The stamp is written beside the page set, and a later build removes it

outcome

Execute the stamp step apart from the build: it touches no page, and no stamp outlives its build.

assumptions

• The world writes a root with one Pack of two member Specs, runs the studio command, keeps the bytes of every page file, runs the stamp command, reads stamp.json and compares the page files with the kept bytes, then runs the studio command again and checks whether stamp.json exists.

Examples

Given a page set the studio command wrote at an extraction root
When the stamp command runs with the commit {commit: "0123abc"} and the source template {source: "https://example.test/blob/0123abc/{file}#L{line}"}
Then the stamp names the corpus commit {corpusCommit: "0123abc"}
Then every page file stays byte-identical: {pagesUntouched: true}
Then a later studio run keeps the stamp: {stampSurvives: false}

Verifier bindings

• test:protocol.studio-stamp-apart · anchored · test anchor binding present · test/studio-s4.test.ts:557

  External run evidence from test/studio-s4.test.ts

  Test anchors: test:protocol.run-absolute, test:protocol.run-external, test:protocol.run-unjoined, test:protocol.studio-graph-only, test:protocol.studio-inputs-both-given, test:protocol.studio-stamp-apart. Specs verified by those bindings: spec:consumers.spec-studio.data.inputs, spec:consumers.spec-studio.data.inputs.both-given, spec:consumers.spec-studio.data.inputs.graph-only, spec:consumers.spec-studio.runs-page, spec:consumers.spec-studio.runs-page.external-evidence, spec:consumers.spec-studio.sharing, spec:consumers.spec-studio.sharing.stamp-written-apart, spec:observation.run-evidence, spec:observation.run-evidence.absolute-path-joins, spec:observation.run-evidence.unanchored-file-unjoined.

  Run 1: external run evidence from vitest 4.1.10

  Build: CI 433 · Branch: fix/second-review-pass · Commit: 6375b6e431a7cf885a49befec76d7876cd3e538c · Start: 2026-11-04T07:12:23.076Z · Stop: 2026-11-04T07:15:49.695Z

  Name	Suite	Result	Duration
  recipe 45 joins normalized paths, preserves records and graph facts, and diagnoses other inputs	not recorded	passed	65.6 ms
  renders external run evidence with result rows, metadata, diagnostics and conditional navigation	not recorded	passed	86.57 ms
  reads repeated --runs before extraction and leaves input bytes untouched	not recorded	passed	127.58 ms
  stamps apart, touches no page, refuses bad sources and removes the stamp on rebuild	not recorded	passed	65.92 ms
  executes the bound example against a fresh world	A test whose reporter wrote an absolute path joins its anchored file (spec:observation.run-evidence.absolute-path-joins)	passed	8.75 ms
  executes the bound example against a fresh world	A test in a file with no test anchor is reported as unjoined (spec:observation.run-evidence.unanchored-file-unjoined)	passed	9.92 ms
  executes the bound example against a fresh world	The runs page shows a run as external evidence from a test file (spec:consumers.spec-studio.runs-page.external-evidence)	passed	20.83 ms
  executes the bound example against a fresh world	Without inputs the page set is the graph's alone (spec:consumers.spec-studio.data.inputs.graph-only)	passed	51.5 ms
  executes the bound example against a fresh world	Both inputs add their pages, named, and the same inputs write the same bytes (spec:consumers.spec-studio.data.inputs.both-given)	passed	107.17 ms
  executes the bound example against a fresh world	The stamp is written beside the page set, and a later build removes it (spec:consumers.spec-studio.sharing.stamp-written-apart)	passed	40.07 ms
  the stamp links source locations only after an HTTP stamp loads, encoding path segments	not recorded	passed	4.7 ms
  recipe 45 picks the longest suffix and scopes through enabled examples at file grain	not recorded	passed	8.9 ms
  ships a reusable preview, disabled by default, and deploys its own pull requests with runs and diff	not recorded	passed	12.5 ms
  the tests lens counts file results once per Spec and names every run input	not recorded	passed	34.74 ms
  the Pack sentence keeps the graph's binding limit and positively names external evidence	not recorded	passed	27.7 ms
  run metadata labels build and branch, and absent fields read not recorded	not recorded	passed	0.71 ms
  unjoined records escape outside names and explain both reason codes in words	not recorded	passed	17.08 ms
  run files show the file alone, bindings and Suite, with one header per run	not recorded	passed	15.7 ms
  recipe 45 does not join a suffix inside a path segment	not recorded	passed	3.66 ms
  stamp defaults to unknown and a stamped page set passes check-clean	not recorded	passed	61.24 ms
  every reusable preview job's permissions fit the CI caller's grant	not recorded	passed	17.61 ms
  PR checks and preview stamps name the same default merge checkout	not recorded	passed	18.03 ms
  preview download is optional and cancelled or skipped checks do not call it	not recorded	passed	9.97 ms
  deploy checks the enabled Pages source before writing: gh-pages	not recorded	passed	21.58 ms
  deploy checks the enabled Pages source before writing: main	not recorded	passed	24.8 ms
  deploy checks the enabled Pages source before writing: disabled	not recorded	passed	16.95 ms
  deploy succeeds only once Pages publishes the pushed commit: an unrelated errored build is newest	not recorded	passed	105.9 ms
  deploy succeeds only once Pages publishes the pushed commit: a retried build follows an errored one	not recorded	passed	40.18 ms
  deploy succeeds only once Pages publishes the pushed commit: the build errors	not recorded	passed	49.1 ms
  deploy succeeds only once Pages publishes the pushed commit: the commit is never built	not recorded	passed	883 ms
  deploy succeeds only once Pages publishes the pushed commit: the answer arrives after the wait	not recorded	passed	1541.12 ms
  preview still stamps and uploads rendered pages when evidence is absent and validation fails	not recorded	passed	119.97 ms
  places external file rows under their verifier and renders shared files once	not recorded	passed	82.22 ms
  accepts the preview workflow's base and run flags together	not recorded	passed	37.48 ms
  formats external run durations to at most two decimals on every page	not recorded	passed	20.5 ms
  preview stamps only this invocation's page set: malformed-runs	not recorded	passed	768.96 ms
  preview stamps only this invocation's page set: escaping-parent	not recorded	passed	77.01 ms
  preview stamps only this invocation's page set: fresh-findings	not recorded	passed	1647.57 ms

Requirement drawing

• Satisfying or referencing units: no recorded binding.

Decisions

No decision record named.

No implementation neighborhood recorded.

Runtime observation: not tracked.

Runtime observation: not tracked.

Build attestations: not tracked.

Deployments: not tracked.

Bills of materials: not tracked.