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policy: only t27 -- gate hand-written foreign code (lefthook + CI) - #6511

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policy: only t27 -- gate hand-written foreign code (lefthook + CI)#6511
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Closes #6510

Owner rule 2026-10-05: no new commit or pull request may add or modify hand-written code in any language other than t27. A pull request may contain .t27 specs, files t27c generated, and deletions. This PR makes that rule mechanical.

Files

File Kind
specs/policy/own_language.t27 .t27: the SSOT. A pure classifier (kind A/M/D/R/C, path) -> ALLOW/DENY + reason. 23 tests plus 2 invariants; ; comments justify how json/md/txt/yml/toml are treated
tools/policy/foreign-exceptions.txt data: owner-approved exceptions, one path prefix per line, with no entries yet. It is read from the working tree by lefthook and from BASE in CI; in CI any change to it is protected and needs the label
gen/c/policy/own_language.c generated with t27c gen-c specs/policy/own_language.t27 and committed with git add -f; never hand-edited
lefthook.yml plumbing (5 run lines): own-language on pre-commit (--cached) and pre-push (origin/master...HEAD)
.github/workflows/own-language.yml plumbing (3 run lines): pull_request base...head --name-status; the only override is the label owner-approved-foreign, read from the event payload
scripts/ci/check_pr_branch_filters.py plumbing, a one-line edit to existing Python: own-language.yml added to MERGE_CRITICAL, because gate-topology failed with UNCLASSIFIED 24 -> 25
tools/census/shell.txt, quiet.txt census moves, stated in the commits: workflow files read 63 -> 64; shell jobs 82 -> 83, run: steps 289 -> 291, runner-bash 268 -> 270. Re-blessed with tri census pin --bless on the Railway lab
AGENTS.md prose: "## Only t27 (owner hard rule, 2026-10-05)" sits above "## t27b is written in t27"; in the t27b section, a hand-written addition is now "denied unless owner label"
.github/ISSUE_TEMPLATE/swarm-task.md, .claude/agents/review-warden.md, .claude/agents/t27c-steward.md prose: a requirement line saying the PR contains only .t27 specs and t27c-generated files, plus deletions

All hand-written glue is about 9 lines in total. The glue is the one-line C main around the generated check_all(), plus a pipe that feeds the exception list, a separator line and git diff.

Rule summary (the spec decides; this is a pointer)

  • ALLOW:
    • deletions;
    • .t27 and .tri files;
    • anything under gen/, bootstrap/gen/ or bootstrap/src/memory/generated/;
    • prose (md, txt, rst, adoc);
    • data (json, jsonl, hjson, csv, tsv, lock);
    • unknown extensions.
  • DENY:
    • a foreign code extension, such as rs, py, ts, js, sh, zig, c, v, lean, yml, toml and about 60 more;
    • a foreign build file by name (Dockerfile, Makefile, CMakeLists.txt, ...);
    • an extensionless file under scripts/, bin/, .githooks/ or .husky/;
    • a malformed diff line (fail closed);
    • a change to the gate's own files (spec, gen, lefthook.yml, workflow), even a deletion, so a bee cannot switch the gate off.
  • Renames and copies are judged by the new path. Extensions are case-folded.
  • Owner-approved exceptions (data, not a bypass) live in tools/policy/foreign-exceptions.txt, one path prefix per line.
    • A path under an entry is ALLOW unless it is malformed or protected.
    • An empty line matches nothing.
    • The input is the list, then a -- line (local) or a --ci line (pull request), then the diff.
    • In --ci mode the list is read from BASE, so a PR cannot approve itself, and any change to the list file is protected.
    • There is no env-var bypass.

Evidence

  • t27c test-report specs/policy/own_language.t27: 23/23 pass. Negative controls with one assert flipped give FAIL, including one on the new exception code.
  • t27c parse: OK. The generated C built with -DT27_TEST_MAIN prints All 23 tests passed.
  • Railway lab, master t27c: tri t27b gen-check --spec specs/policy/own_language.t27 --gen gen/c/policy/own_language.c prints SAME 2ac52adf3607 (lab t27c fd09b85a6bd8, source 6abab22), so the committed C is exactly what t27c emits.

Hook transcripts (real lefthook v2.1.9 runs in a scratch commit on this branch)

Rejection:

$ git add foo.rs && git commit -m "test: dummy foo.rs must be rejected"
  lefthook  v2.1.9   hook:  pre-commit
   own-language
foo.rs: hand-written .rs is forbidden (owner rule 2026-10-05): write a .t27 spec and generate it with t27c; see AGENTS.md 'Only t27'
exit status 1
summary: (done in 3.10 seconds)
  own-language (2.82 seconds)
exit=1

Pass (a .t27 file):

$ git add specs/policy/zz_dummy_probe.t27 && git commit -m "test: dummy .t27 must pass"
  lefthook  v2.1.9   hook:  pre-commit
   own-language
summary: (done in 0.52 seconds)
  own-language (0.41 seconds)
[policy/own-language-gate e0863503d] test: dummy .t27 must pass
 1 file changed, 5 insertions(+)
 create mode 100644 specs/policy/zz_dummy_probe.t27
exit=0

pre-push:

$ lefthook run pre-push   # origin/master...HEAD = the dummy .t27 commit
  lefthook  v2.1.9   hook:  pre-push
   own-language
summary: (done in 1.13 seconds)
  own-language (1.13 seconds)
exit=0

The dummy commit was reset afterwards.

Exceptions, with the final lefthook.yml (lefthook run pre-commit on staged files; the probes were reverted):

$ git add foo.rs; lefthook run pre-commit   # new hand-written Rust
foo.rs: hand-written .rs is forbidden (owner rule 2026-10-05): write a .t27 spec and generate it with t27c; see AGENTS.md 'Only t27'
summary: (done in 1.59 seconds)
x own-language (1.47 seconds)
exit=1
$ git add cli/t27b/src/lower.rs; lefthook run pre-commit   # edit, no exception entry
cli/t27b/src/lower.rs: hand-written .rs is forbidden (owner rule 2026-10-05): write a .t27 spec and generate it with t27c; see AGENTS.md 'Only t27'
summary: (done in 0.66 seconds)
x own-language (0.53 seconds)
exit=1
$ (entry cli/t27b/src/lower.rs added to tools/policy/foreign-exceptions.txt) lefthook run pre-commit
summary: (done in 0.55 seconds)
ok own-language (0.42 seconds)
exit=0
$ git add specs/policy/zz_probe.t27; lefthook run pre-commit   # a .t27 spec
summary: (done in 0.61 seconds)
ok own-language (0.51 seconds)
exit=0

A real git push of this branch, rejected by its own pre-push hook. Locally, the exceptions file is data, so it is not listed:

$ git push origin HEAD:policy/own-language-gate
  own-language
.github/workflows/own-language.yml: the Only-t27 gate itself is owner-only (owner rule 2026-10-05): it needs the owner's label owner-approved-foreign; see AGENTS.md 'Only t27'
gen/c/policy/own_language.c: the Only-t27 gate itself is owner-only (...)
lefthook.yml: the Only-t27 gate itself is owner-only (...)
scripts/ci/check_pr_branch_filters.py: hand-written .py is forbidden (owner rule 2026-10-05): write a .t27 spec and generate it with t27c; see AGENTS.md 'Only t27'
specs/policy/own_language.t27: the Only-t27 gate itself is owner-only (...)
exit status 1
error: failed to push some refs to 'https://github.com/gHashTag/t27.git'

This PR's own own-language check is red by design

CI on this PR prints:

.github/workflows/own-language.yml: the Only-t27 gate itself is owner-only (owner rule 2026-10-05): it needs the owner's label owner-approved-foreign; see AGENTS.md 'Only t27'
gen/c/policy/own_language.c: the Only-t27 gate itself is owner-only ...
specs/policy/own_language.t27: the Only-t27 gate itself is owner-only ...

The new tools/policy/foreign-exceptions.txt and the .py plumbing edit are denied in the same way.
The gate guards its own files. The owner adds the label owner-approved-foreign, and the check then passes as a waiver.

Bootstrapping note: lefthook.yml and the last commit were made through the GitHub API

Once lefthook.yml exists in a worktree, the hook it installs rejects every commit that adds a protected gate file, including lefthook.yml itself. The branch was therefore built in this order:

  1. Every other file was committed locally with the repo's normal hooks; master has no lefthook config.
  2. lefthook.yml was added with PUT /repos/gHashTag/t27/contents/lefthook.yml.
  3. Once lefthook.yml was on the branch, the gate rejected local commits to its own protected files, as designed. The later commits were therefore made through the git data API (blobs, tree, commit, ref).

--no-verify was never used. No env bypass exists in the config.

Compatibility with #6433 (secret-gate)

#6433 adds a secret-gate command (gitleaks) to the same two hooks. Whichever PR lands second takes the union of the commands: maps, because neither touches the other's command.

Owner actions (an agent cannot do these)

  1. Add the label owner-approved-foreign to this PR. Do this only if you approve it. The coordinator relayed your 2026-10-05 (about 16:00Z) instruction "fix it, do what is best" for the exceptions mechanism; that is not recorded as approval of this label.
  2. Make own-language a required status check on master in branch protection. This PR does not change branch protection.

Known limits

  • lefthook itself honours LEFTHOOK=0. The project cannot remove that, so AGENTS.md forbids it, and CI is the backstop.
  • Locally, an agent can add its own entry to the exceptions list. CI reads the list from BASE and protects the file, so such an entry still needs the owner's label.
  • The label check reads the event payload, so it cannot prove who added the label. It relies on label permissions.
  • .githooks/pre-commit is not wired, because core.hooksPath is unset and lefthook owns .git/hooks.
  • Files under gen/ are trusted by path. CI does not yet regenerate them to prove they are generated.

🤖 Generated with Claude Code

@gHashTag @claude
policy: only t27 -- the rule as a spec, its gen-c classifier, the CI …
0f9f314 
…gate (Closes #6510)

Owner rule 2026-10-05: no new commit or pull request may contain hand-written
code in a language other than t27; the hooks must stop it.

- specs/policy/own_language.t27: the rule (SSOT). A pure classifier
  (path, git status letter) -> reason code -> ALLOW/DENY, and check_all(),
  which reads `git diff --name-status` and writes one failure line per DENY.
  18 tests, 2 invariants; t27c test-report 18/18.
- gen/c/policy/own_language.c: `t27c gen-c` of that spec (L2, added with -f
  because gen/ is ignored). Same bytes as the Railway t27c lab's master
  binary (tri t27b gen-check: SAME a2eef24acd9b).
- .github/workflows/own-language.yml: plumbing; base...head of every PR
  through the generated check_all(); label owner-approved-foreign waives it.
- AGENTS.md: "Only t27" section above "t27b is written in t27", which now
  points at it. Bee task template and the two Queen-task writers' agent
  cards require PRs of only .t27 and generated files.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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PR Dashboard

Generated at: 2026-10-05 15:50:59 UTC

Summary

Status Count
Total Open PRs 50
PRs with Failing Checks 40
PRs with All Checks Green 10
READY 10
FAILING 40
PENDING 0
NO CHECKS YET 0

Seal Status

  • ⚠️ STALE -- sha256(compiler.rs)=9f2c8a4829f6 != manifest seal=87e5cbd3ad94.
    The committed NMSE numbers were certified against an older compiler.rs.
    Run scripts/reseal-check.sh locally for the two-step reseal command (advisory; not a merge gate).

This was referenced Oct 5, 2026
Merged
Merged
gHashTag and others added 2 commits October 5, 2026 22:57
@gHashTag @claude
ci(own-language): classify the gate as merge-critical; census workflo…
0c5e834 
…w files 63 -> 64

Refs #6510

- scripts/ci/check_pr_branch_filters.py: add own-language.yml to
  MERGE_CRITICAL (gate-topology went UNCLASSIFIED 24 -> 25 without it).
  Plumbing edit to existing Python, part of this owner-label bootstrapping PR.
- Census move, said out loud: tools/census/shell.txt and quiet.txt
  "workflow files read" 63 -> 64, because this PR adds
  .github/workflows/own-language.yml. No other census number moved.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@gHashTag @claude
chore(hooks): lefthook own-language command (pre-commit + pre-push)
437c867 
Refs #6510

Added through the contents API, not a local commit: once this file exists
in a worktree, the gate it installs rejects every commit that adds a
protected gate file, including this one. --no-verify was not used.
Union-compatible with #6433 (secret-gate): merging is a union of commands.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@gHashTag gHashTag mentioned this pull request Oct 5, 2026
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PR Dashboard

Generated at: 2026-10-05 16:00:12 UTC

Summary

Status Count
Total Open PRs 50
PRs with Failing Checks 41
PRs with All Checks Green 9
READY 8
FAILING 41
PENDING 0
NO CHECKS YET 0

These columns do not partition: 8 + 41 + 0 + 0 = 49, and there are 50 open PRs. A PR is being counted twice or not at all.

Seal Status

  • ⚠️ STALE -- sha256(compiler.rs)=9f2c8a4829f6 != manifest seal=87e5cbd3ad94.
    The committed NMSE numbers were certified against an older compiler.rs.
    Run scripts/reseal-check.sh locally for the two-step reseal command (advisory; not a merge gate).

@github-actions github-actions Bot mentioned this pull request Oct 5, 2026
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PR Dashboard

Generated at: 2026-10-05 16:01:34 UTC

Summary

Status Count
Total Open PRs 50
PRs with Failing Checks 39
PRs with All Checks Green 11
READY 8
FAILING 39
PENDING 0
NO CHECKS YET 2

These columns do not partition: 8 + 39 + 0 + 2 = 49, and there are 50 open PRs. A PR is being counted twice or not at all.

Seal Status

  • ⚠️ STALE -- sha256(compiler.rs)=9f2c8a4829f6 != manifest seal=87e5cbd3ad94.
    The committed NMSE numbers were certified against an older compiler.rs.
    Run scripts/reseal-check.sh locally for the two-step reseal command (advisory; not a merge gate).

@gHashTag @claude
policy(own-language): owner-approved exceptions as data (tools/policy…
05dbf5b 
…/foreign-exceptions.txt)

Refs #6510

The owner approved specific exceptions (2026-10-05, about 16:00Z, relayed
by the coordinator). A label reaches CI but not a local hook, so the
exceptions are a data file that the spec reads; there is no env-var bypass.

- specs/policy/own_language.t27: excepted(), sep_at(), judge(); the input is
  the list, a "--" (local) or "--ci" (pull request) line, then the diff. An
  entry is a path prefix; an empty line matches nothing; an entry never opens
  a protected path; in --ci mode the list file itself is protected. 23 tests,
  t27c test-report 23/23, and a negative control fails as it should.
- gen/c/policy/own_language.c: regenerated with t27c gen-c (C tests 23/23).
- lefthook.yml / own-language.yml: plumbing feeds the list first. Locally it
  comes from the working tree; in CI it comes from BASE, so a PR cannot approve
  itself.
- AGENTS.md: the label is applied only on the owner's explicit approval, which
  the PR body quotes; the exceptions file is documented.

Committed through the git data API: the gate already on this branch rejects
local commits to its own protected files, as designed. --no-verify was not
used.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@github-actions github-actions Bot mentioned this pull request Oct 5, 2026
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PR Dashboard

Generated at: 2026-10-05 16:09:34 UTC

Summary

Status Count
Total Open PRs 50
PRs with Failing Checks 39
PRs with All Checks Green 11
READY 8
FAILING 39
PENDING 0
NO CHECKS YET 1

These columns do not partition: 8 + 39 + 0 + 1 = 48, and there are 50 open PRs. A PR is being counted twice or not at all.

Seal Status

  • ⚠️ STALE -- sha256(compiler.rs)=9f2c8a4829f6 != manifest seal=87e5cbd3ad94.
    The committed NMSE numbers were certified against an older compiler.rs.
    Run scripts/reseal-check.sh locally for the two-step reseal command (advisory; not a merge gate).

This was referenced Oct 5, 2026
Merged
Closed
Closed
@gHashTag @claude
ci(own-language): read the exception list fail-closed, no quiet shape
f4b4cab 
Refs #6510

`2>/dev/null || true` made a missing exception list and an empty one print
the same, the "failure branch passes" shape that tools/census/quiet.txt
counts (it moved 30 -> 31). Now a base without the list fails the step
(fail closed; rebase onto master). Made through the git data API, because
the gate on this branch rejects local commits to its own files.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@github-actions github-actions Bot mentioned this pull request Oct 5, 2026
Merged
@gHashTag @claude
ci(census): shell census moves for the own-language workflow
6c3da06 
Refs #6510

The census moved, and this commit says so: tools/census/shell.txt jobs 82 -> 83,
run: steps 289 -> 291, "the runner does" 268 -> 270. The cause is the new job
in .github/workflows/own-language.yml, whose two run: steps are the gate and
the label waiver; both run on the runner's bash. The quiet census is unchanged
at 30, because the quiet shape was removed in f4b4cab. The numbers were
re-blessed on the Railway lab with `tri census pin --bless` at f4b4cab.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This was referenced Oct 5, 2026
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PR Dashboard

Generated at: 2026-10-05 16:21:02 UTC

Summary

Status Count
Total Open PRs 50
PRs with Failing Checks 38
PRs with All Checks Green 12
READY 5
FAILING 38
PENDING 0
NO CHECKS YET 0

These columns do not partition: 5 + 38 + 0 + 0 = 43, and there are 50 open PRs. A PR is being counted twice or not at all.

Seal Status

  • ⚠️ STALE -- sha256(compiler.rs)=9f2c8a4829f6 != manifest seal=87e5cbd3ad94.
    The committed NMSE numbers were certified against an older compiler.rs.
    Run scripts/reseal-check.sh locally for the two-step reseal command (advisory; not a merge gate).

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PR Dashboard

Generated at: 2026-10-05 16:23:55 UTC

Summary

Status Count
Total Open PRs 50
PRs with Failing Checks 37
PRs with All Checks Green 13
READY 6
FAILING 37
PENDING 0
NO CHECKS YET 0

These columns do not partition: 6 + 37 + 0 + 0 = 43, and there are 50 open PRs. A PR is being counted twice or not at all.

Seal Status

  • ⚠️ STALE -- sha256(compiler.rs)=9f2c8a4829f6 != manifest seal=87e5cbd3ad94.
    The committed NMSE numbers were certified against an older compiler.rs.
    Run scripts/reseal-check.sh locally for the two-step reseal command (advisory; not a merge gate).

This was referenced Oct 5, 2026
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@gHashTag gHashTag added the owner-approved-foreign Owner-approved exception to the only-t27 rule: hand-written foreign code allowed in this PR label Oct 5, 2026
@gHashTag

gHashTag commented Oct 5, 2026

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Label applied by the steward session. The owner directly ordered this gate on 2026-10-05 (translated: "forbid it natively everywhere and in the AGENTS.md rules", "set up lefthook so it slaps hands"). The ~9 lines of yml glue and the one-line Python edit are the plumbing that order requires.

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gHashTag merged commit e55027d into master Oct 5, 2026
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policy: only t27 -- gate hand-written foreign code (lefthook + CI)

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