, `source`, `provenance`.
 
-Full derivation in `methodology.md`.
+Full schema, thresholds, and interval-censoring notes are in `README.md` and `methodology.md`.
 
-## State counts in this dump (as of 2026-07-22)
+## State thresholds
 
-| state | rows |
-|---|---|
-| alive | 20,390 |
-| deleted | 3,448 |
-| abandoned | 2,686 |
-| dormant | 2,259 |
-| unknown | 41 |
-| **total** | **28,824** |
+- `deleted` — HTTP 404 (deleted or made private).
+- `alive` — reachable, last commit ≤ 180 days before `observed_date`.
+- `dormant` — reachable, 180–365 days.
+- `abandoned` — reachable, > 365 days.
+- `unknown` — unresolved at seed.
 
-## Interval-censoring (what "observed_date" does and does not tell you)
+## State counts (2026-07-22)
 
-Each row states that an entity was in a given state **on that observation date** — nothing more. A
-state transition (for example a repository going `alive → deleted`) can only be located to the
-**interval between two observations**, never to an exact instant.
-
-- This dump is a single-day seed (all rows `2026-07-22`), so for a `deleted` row the exact death
-  date is **unknowable** from this dump alone — it is censored to the interval between the repo's
-  `last_commit` and `2026-07-22`.
-- The living series adds `re-probe` rows over time, narrowing those intervals. Between probe passes
-  there are collection gaps; there is a **known collection gap on 2026-07-30** during which no fresh
-  observation was recorded, so any transition spanning that day is censored to the surrounding
-  interval rather than pinned to it. Gaps are disclosed, not smoothed over.
-
-## What we observe vs what we ingest
-
-- **Observe (this dump):** repository liveness — read first-hand from each repo's public
-  `commits.atom` feed and HTTP status (`provenance = own`). No API key, not rate-limited.
-- **Ingest (NOT in this dump):** upstream registry lifecycle fields (e.g. an MCP registry's own
-  `statusChangedAt`) are kept provenance-separate and are not mixed into these `own` rows.
+alive 20,390 · deleted 3,448 · abandoned 2,686 · dormant 2,259 · unknown 41 · total 28,824.
 
 ## Caveats
 
-- `404` = deleted **or** made private — we say "deleted / inaccessible", not "proven deleted".
-- `last_commit` is the default branch's last commit read from `commits.atom`; a small boundary class
-  near the 180-day line may differ from the GitHub REST API `pushed_at`.
-- This is a **prevalence** dump (state at the as-of date), not a lifespan study. MCP births are
-  left-censored, so median lifespan is not computable from this dump alone.
-
-## Cite
+`404` conflates deletion and privatization. `last_commit` is the default-branch last commit from `commits.atom`. Prevalence dump, not a lifespan study (MCP births are left-censored). Interval-censoring and a known 2026-07-30 collection gap are disclosed in the methodology.
 
-Nerq. *MCP-server repository mortality — dataset dump (2026-07).* nerq.ai. CC-BY-4.0.
+## Citation
 
-**DOI.** This dataset is deposited on Zenodo with versioning. **Cite the Concept DOI**
-`10.5281/zenodo.XXXXXXX` (placeholder until minted) — it always resolves to the latest
-monthly version. For a reproducible snapshot, cite the version DOI of the release you used
-(e.g. the `2026-07` version). New versions are published **monthly**; corrections between
-releases appear first on the live series and are folded into the next monthly version.
+lastseen.dev. *Nerq MCP-server repository mortality — dataset dump (2026-07).* CC-BY-4.0.
+Canonical DOI: https://doi.org/10.5281/zenodo.21869879