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fix(facts): normalise a tool buffer to an array instead of refusing it - #672
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CLOUD-992 `rows_in` refuses every shape but two, so the agent-sourced fact channel is unusable from any shell tool — normalise to an array instead of making each command project one
Why
The reasoning for that refusal is sound and is not what this row disputes: "Answering But refusing is not the only way to avoid it, and the current choice makes the whole channel unusable from a shell tool. Measured 2026-08-23 on real Bash responses recovered from the capture store (CLOUD-919): every one is raw text, so The fix that was proposed first, and why it is wrongThe obvious patch is to make the declared command project an array —
The fixNormalise to an array in the engine, then count. The count is still the whole answer and no byte of the buffer is stored, so rule 4 is untouched — what changes is that fewer shapes are unreadable:
The invariant worth stating, because it is the one that must not regress: no unread shape is ever reported as The last row is the interesting one and it is deliberately not Refinement — Ready Refinement gate: Definition of Ready & Done. This body carries only specializations.
Acceptance
Found while measuring CLOUD-859's stated precondition, from a fleet-wide symptom: the review gate cannot be built while the channel refuses every shell buffer. |
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Inline comments:
In `@crates/batten/src/facts.rs`:
- Around line 1595-1603: The array handling in the serde_json::Value::Array
branch must validate that every item is a supported text content block before
applying envelope semantics. Update the blocks/envelope check around
is_text_block so mixed arrays such as a text-shaped object plus an ordinary row
return items.len(), while preserving envelope behavior only for arrays whose
complete contents are valid content blocks.
In `@crates/batten/tests/agent_facts.rs`:
- Around line 181-196: Add a test case in a new or existing rows_in-focused test
that passes a content-block envelope containing two text blocks with JSON arrays
whose lengths sum to three, and assert that rows_in returns Look::Is(3).
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…lock
The normalisation selected content-block semantics whenever ANY item in the
array was a text block, then read the blocks and dropped everything else. So
`[{"type":"text","text":"[]"},{"id":1}]` — a two-row array — answered
`Is(0)`: the exact fail-closed collapse `rows_in` exists to prevent, produced
by the code meant to prevent it.
A row that merely looks like a content block is an ordinary row. A tool
emitting `{"type":"text", …}` records is not thereby emitting an envelope, and
nothing about one such row licenses ignoring its siblings. So the array arm
takes the envelope path only when every item is a content block, and counts
its items otherwise. The empty array is checked first, because `all` is
vacuously true over nothing and would have sent `[]` into the aggregation loop
to come back could-not-look instead of the genuine zero it is.
Two tests, both shown able to fail:
* `a_mixed_array_is_a_row_array_and_never_an_envelope` — the counterexample
itself, plus the reversed order, plus a one-item envelope to prove the
narrowing did not cost the shape an MCP tool actually returns. Restoring the
`any` selection turns it red.
* the aggregation assertion inside
`a_shell_buffer_carrying_json_is_counted_without_the_command_projecting_it`
— two text blocks of two and one rows summing to three. Changing `rows +=`
to `rows =` turns it red; nothing caught that before.
Found by review on PR #672 before the branch was readied, which is the second
time this session that reading the review ahead of CI caught a real defect —
this one in the invariant the change's own message asserts.
Refs: CLOUD-992
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Inline comments:
In `@crates/batten/src/facts.rs`:
- Around line 1607-1608: The envelope-selection logic around is_text_block must
require every text block to contain a string text field; malformed blocks should
remain ordinary array rows. After filter_map and rows_in_text processing, return
Look::CouldNotLook whenever any envelope text is missing, non-string, empty, or
whitespace-only, rather than recording a zero-row fact. Add regressions covering
malformed text fields and whitespace-only text.
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`rows_in` read exactly two shapes — a bare row array and a content-block envelope whose text parsed as an array — and answered `CouldNotLook` for everything else. That put the burden on every declared command to project its own output into an array before the engine would count it, so a `gh … --json` fact had to carry `--jq '[…]'` to be readable at all. Measured on six real captures, every Bash tool buffer arrives as raw text, so the projection requirement is not an edge case: it is the common path. Normalise instead. A JSON array counts its elements; a single JSON value is one element, wrapped; text that is not JSON is one opaque row. The invariant the old refusal protected is preserved exactly — no shape that said something is ever reported as `0`, so a `rows == 0` predicate stays fail-closed — and `CouldNotLook` survives in the one place it is the only honest answer: a buffer that is absent, empty, or whitespace, where `0` would pass an unreviewed head and `1` would deny a gate forever. The helper returns `Option<usize>` rather than `Look<usize>`: a count has two outcomes, and `Look::IsNot` is not one of them. Returning `Look` would put an unreachable arm on the caller, and a wildcard over it is how a future third outcome gets silently folded into "nothing to add". Each of the six table rows is shown able to fail: mutating it turns the suite red — array length, opaque text as zero, empty text as zero, the scalar refusal, the bare-string refusal, and `Null` read as a reading. A tool that cannot emit parseable JSON wants an adapter, not this fallback; the one-opaque-row reading keeps a gate fail-closed meanwhile and the inventory is CLOUD-993. Refs: CLOUD-992
…lock
The normalisation selected content-block semantics whenever ANY item in the
array was a text block, then read the blocks and dropped everything else. So
`[{"type":"text","text":"[]"},{"id":1}]` — a two-row array — answered
`Is(0)`: the exact fail-closed collapse `rows_in` exists to prevent, produced
by the code meant to prevent it.
A row that merely looks like a content block is an ordinary row. A tool
emitting `{"type":"text", …}` records is not thereby emitting an envelope, and
nothing about one such row licenses ignoring its siblings. So the array arm
takes the envelope path only when every item is a content block, and counts
its items otherwise. The empty array is checked first, because `all` is
vacuously true over nothing and would have sent `[]` into the aggregation loop
to come back could-not-look instead of the genuine zero it is.
Two tests, both shown able to fail:
* `a_mixed_array_is_a_row_array_and_never_an_envelope` — the counterexample
itself, plus the reversed order, plus a one-item envelope to prove the
narrowing did not cost the shape an MCP tool actually returns. Restoring the
`any` selection turns it red.
* the aggregation assertion inside
`a_shell_buffer_carrying_json_is_counted_without_the_command_projecting_it`
— two text blocks of two and one rows summing to three. Changing `rows +=`
to `rows =` turns it red; nothing caught that before.
Found by review on PR #672 before the branch was readied, which is the second
time this session that reading the review ahead of CI caught a real defect —
this one in the invariant the change's own message asserts.
Refs: CLOUD-992
…ondemns the envelope
Two more ways a partly-unreadable buffer came back as a count, both the same
invariant break as the mixed-array case and neither caught by its fix.
`is_text_block` keyed on `type` alone, so `{"type":"text","text":7}` was
admitted as a block. The envelope loop then met a block whose `text` was not a
string, and the `filter_map` over that field silently dropped it — so
`[{"type":"text","text":"[]"},{"type":"text","text":7}]` answered `Is(0)` for a
buffer half of which was never read, and `record_agent_fact` would have stored
that zero as a fact.
Fixed where it is decided rather than where it is noticed: a string `text` is
part of the block's shape. That also decides it in the more useful direction —
a malformed block is not a content block, so its array is not an envelope and
counts as ordinary rows. Two rows is what that buffer carries, and saying so
beats refusing it.
With the shape tightened the loop can no longer drop anything, so it stops
pretending it might: an explicit `else { return CouldNotLook }` per block
replaces the filter, on the axis the shape check cannot reach. Every item may
be a well-formed block and one of them still say nothing — an empty or
whitespace `text` — and folding that in as `0` would be a guess presented as a
reading. So one unreadable block condemns the whole envelope, which is also
what keeps the single-empty-block case could-not-look as it has always been.
Both shown able to fail: keying `is_text_block` on `type` alone turns
`a_mixed_array_is_a_row_array_and_never_an_envelope` red, and restoring the
skip turns `one_unreadable_block_condemns_the_whole_envelope` and
`only_an_absent_or_empty_buffer_is_could_not_look` red together.
Third real finding this review round on one function, each a distinct way to
report a count over bytes nobody read. Reading the review before the ready is
paying for itself three times over on this branch alone.
Refs: CLOUD-992
…elope
CLOUD-992's acceptance is that the fact channel becomes usable from a shell
tool. Normalising buffers did not achieve it, and the reason is one level above
every shape the table described: Claude Code hands a Bash call's response back
as an OBJECT — `{stdout, stderr, …}` — so `rows_in` never receives the stdout
text as a buffer at all. Counting the object gave `1` for every shell command
ever declared, whatever it printed.
MEASURED, through the real hook rather than reasoned about. A `[[fact]]` row
declaring `printf '[1,2,3]\n'`, run on the mediated path, wrote `rows 1`. With
this change the same probe writes `rows 3`. That measurement is also what
closes CLOUD-859's standing residual unknown: the envelope's shape had been
inferred from response bytes, never observed, and the inference was wrong in
the direction that mattered.
No buffer-shaped test could have caught this, which is the lesson worth keeping:
every case in the suite passed a buffer, and the buffer was never the value
under test.
The shape is `capture::decode_response`'s to state, not this function's. It
already reads `stdout` then `stderr` in a declared order, already says so
against the measured corpus, and is already the reader the capture store
trusts. A second copy of that field list here is the two-copies-drifted
failure this repository keeps recording, so this defers to it.
Three properties held deliberately:
* an object with no readable stream member is NOT an envelope — it is a single
JSON row, and stays one element wrapped;
* an empty stdout is could-not-look, not zero, so `rows == 0` keeps meaning
"the command looked and found none" rather than "nobody looked" — which is
what a review gate's predicate rests on;
* bytes that are not UTF-8 are a shape this build did not read, never a buffer
that carried nothing.
Refs: CLOUD-992
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What
facts::rows_inread exactly two buffer shapes and answeredCouldNotLookfor everything else, so every declared[[fact]]command had to project its own output into an array before the engine would count it. CLOUD-992's acceptance is that the agent-sourced fact channel become usable from a shell tool.The correction that matters, and it landed mid-review
This PR's first two commits normalised buffers and its body claimed that made a
gh … --jsonfact countable. Measured, that was false, and the measurement is now the interesting part of the change.With a real
[[fact]]row declaringprintf '[1,2,3]\n', run on the mediated path so the live hook wrote the record:458d6edrows 1458d6edrows 3The reason is one level above every shape the table described: Claude Code hands a Bash call's response back as an object —
{stdout, stderr, …}— sorows_innever received the stdout text as a buffer at all. Counting the object gave1for every shell command ever declared, whatever it printed. Normalising buffers was necessary and not sufficient, because the buffer never arrived as one.capture.rs:357already stated that shape against the measured corpus. So the envelope arm defers tocapture::decode_responserather than restating its field list — one authority, not two that can drift.No buffer-shaped test could have caught this, which is the lesson worth keeping: every case in the suite passed a buffer, and the buffer was never the value under test.
a_shell_tools_buffer_is_a_member_of_its_envelope_and_is_counted_thereis the case that would have.This also closes a residual unknown that had blocked CLOUD-859 across two sessions: the envelope's shape had been inferred from response bytes and never observed, and the inference was wrong in the direction that mattered.
The table
{stdout, stderr})1— one element, wrapped11— one opaque rowValue::NullThe invariant is preserved throughout: no buffer that said something is ever reported as
0, so arows == 0predicate stays fail-closed.CouldNotLooksurvives exactly where it is the only honest answer — nothing printed at all, where0would pass an unreviewed head and1would deny a gate forever.Two more real defects the review caught, both the same invariant
Both found in the free draft phase, before the ready spent a matrix.
[{"type":"text","text":"[]"},{"id":1}]— two rows — answeredIs(0). Now an array is an envelope only when every item is one.textsilently skipped.is_text_blockkeyed ontypealone, so{"type":"text","text":7}was admitted and then dropped by afilter_map, reporting the sum of the rest as the total. A stringtextis now part of the shape, and the loop can no longer skip anything.Shown able to fail
Nine mutations, one per table row, each turning
agent_factsred. No survivors. The envelope arm included: counting the object instead of its stream member turnsa_shell_tools_buffer_is_a_member_of_its_envelope_and_is_counted_therered.Still required, and not to be "simplified" away later
The declared command must still project to an array. That is now a semantic requirement, not a parsing one:
gh api graphqlreturns an object, whose stdout text is a JSON object, which normalises toIs(1)regardless of what the query found. The--jq '[…]'is what makes the count mean one element per blocking condition.Not in scope, filed instead
A tool that cannot emit parseable JSON wants an adapter, not the one-opaque-row fallback. The inventory is CLOUD-993. The remaining constraints on CLOUD-859's own command — byte-equality forbidding a PR number, and
gh pr view --jsonhaving noreviewThreadsfield — are written onto that row.Closes CLOUD-992