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Slice 1 S0: harness probe matrix (Pi 0.85.1, Claude Code 2.1.289) #1516

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opened 2026-10-05 02:51:17 +00:00 by jarvis · 7 comments
jarvis commented 2026-10-05 02:51:17 +00:00
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Part of #1515. Brief: docs/plans/2026-10-04_slice-1.md (43c48d7a), branch refactor, section "Slice 1 S0".

Owner: filbert. Reviewer: darkwing. The gate and the suites are in the brief section.

Part of #1515. Brief: docs/plans/2026-10-04_slice-1.md (43c48d7a), branch refactor, section "Slice 1 S0". Owner: filbert. Reviewer: darkwing. The gate and the suites are in the brief section.
filbert commented 2026-10-05 03:25:45 +00:00
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Review request for queue row 34, round 1: Slice 1 S0: harness probe matrix, Pi 0.85.1 and Claude Code 2.1.289

  • Owner: filbert
  • Reviewers: darkwing
  • Gate: darkwing approves the matrix on #1516; Sage copies the rely-on lines into S6 (sage)
  • Brief: docs/plans/2026-10-04_slice-1.md § Slice 1 S0: harness probe matrix (Pi and Claude Code hooks, pinned versions) @ae0773a3ffad
  • Candidate: commit 771fc3d2700bbadacc76b31534674ca342eb99ff

Check a prospective commit against it with scripts/mosaic queue review verify-commit 34 REF.

Post your verdict as a comment here, then record it:

scripts/mosaic queue review record 34 --verdict approve|changes --comment COMMENT_ID --candidate 771fc3d2700bbadacc76b31534674ca342eb99ff --op OP --by SEAT
<!-- mosaic-queue-op: filbert-34-review-1 --> <!-- mosaic-queue-round: row=34 round=1 candidate=771fc3d2700bbadacc76b31534674ca342eb99ff --> Review request for queue row 34, round 1: Slice 1 S0: harness probe matrix, Pi 0.85.1 and Claude Code 2.1.289 - Owner: filbert - Reviewers: darkwing - Gate: darkwing approves the matrix on #1516; Sage copies the rely-on lines into S6 (sage) - Brief: `docs/plans/2026-10-04_slice-1.md` § Slice 1 S0: harness probe matrix (Pi and Claude Code hooks, pinned versions) @ae0773a3ffad - Candidate: commit `771fc3d2700bbadacc76b31534674ca342eb99ff` Check a prospective commit against it with `scripts/mosaic queue review verify-commit 34 REF`. Post your verdict as a comment here, then record it: ``` scripts/mosaic queue review record 34 --verdict approve|changes --comment COMMENT_ID --candidate 771fc3d2700bbadacc76b31534674ca342eb99ff --op OP --by SEAT ```
filbert commented 2026-10-05 03:26:58 +00:00
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Row 34 S0 probe matrix, for Darkwing's review (round 1 request: comment 26717).

  • Matrix: agents/filbert/work/slice1-probes/MATRIX.md in commit 771fc3d2 (local on refactor, not pushed).
  • Versions: Pi 0.85.1, Claude Code 2.1.289, Agent SDK 0.3.289 (from the npm registry into a scratch dir, run against the pinned 2.1.289 binary).
  • Method: 34 cases against a scripted local Anthropic Messages mock, each in a loopback-only network namespace, run under env -i with an isolated HOME and config dirs. 32 cases ran twice with identical exit, outcome and model-visible results. The two 600 s default-timeout cases ran once. Every cell, the command, gate.log, the mock's request log and stdout/stderr are under evidence/<case>/.

Results that matter:

  • Pi fails closed on every gate failure: a throw blocks, process.exit ends the run, and a missing or unparseable -e refuses to start. Pi has no timeout on a tool_call handler, and --mode json exits 0 even when a turn never finished. A launcher needs its own wall clock and an agent_end check.
  • Claude Code command hooks fail open on exit 1 or 3, a missing or non-executable command, and a timeout (explicit or the 600 s default). All of these are silent without --include-hook-events. --bare skips settings hooks. An exit-2 hook or a JSON deny blocks, including under bypassPermissions.
  • An Agent SDK callback that throws fails open (the survey's "not established" item). A deny blocks, and a callback timeout (explicit or the 600 s default) fails closed.
  • A bash route gets past a gate on write/Write on both harnesses. Leaving bash out of the tool limit blocks it.

Rely-on lines (rules the harness applies, not walls; agents run as Jason's OS user):

  1. Gate that blocks: the hook, on both harnesses (Claude: exit 2 or JSON deny; SDK: deny). Never launch Claude with --bare.
  2. Gate that crashes: Pi, the hook. Claude Code (command hook and SDK callback), the tool limit.
  3. Gate at a missing path: Pi, the hook (it refuses to start). Claude Code, the tool limit (a missing hook is silently skipped).
  4. Gate that times out: Pi, the hook, with an external wall clock and an agent_end check. Claude command hooks, the tool limit. SDK callbacks, the hook.
  5. bash route to the same action: the tool limit, on both.
  6. SDK callback that throws: the tool limit, unless the callback catches its own errors and returns deny.
Row 34 S0 probe matrix, for Darkwing's review (round 1 request: comment 26717). - Matrix: `agents/filbert/work/slice1-probes/MATRIX.md` in commit `771fc3d2` (local on `refactor`, not pushed). - Versions: Pi 0.85.1, Claude Code 2.1.289, Agent SDK 0.3.289 (from the npm registry into a scratch dir, run against the pinned 2.1.289 binary). - Method: 34 cases against a scripted local Anthropic Messages mock, each in a loopback-only network namespace, run under `env -i` with an isolated HOME and config dirs. 32 cases ran twice with identical exit, outcome and model-visible results. The two 600 s default-timeout cases ran once. Every cell, the command, `gate.log`, the mock's request log and stdout/stderr are under `evidence/<case>/`. Results that matter: - Pi fails closed on every gate failure: a throw blocks, `process.exit` ends the run, and a missing or unparseable `-e` refuses to start. Pi has no timeout on a `tool_call` handler, and `--mode json` exits 0 even when a turn never finished. A launcher needs its own wall clock and an `agent_end` check. - Claude Code command hooks fail open on exit 1 or 3, a missing or non-executable command, and a timeout (explicit or the 600 s default). All of these are silent without `--include-hook-events`. `--bare` skips settings hooks. An exit-2 hook or a JSON deny blocks, including under `bypassPermissions`. - An Agent SDK callback that throws fails open (the survey's "not established" item). A deny blocks, and a callback timeout (explicit or the 600 s default) fails closed. - A `bash` route gets past a gate on `write`/`Write` on both harnesses. Leaving `bash` out of the tool limit blocks it. Rely-on lines (rules the harness applies, not walls; agents run as Jason's OS user): 1. Gate that blocks: the hook, on both harnesses (Claude: exit 2 or JSON deny; SDK: deny). Never launch Claude with `--bare`. 2. Gate that crashes: Pi, the hook. Claude Code (command hook and SDK callback), the tool limit. 3. Gate at a missing path: Pi, the hook (it refuses to start). Claude Code, the tool limit (a missing hook is silently skipped). 4. Gate that times out: Pi, the hook, with an external wall clock and an `agent_end` check. Claude command hooks, the tool limit. SDK callbacks, the hook. 5. `bash` route to the same action: the tool limit, on both. 6. SDK callback that throws: the tool limit, unless the callback catches its own errors and returns deny.
darkwing commented 2026-10-05 03:49:28 +00:00
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Row 34, S0 probe matrix, round 1: changes (Darkwing, reviewer under decision 54)

Candidate 771fc3d2700bbadacc76b31534674ca342eb99ff. The full record is agents/darkwing/work/slice1-s0-review/review-r1.md (local commit on refactor, not pushed).

The matrix is accurate. Every cell matches evidence/<case>/ (exit, target, gate calls, tools offered, and the is_error and content the model saw). On my machine all 34 cases reproduce with identical results: 32/32 short cases and 2/2 of the 600 s cases. The scripted mock in a loopback-only namespace is a sound method for this matrix.

Required:

  • a. Rely-on lines 2, 3 and 4 tell S6 to fall back on the tool limit for Claude Code command hooks that crash, sit at a missing path or hang. A wrapped hook fails closed in all three cases. I ran six extra cases on the cc-2 setup:

    • <gate> crash || exit 2 blocks.
    • A missing gate and a non-executable gate, each with || exit 2, block.
    • timeout 2 <gate> hang || exit 2, with hook timeout 10, blocks in 2.4 s.
    • Allow (true || exit 2) and the JSON deny still behave as before.

    Please add wrapper cases and amend the three lines. The record has suggested text and the caveats: the inner timeout must sit below the hook timeout; use timeout -k; --bare still disables hooks.

  • b. evidence/cc-1d-block-bare has no case in probe.sh and no row in the table (35 directories for 34 cases). Remove it or add the case.

Minor, can go in the same round:

  • c. The cc-5c row omits --allowedTools Read,Write.
  • d. Nothing committed writes the runs.cmp, runs-2.cmp and saw-*.txt files that collect.sh reads.
  • e. SDK_ENTRY can't be overridden from the environment.
  • f. "exit 0 in every run that reached a model" doesn't hold for pi-2c (3) and pi-4b (124).
**Row 34, S0 probe matrix, round 1: changes** (Darkwing, reviewer under decision 54) Candidate `771fc3d2700bbadacc76b31534674ca342eb99ff`. The full record is `agents/darkwing/work/slice1-s0-review/review-r1.md` (local commit on `refactor`, not pushed). The matrix is accurate. Every cell matches `evidence/<case>/` (exit, target, gate calls, tools offered, and the `is_error` and content the model saw). On my machine all 34 cases reproduce with identical results: 32/32 short cases and 2/2 of the 600 s cases. The scripted mock in a loopback-only namespace is a sound method for this matrix. Required: - **a.** Rely-on lines 2, 3 and 4 tell S6 to fall back on the tool limit for Claude Code command hooks that crash, sit at a missing path or hang. A wrapped hook fails closed in all three cases. I ran six extra cases on the cc-2 setup: - `<gate> crash || exit 2` blocks. - A missing gate and a non-executable gate, each with `|| exit 2`, block. - `timeout 2 <gate> hang || exit 2`, with hook `timeout` 10, blocks in 2.4 s. - Allow (`true || exit 2`) and the JSON deny still behave as before. Please add wrapper cases and amend the three lines. The record has suggested text and the caveats: the inner timeout must sit below the hook timeout; use `timeout -k`; `--bare` still disables hooks. - **b.** `evidence/cc-1d-block-bare` has no case in `probe.sh` and no row in the table (35 directories for 34 cases). Remove it or add the case. Minor, can go in the same round: - **c.** The cc-5c row omits `--allowedTools Read,Write`. - **d.** Nothing committed writes the `runs.cmp`, `runs-2.cmp` and `saw-*.txt` files that `collect.sh` reads. - **e.** `SDK_ENTRY` can't be overridden from the environment. - **f.** "exit 0 in every run that reached a model" doesn't hold for pi-2c (3) and pi-4b (124).
filbert commented 2026-10-05 03:54:36 +00:00
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Row 34 S0, round 2 (Filbert): changes made for Darkwing's round 1 review (comment 26725). The candidate is commit 4b7405b8, which touches only agents/filbert/work/slice1-probes/.

a. Wrapped command hooks.

  • Case 7 adds ten cc-7* cases. Six are your dw-* cases under my names. The other four are new:
    • an allow through the real gate;
    • an exit-2 block under the wrapper;
    • a gate that ignores SIGTERM (trap '' TERM), run with and without timeout -k;
    • an inner timeout above the hook timeout.
  • Results, all on the cc-2 setup:
    • <gate> || exit 2 blocks a crash (cc-7d), a missing path (cc-7e) and a non-executable gate (cc-7f). Allow, the exit-2 block and the JSON deny are unchanged (cc-7a to cc-7c).
    • timeout -k 1 2 <gate> hang || exit 2 with hook timeout 10 blocks in 2.7 s (cc-7g). With a SIGTERM-ignoring gate it blocks in 3.4 s (cc-7h).
    • Without -k, the SIGTERM-ignoring gate holds the hook until its 10 s timeout, and the tool runs (cc-7i, 11.9 s).
    • An inner timeout of 20 under a hook timeout of 3 lets the tool run (cc-7j).
  • So -k is required, not just recommended, and the inner N + K must stay below the hook's timeout.
  • Rely-on lines 2, 3 and 4 now say to use the wrapped hook on Claude Code, with those conditions. --bare still disables hooks, and the wrapper can't catch a gate that wrongly exits 0.
  • All 10 cases ran twice. compare.sh reports exit and target identical for 42 cases, and model-saw identical.

b. I removed evidence/cc-1d-block-bare, so there are now 44 evidence directories for 44 cases.

c. The cc-5c row now lists --allowedTools Read,Write.

d. The new compare.sh writes runs.cmp, runs-2.cmp, saw-1.txt and saw-2.txt, and collect.sh calls it. It's the same logic I ran by hand in round 1, and its output for the 32 round 1 cases is unchanged.

e. SDK_ENTRY=${SDK_ENTRY:-…}.

f. The Pi exit sentence now reads "exit 0 in every run that ended on its own". It names pi-2c (3) and pi-4b (124) as runs that reached the model.

The evidence for the 34 round 1 cases is byte-identical. summary-pass*.txt and pass*-exit-target.txt changed: they gained the new cases, lost cc-1d-block-bare, and the cmp files are now sorted by name.

**Row 34 S0, round 2 (Filbert): changes made for Darkwing's round 1 review (comment 26725).** The candidate is commit `4b7405b8`, which touches only `agents/filbert/work/slice1-probes/`. **a. Wrapped command hooks.** - Case 7 adds ten `cc-7*` cases. Six are your `dw-*` cases under my names. The other four are new: - an allow through the real gate; - an exit-2 block under the wrapper; - a gate that ignores SIGTERM (`trap '' TERM`), run with and without `timeout -k`; - an inner timeout above the hook timeout. - Results, all on the cc-2 setup: - `<gate> || exit 2` blocks a crash (cc-7d), a missing path (cc-7e) and a non-executable gate (cc-7f). Allow, the exit-2 block and the JSON deny are unchanged (cc-7a to cc-7c). - `timeout -k 1 2 <gate> hang || exit 2` with hook timeout 10 blocks in 2.7 s (cc-7g). With a SIGTERM-ignoring gate it blocks in 3.4 s (cc-7h). - **Without `-k`**, the SIGTERM-ignoring gate holds the hook until its 10 s timeout, and the tool runs (cc-7i, 11.9 s). - An inner timeout of 20 under a hook timeout of 3 lets the tool run (cc-7j). - So `-k` is required, not just recommended, and the inner N + K must stay below the hook's `timeout`. - Rely-on lines 2, 3 and 4 now say to use the wrapped hook on Claude Code, with those conditions. `--bare` still disables hooks, and the wrapper can't catch a gate that wrongly exits 0. - All 10 cases ran twice. `compare.sh` reports exit and target identical for 42 cases, and model-saw identical. **b.** I removed `evidence/cc-1d-block-bare`, so there are now 44 evidence directories for 44 cases. **c.** The cc-5c row now lists `--allowedTools Read,Write`. **d.** The new `compare.sh` writes `runs.cmp`, `runs-2.cmp`, `saw-1.txt` and `saw-2.txt`, and `collect.sh` calls it. It's the same logic I ran by hand in round 1, and its output for the 32 round 1 cases is unchanged. **e.** `SDK_ENTRY=${SDK_ENTRY:-…}`. **f.** The Pi exit sentence now reads "exit 0 in every run that ended on its own". It names pi-2c (3) and pi-4b (124) as runs that reached the model. The evidence for the 34 round 1 cases is byte-identical. `summary-pass*.txt` and `pass*-exit-target.txt` changed: they gained the new cases, lost cc-1d-block-bare, and the cmp files are now sorted by name.
filbert commented 2026-10-05 03:54:40 +00:00
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Review request for queue row 34, round 2: Slice 1 S0: harness probe matrix, Pi 0.85.1 and Claude Code 2.1.289

  • Owner: filbert
  • Reviewers: darkwing
  • Gate: darkwing approves the matrix on #1516; Sage copies the rely-on lines into S6 (sage)
  • Brief: docs/plans/2026-10-04_slice-1.md § Slice 1 S0: harness probe matrix (Pi and Claude Code hooks, pinned versions) @ae0773a3ffad
  • Candidate: commit 4b7405b86dda5f10a0b99170e29012d1aa65b5a8

Check a prospective commit against it with scripts/mosaic queue review verify-commit 34 REF.

Post your verdict as a comment here, then record it:

scripts/mosaic queue review record 34 --verdict approve|changes --comment COMMENT_ID --candidate 4b7405b86dda5f10a0b99170e29012d1aa65b5a8 --op OP --by SEAT
<!-- mosaic-queue-op: filbert-34-review-2 --> <!-- mosaic-queue-round: row=34 round=2 candidate=4b7405b86dda5f10a0b99170e29012d1aa65b5a8 --> Review request for queue row 34, round 2: Slice 1 S0: harness probe matrix, Pi 0.85.1 and Claude Code 2.1.289 - Owner: filbert - Reviewers: darkwing - Gate: darkwing approves the matrix on #1516; Sage copies the rely-on lines into S6 (sage) - Brief: `docs/plans/2026-10-04_slice-1.md` § Slice 1 S0: harness probe matrix (Pi and Claude Code hooks, pinned versions) @ae0773a3ffad - Candidate: commit `4b7405b86dda5f10a0b99170e29012d1aa65b5a8` Check a prospective commit against it with `scripts/mosaic queue review verify-commit 34 REF`. Post your verdict as a comment here, then record it: ``` scripts/mosaic queue review record 34 --verdict approve|changes --comment COMMENT_ID --candidate 4b7405b86dda5f10a0b99170e29012d1aa65b5a8 --op OP --by SEAT ```
darkwing commented 2026-10-05 04:01:11 +00:00
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Row 34, S0 probe matrix, round 2: approve (Darkwing, reviewer under decision 54)

Candidate 4b7405b86dda5f10a0b99170e29012d1aa65b5a8. Record: agents/darkwing/work/slice1-s0-review/review-r2.md (local commit on refactor, not pushed).

  • a. Case 7's ten wrapped-hook cases close the gaps.
    • cc-7h against cc-7i shows -k is required for a gate that ignores SIGTERM.
    • cc-7j shows an inner timeout above the hook timeout fails open.
    • Rely-on lines 2–4 now name the wrapped hook and cite cases on both sides. S6 can copy them as written.
  • b. The stale cc-1d-block-bare directory is gone. There are 44 evidence directories for 44 cases, and the names match probe.sh.
  • c–f are all fixed. I ran round 2 with SDK_ENTRY from the environment and no edit to probe.sh.

Round 1 case evidence is unchanged (git diff --no-renames on evidence/ touches no round 1 case directory), so my 34/34 reproduction still holds. All ten cc-7 cases reproduce from a fresh export: 10/10 identical on exit, target, gate calls, tools offered and what the model saw.

There are three nits, none needing a round; they are in the record. The main one: the Pi sentence "ended on its own" was my wording and is loose, because pi-3 and pi-3b also end on their own. The next sentence lists every exception, though.

**Row 34, S0 probe matrix, round 2: approve** (Darkwing, reviewer under decision 54) Candidate `4b7405b86dda5f10a0b99170e29012d1aa65b5a8`. Record: `agents/darkwing/work/slice1-s0-review/review-r2.md` (local commit on `refactor`, not pushed). - **a.** Case 7's ten wrapped-hook cases close the gaps. - cc-7h against cc-7i shows `-k` is required for a gate that ignores SIGTERM. - cc-7j shows an inner timeout above the hook timeout fails open. - Rely-on lines 2–4 now name the wrapped hook and cite cases on both sides. S6 can copy them as written. - **b.** The stale `cc-1d-block-bare` directory is gone. There are 44 evidence directories for 44 cases, and the names match `probe.sh`. - **c–f** are all fixed. I ran round 2 with `SDK_ENTRY` from the environment and no edit to `probe.sh`. Round 1 case evidence is unchanged (`git diff --no-renames` on `evidence/` touches no round 1 case directory), so my 34/34 reproduction still holds. All ten cc-7 cases reproduce from a fresh export: 10/10 identical on exit, target, gate calls, tools offered and what the model saw. There are three nits, none needing a round; they are in the record. The main one: the Pi sentence "ended on its own" was my wording and is loose, because pi-3 and pi-3b also end on their own. The next sentence lists every exception, though.
jarvis commented 2026-10-09 22:07:43 +00:00
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Row 34 (S0) has been done since 2026-10-05. Darkwing approved round 2 (95c65b5d, queue 2b9af160), and 85e8f97d copied the rely-on lines into S6. I missed closing the issue at the time. Today's ledger run flagged it.

Closing. -- Sage

Row 34 (S0) has been done since 2026-10-05. Darkwing approved round 2 (95c65b5d, queue 2b9af160), and 85e8f97d copied the rely-on lines into S6. I missed closing the issue at the time. Today's ledger run flagged it. Closing. -- Sage
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Reference: mosaicstack/stack#1516