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fix: close 48-pt LoCoMo accuracy gap with 5 plugin hook fixes (re-targeted to main)#64

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fix/index-md-include-sessions
Apr 21, 2026
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fix: close 48-pt LoCoMo accuracy gap with 5 plugin hook fixes (re-targeted to main)#64
efenocchi merged 43 commits intomainfrom
fix/index-md-include-sessions

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Summary

Five bug fixes to the pre-tool-use hook and shell bundle that close the 48-point accuracy gap between the local-files LoCoMo baseline and the cloud baseline on a sessions-only Deeplake workspace.

Stacked on top of optimizations (PR #61). Keeps Davit's grep refactor, adds five independent fixes plus 44 unit/integration tests that fail if any fix regresses.

Headline numbers

100-QA LoCoMo run, deterministic first-100 QAs from locomo10.json, Haiku model, Gemini judge via openrouter/google/gemini-2.5-flash. Sessions-only workspace locomo_benchmark/baseline (272 raw sessions in sessions, memory table dropped).

Run Fixes Accuracy Gap to local (75.0%)
baseline_cloud (original, reference) none 27.0% −48.0 pt
baseline_cloud_100qa_fix123 #1 + #2 + #3 67.5% −7.5 pt
baseline_cloud_100qa_fix12345 #1 + #2 + #3 + #4 + #5 68.0% −7.0 pt
baseline-100-subset (local, no plugin) n/a 75.0%

Per-category accuracy (full 100-QA runs)

Cat Label n Pre-fix +fix 1–3 +fix 1–5
1 single-hop 32 15.6% 42.2% 50.0%
2 temporal 37 36.5% 81.1% 85.1%
3 multi-hop 13 23.1% 69.2% 61.5%
4 open-domain 18 30.6% 83.3% 69.4%

Signal quality at the tool boundary

Signal Pre-fix +fix 1–3 +fix 1–5
[deeplake-sql] lines in tool_result 35+ 0 0
"path must be of type string" errors 60+ 0 0
Read-tool calls that succeeded 0 201 ~250
(no matches) on conv_N_session_*.json globs many 19 QA × 3+ much lower

The five fixes

#1/index.md lists session files too (4271baf)

Bug: the virtual /index.md was generated from the memory table only (WHERE path LIKE '/summaries/%'). In workspaces where that table was empty or dropped (e.g. locomo_benchmark/baseline), the index reported 0 sessions: or 1 sessions: even when the sessions table had 272 rows. Claude concluded memory was empty and gave up.

Fix: buildVirtualIndexContent(summaryRows, sessionRows) now renders both under ## Summaries / ## Sessions sections with a combined header (273 entries (1 summaries, 272 sessions):). The fallback path in readVirtualPathContents queries both tables in parallel and passes both sets to the builder.

Files: src/hooks/virtual-table-query.ts.
Tests: claude-code/tests/virtual-table-query.test.ts adds four cases covering the regression, the backwards-compatible single-arg call, and the empty case. claude-code/tests/pre-tool-use-baseline-cloud.test.ts drives the full processPreToolUse flow against a 272-row fixture and asserts the synthesized index contains every real session path.

#2 — Read-tool intercepts return file_path, not command (4c5d50b)

Bug: the hook's updatedInput was always Bash-shaped ({command, description}). When the incoming tool was Read, Claude Code's Read implementation looked for updatedInput.file_path, found undefined, and crashed with "The 'path' property must be of type string, got undefined". On the pre-fix sessions-only 100-QA run, every memory-path Read call hit this error (9 / 9 tracked cases); on the plugin-v8-optimizations-100 run, 60 / 100 transcripts contained the error.

Fix: extended ClaudePreToolDecision with an optional file_path field. For Read-tool intercepts, the plugin materializes the fetched content via writeReadCacheFile(sessionId, virtualPath, content) into ~/.deeplake/query-cache/<sessionId>/read/<virtualPath> and returns a decision with file_path set. main() dispatches on file_path: if present, emits updatedInput: {file_path}; otherwise keeps the historical {command, description}. Bash / Grep / Glob paths are unchanged.

Files: src/hooks/pre-tool-use.ts.
Tests: pre-tool-use-baseline-cloud.test.ts now asserts Read intercepts produce a decision with file_path, with content captured through a stubbed writeReadCacheFileFn. hooks-source.test.ts cases updated to match.

#3 — Shell bundle silences [deeplake-sql] trace in one-shot mode (35a7e87)

Bug: Claude Code's Bash tool merges a child process's stderr into the tool_result string the model sees. The shell bundle, when invoked as node shell-bundle -c "…" from the pre-tool-use hook, wrote [deeplake-sql] query start: … lines to stderr whenever HIVEMIND_TRACE_SQL / HIVEMIND_DEBUG was set — which in CI / dev shells was frequently the case. The model saw SQL log noise instead of grep output; on the original baseline_cloud-100 run, 35+ trace lines leaked across the transcripts.

Fix: two parts.

  1. Move the TRACE_SQL / DEBUG_FILE_LOG checks in src/deeplake-api.ts out of module-level constants and into the traceSql function body so callers can flip the env vars at runtime.
  2. In src/shell/deeplake-shell.ts, when the bundle detects one-shot mode (-c in argv), delete process.env[…] for HIVEMIND_TRACE_SQL, DEEPLAKE_TRACE_SQL, HIVEMIND_DEBUG, DEEPLAKE_DEBUG before opening any SQL connection. Interactive REPL mode keeps the env untouched.

Files: src/deeplake-api.ts, src/shell/deeplake-shell.ts.
Tests: claude-code/tests/shell-bundle-sql-trace-silence.test.ts spawns the shipped bundle with the trace vars set, points it at an unreachable API, and asserts stderr is free of [deeplake-sql]. Source-level check confirms traceSql reads env at call time, not at module load.

#4LIKE clauses that consume sqlLike() output use ESCAPE '\' (3d15454)

Bug: sqlLike(value) escapes _ and % by prefixing them with \ so callers can safely interpolate user-controlled strings into LIKE 'pattern' literals. But the Deeplake backend does not treat backslash as the LIKE escape character by default — without an explicit ESCAPE '\' clause, \_ is matched as two literal characters instead of a literal _. Every query whose path or filename contained _ (e.g. /sessions/conv_0_session_N.json) silently returned zero rows.

Observed in the wild: grep "adoption agency" ~/.deeplake/memory/sessions/conv_0_session_*.json returned (no matches) even though "adoption agency" is in the file — the LIKE pattern /sessions/conv\_0\_session\_%.json never matched any real path.

Fix: append ESCAPE '\' to every LIKE '...' clause that is fed from sqlLike(). Covers:

  • src/shell/grep-core.ts:buildPathCondition (wildcard-path and directory-prefix branches).
  • src/hooks/virtual-table-query.ts:buildDirFilter (per-directory filters used by listVirtualPathRowsForDirs).
  • src/hooks/virtual-table-query.ts:findVirtualPaths (memory- and sessions-table branches, path and filename clauses).

The Codex and Claude Code find fallbacks and bash-command-compiler's find_grep segment call through to findVirtualPaths and inherit the fix without a local change.

Files: src/shell/grep-core.ts, src/hooks/virtual-table-query.ts.
Validation: focused 15-QA subset run (baseline_cloud_15qa_fix4) on the 15 regressions where local=1 and cloud<1 after fix #1+#2+#3. Pre-fix-4: 1.5 / 15 pts. Post-fix-4: 13.0 / 15 pts, ties the local score exactly. 14 / 15 QAs improved, 1 stayed partial, 0 regressed.

#5 — Cap plugin tool output at 8 KB (2c0d65d)

Bug: Claude Code's Bash tool silently persists any tool_result larger than ~16 KB to disk and replaces it with a 2 KB preview plus a path to the persisted file. In the baseline_cloud_100qa_fix123 run, 11 of 14 losing QAs that hit this path never read the persisted file — the 2 KB preview was too small to carry the answer and the model gave up.

Typical triggers: grep -r Caroline /home/.deeplake/memory/ (Caroline appears in nearly every session → 66 KB of dialogue), for f in /…/sessions/conv_0_session_*.json; do grep …; done (926 KB of concatenated output through the slow-path shell bundle).

Fix: src/utils/output-cap.ts exports capOutputForClaude(output, {kind}). If the output fits under 8 KB (CLAUDE_OUTPUT_CAP_BYTES) it is returned unchanged; otherwise it is truncated at the last line boundary that fits under the cap, and a short footer is appended:

... [grep truncated: 313 more lines (58.4 KB) elided — refine with '| head -N' or a tighter pattern]

The footer names the operation (grep / cat / ls / find / bash) and gives the model a concrete next step. The cap is applied on every plugin exit path that can produce a Bash-tool result:

  • grep-direct.ts:handleGrepDirect (grep output)
  • bash-command-compiler.ts:executeCompiledBashCommand (final concatenation of compiled segments)
  • pre-tool-use.ts direct read (cat / head / tail), ls, and find fallbacks

Read-tool intercepts are unaffected: they write content to disk and return a file_path, so no Claude Code preview truncation applies.

Files: src/utils/output-cap.ts, src/hooks/grep-direct.ts, src/hooks/bash-command-compiler.ts, src/hooks/pre-tool-use.ts.
Tests: claude-code/tests/output-cap.test.ts (8 cases) covers the no-op path, line-boundary truncation, single-oversized-line path, custom maxBytes, the default footer kind, and a realistic 400-line grep fixture that exceeds 16 KB and gets capped strictly between 4 KB and 8 KB.

Test coverage

44 unit and integration tests across four files, all passing:

  • claude-code/tests/virtual-table-query.test.ts — 21 tests. Covers fix initial virtual fs implementation #1 at the builder level and the readVirtualPathContents fallback (both branches of the "memory empty" / "sessions empty" matrix). Asserts the exact SQL shape per branch.
  • claude-code/tests/pre-tool-use-baseline-cloud.test.ts — 13 tests. Real-QA-anchored integration tests driving processPreToolUse against a workspace mock with 272 session rows. Every case mirrors a concrete LoCoMo QA from the benchmark (conv 0 / qa 3, 6, 25, 29, 46). Asserts fix initial virtual fs implementation #1 and fix Feature/enriched capture #2 at the entry point; one dedicated test for Read against a /sessions/<file>.json path (not just /index.md).
  • claude-code/tests/shell-bundle-sql-trace-silence.test.ts — 2 tests. Bundle-level regression guard for fix Feature/integrate hook #3.
  • claude-code/tests/output-cap.test.ts — 8 tests. Byte-accurate truncation assertions for fix Feature/e2e test #5.

Each fix was independently verified by stashing the source change and re-running the relevant test file — every source-stash produces a failing test that pinpoints the regression. Verification notes live in the individual commit messages.

Non-determinism caveat (honest)

Haiku and the Gemini judge introduce run-to-run variance that is much larger than the signal we're measuring at 100-QA scale. On the full 100-QA set, the fix 1+2+3+4+5 run scored 68.0 % vs fix 1+2+3's 67.5 % — a 0.5-point net delta. This is not proof that fixes #4 and #5 are net-zero at that scale.

The decisive evidence is in the focused subsets:

  • Fix Feature/js sdk integration #4's 15-QA regression subset: 1.5 → 13.0 / 15 pts, a +76.7 pp swing. Every improved QA used an underscored glob that was previously silently returning zero rows.
  • Fix Feature/e2e test #5 verified empirically: grep -r Caroline /home/.deeplake/memory/ went from ~66 KB of output truncated to a 2 KB preview (Claude rarely recovered) to a capped 7.9 KB chunk with a footer reporting 313 elided lines.

A 14-QA re-run on an identical fix state produced 14.3 % in one run and 53.6 % in another — a 39-point swing from pure Haiku + judge non-determinism. In other words, a single 100-QA run carries ±3–4 points of noise, and the +0.5 pt cross-run delta is well inside that band. The true effect of fixes #4 and #5 on the full 100 is masked by the noise; the per-fix subset tests are the honest measurement.

Plugin workspace cross-check

Same build, same 100-QA set, but against locomo_benchmark/plugin (272 summaries + 272 sessions) instead of the sessions-only baseline workspace:

Workspace Fixes Accuracy
locomo_benchmark/baseline (sessions only) #1#5 68.0 %
locomo_benchmark/plugin (sum + ses) #1#5 70.5 %

Davit's pre-fix plugin-v8-optimizations-100 scored 71.0 % on the canonical 45+55 subset against the same plugin workspace. The fix 1–5 build on the different first-100 subset is statistically indistinguishable.

The +2.5 pt from adding summaries is smaller than Davit's observed +11 pt (v8 baseline-workspace → v8 optimizations) because fixes #1#3 already close most of the sessions-only gap: with the raw-session path working, the summaries are no longer compensating for retrieval-path bugs.

Full analysis lives in deeplake-cli-locomo-benchmark_plugin/results/ablation_cloud_plugin_fixes.md (benchmark repo).

Reproduction

# Point the Hivemind CLI at the sessions-only baseline workspace.
hivemind org switch locomo_benchmark
hivemind workspace baseline

# Benchmark.
cd deeplake-cli-locomo-benchmark_plugin
rm -rf ~/.deeplake/query-cache/
env -u HIVEMIND_TRACE_SQL -u DEEPLAKE_TRACE_SQL -u HIVEMIND_DEBUG -u DEEPLAKE_DEBUG \
  PLUGIN_DIR=/…/worktrees/davit_pr/claude-code \
  DEEPLAKE_CAPTURE=false HIVEMIND_CAPTURE=false \
  bun scripts/run-benchmark.ts \
    --table sessions --limit 100 --run-id <run-id> \
    --concurrency 10 --timeout 180 --log-tools

Test plan

  • npm run build succeeds (8 Claude Code + 8 Codex + 1 OpenClaw bundles).
  • npx vitest run claude-code/tests/virtual-table-query.test.ts claude-code/tests/pre-tool-use-baseline-cloud.test.ts claude-code/tests/shell-bundle-sql-trace-silence.test.ts claude-code/tests/output-cap.test.ts — 44 / 44 pass.
  • End-to-end benchmark on locomo_benchmark/baseline reaches 68.0 % (vs 27.0 % pre-fix, vs 75.0 % local).
  • Plugin-workspace cross-check reaches 70.5 %.
  • Every fix has a regression test that fails if the source change is stashed.
  • Reviewer smoke-check: reproduce the fix4 15-QA regression subset run on a fresh checkout.
  • Optional follow-ups tracked separately (not in this PR): BM25 via content_text <#> for pattern-variation robustness; ORDER BY inside grep-core.ts:searchDeeplakeTables subqueries to remove the remaining plugin-side non-determinism from LIMIT 100.

davidbuniat and others added 30 commits April 17, 2026 23:11
… check

Refactor the hot-path session-start and capture hooks to do less synchronous
network work, and introduce a disk-backed write queue so per-event inserts
no longer block the user.

Highlights:
- New src/hooks/session-queue.ts: append-only JSONL queue per session with
  inflight rename, stale recovery, batched INSERT flush, and auth-failure
  disable state. Flushed on Stop/SubagentStop and SessionEnd.
- src/hooks/capture.ts now enqueues rows locally instead of issuing one
  INSERT per event; flush happens at turn boundaries.
- src/hooks/session-start.ts slimmed to local-only work (credentials +
  context injection). All network work (table setup, placeholder row,
  queue drain, version check, auto-update) moved to session-start-setup.ts.
- New src/hooks/version-check.ts with cached latest-version lookup (TTL)
  so we don't hit GitHub on every session start.
- New src/virtual-path-scope.ts centralizes /sessions/ vs memory routing;
  pre-tool-use and grep-core consult it for ls/find/grep scoping so
  sessions and memory are queried in parallel only when the path covers
  both.
- grep-core gains a regex literal prefilter helper so content scans can
  still leverage a LIKE anchor when a safe substring exists.
- Matching changes on the codex side (capture/pre-tool-use/session-start/
  session-start-setup/stop) and regenerated bundles for both plugins.
- Tests: new session-queue.test.ts and version-check.test.ts; updates to
  session-start, grep-core, grep-interceptor, deeplake-api, and codex
  integration tests.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
…s, requeue race

- session-queue: escape backslashes before single quotes so JSON payloads
  survive SQL backends with standard_conforming_strings=off.
- version-check: strip pre-release tags before Number() so 1.2.3-beta
  compares deterministically instead of collapsing to NaN.
- session-queue: requeueInflight now appends inflight content via
  appendFileSync unconditionally, removing the existsSync→renameSync
  TOCTOU window where a concurrent capture append could be overwritten.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
The virtual /index.md served from the Deeplake-backed memory path was
only listing rows from the `memory` table (summaries), so in workspaces
where the memory table is empty or has been dropped (e.g.
locomo_benchmark/baseline) the index falsely reported "0 sessions" /
"1 sessions" even when the `sessions` table held hundreds of rows.
Agents reading the index would conclude memory was empty and give up on
retrieval.

Extend `buildVirtualIndexContent` to accept both summary and session
rows and render them under `## Summaries` and `## Sessions` sections,
with a combined header like `273 entries (1 summaries, 272 sessions):`.
Update the fallback branch in `readVirtualPathContents` to query both
tables in parallel and pass the results to the new builder.

Verified against the locomo baseline benchmark: the same three QAs that
previously saw a 1-entry index (conv 0 / qa 6, 25, 46) now receive the
full listing on the fast-path cat index.md call, and the generated
index matches the 272 sessions ingested into the baseline workspace.
Lock in the fix that made `buildVirtualIndexContent` aware of session
rows and the fallback path in `readVirtualPathContents` query both
tables when /index.md has no physical row.

New unit tests for `buildVirtualIndexContent`:
- renders both sections with a combined "N entries (X summaries, Y
  sessions):" header when both tables have rows, with Summaries listed
  before Sessions
- renders only sessions when the memory table is empty (guards the
  baseline_cloud regression where the old output reported "0 sessions:"
  despite 272 rows in the sessions table)
- stays backwards-compatible for callers that pass only summary rows
- produces a well-formed empty index when both inputs are empty

New integration tests for `readVirtualPathContents`:
- when /index.md has no physical row, the fallback issues three queries
  (union for exact paths + two parallel fallback queries) and each
  fallback targets the correct table and LIKE filter
- the synthesized index still renders summaries if the sessions-table
  fallback query rejects

One existing test (`reads multiple exact paths in a single query and
synthesizes /index.md when needed`) was updated to expect three calls
instead of two, matching the new dual-table fallback behavior.
…al QAs

Adds integration coverage for the three LoCoMo QAs that cloud baseline
got wrong before the /index.md fix landed (conv_0 questions 6, 25, 46):

- qa_6  : "When is Melanie planning on going camping?" (gold: June 2023)
- qa_25 : "When did Caroline go to the LGBTQ conference?" (10 July 2023)
- qa_46 : "Would Melanie be considered an ally..." (Yes, she is supportive)

Each QA is driven through `processPreToolUse` twice — once via the
Read-tool intercept (`Read /home/.deeplake/memory/index.md`) and once
via the Bash intercept (`cat /home/.deeplake/memory/index.md`) — against
a DeeplakeApi mock that mirrors the real sessions-only baseline
workspace at the time of the regression (memory table empty, 272 rows
across conv_0..9 in the sessions table). The assertions verify the
synthesized index reports "272 entries (0 summaries, 272 sessions):",
contains the specific session file each QA needed (conv_0_session_2 for
the camping date, conv_0_session_7 for the conference, conv_0_session_10
for the ally question), and does not regress to "0 sessions:" or
"1 sessions:" headers.

The suite also exercises the pure builder and the
`readVirtualPathContents` fallback against the same 272-row fixture so
the regression is caught at the unit, integration, and entry-point
boundaries.

Tests run hermetically by stubbing the disk-backed session cache so
they do not read or write ~/.deeplake/query-cache/.

Verified by temporarily reverting the fix on virtual-table-query.ts:
all eight assertions fail without the fix (0 sessions: header, missing
session paths), then pass cleanly once the fix is restored.
Claude Code hooks replace the tool input with whatever `updatedInput`
they emit. The pre-tool-use hook was always emitting
`{command, description}` — the Bash-tool shape — even when the incoming
tool was Read. The Read implementation then read `updatedInput.file_path`,
found `undefined`, and crashed with:

    "The 'path' property must be of type string, got undefined"

Claude wasted a turn (or more) recovering by re-issuing the read as a
Bash `cat`. In the plugin-v8-optimizations-100 run (memory table
populated, 272 summaries), 60 / 100 transcripts contained this error.
In the sessions-only baseline_cloud run it was even worse because the
recovery path hit fix #1's `/index.md` bug on top.

The fix teaches the hook to materialize Read intercepts into a real
file on disk and return the path:

  - Add an optional `file_path` field to ClaudePreToolDecision. When
    present, main() emits `updatedInput: {file_path}` instead of the
    Bash-shaped `{command, description}`.
  - Add `writeReadCacheFile(sessionId, virtualPath, content)` which
    writes into `~/.deeplake/query-cache/<sessionId>/read/<virtualPath>`,
    mirroring the per-session cache the index already uses. Cleanup
    reuses the existing session-end path.
  - Add `buildReadDecision(file_path, description)` so the call site is
    explicit about the Read-tool shape.
  - Branch in the direct-read code path: when `input.tool_name ===
    "Read"`, write the fetched content via `writeReadCacheFile` and
    return `buildReadDecision(...)`. Bash cat / head / tail / wc keep
    their existing `echo <content>` shape.
  - Thread `writeReadCacheFileFn` through the existing deps so tests
    can stub it and stay hermetic.

Test updates:
  - `hooks-source.test.ts > reuses cached /index.md content ...` now
    asserts `directDecision?.file_path` instead of `.command` for the
    Read variant, with a stubbed cache writer that captures the written
    content.
  - `hooks-source.test.ts > uses direct grep, direct reads, listings ...`
    updated the Read assertion the same way.
  - `pre-tool-use-baseline-cloud-3qa.test.ts` Read cases now assert
    that the decision carries `file_path` (bug #2 guard) while the Bash
    cases confirm `command` still exists (bash shape preserved).
    Verified: stashing the fix causes all three Read-tool per-QA tests
    to fail; restoring the fix makes them pass.

End-to-end verified against locomo_benchmark/baseline (272 sessions,
memory dropped) on a 5-QA subset spanning conv 0 questions 6 / 25 / 29
/ 46 / 62 — five QAs that baseline-local answered correctly and the
original baseline_cloud run got wrong. Post-fix run: 5 / 5 correct,
0 occurrences of "property must be of type string" across the five
transcripts. (Haiku happened to pick Bash over Read for each QA in
this run, so the Read intercept didn't fire in-flight; the unit tests
and the earlier fix1b transcript where Read was attempted cover that
path.)
…ons/* Read

Extends the integration test suite for fix #1 and fix #2 with two more
QAs — qa_3 (Caroline's research) and qa_29 (Melanie's pottery workshop)
— bringing the REAL_QAS pool to five. qa_3 specifically maps to the
Read calls that fired in the `baseline_cloud_9qa_read_candidates_fix2`
benchmark run (three Read calls, all against memory paths), so its
inclusion anchors the test suite against live behavior observed on the
sessions-only `locomo_benchmark/baseline` workspace.

Adds a dedicated test for the other Read-tool regression surface: a
Read against a /sessions/<file>.json path (not only /index.md). The
same benchmark run showed haiku calling
`Read /home/.deeplake/memory/sessions/conv_0_session_{1,2}.json`
directly; the new test feeds that exact shape through
`processPreToolUse`, asserts the decision carries `file_path` (not
`command`), and verifies the session JSON body is materialized to the
read cache at the expected virtual path.

Renames the test file from `pre-tool-use-baseline-cloud-3qa.test.ts`
to `pre-tool-use-baseline-cloud.test.ts` now that it covers more than
three QAs.

Verification: 13 / 13 tests pass; temporarily stashing the fix #2
source change makes the new per-QA Read assertions and the /sessions
Read assertion all fail (decision.file_path is undefined), restoring
the source brings them back to green.
Claude Code's Bash tool merges the child process's stderr into the
tool_result string the model sees. When a user or CI had
HIVEMIND_TRACE_SQL=1 or HIVEMIND_DEBUG=1 exported, every SQL query
issued by the shell bundle during `node shell-bundle -c "..."` wrote
a `[deeplake-sql] query start:` line to stderr — and all of it landed
in Claude's view of the command output, drowning out the real data.

Confirmed on the original baseline_cloud-100 run: 35+ trace lines
across the transcripts, interleaved with the bash command results
Claude was trying to parse. In several QAs the SQL noise replaced the
useful output entirely (exit code 1 + trace lines → Claude concluded
"no matches").

Two-part fix:

  1. Move the TRACE_SQL / DEBUG_FILE_LOG env checks out of the top-level
     module constants in `src/deeplake-api.ts` and into the `traceSql`
     function body. The check now evaluates per-call, so callers that
     import the SDK can still flip the env vars at runtime. (Previously
     the constants were frozen at module load, so any downstream delete
     had no effect.)
  2. In `src/shell/deeplake-shell.ts`, detect one-shot mode (`-c` in
     argv) up front and `delete process.env[...]` the four trace
     variables before doing anything else. Interactive REPL mode keeps
     the env untouched so developers still get `[deeplake-sql]` lines
     when they set the vars intentionally.

Test coverage in `claude-code/tests/shell-bundle-sql-trace-silence.test.ts`:
  - Spawns the built `claude-code/bundle/shell/deeplake-shell.js` with
    fake creds and HIVEMIND_TRACE_SQL / DEEPLAKE_TRACE_SQL /
    HIVEMIND_DEBUG / DEEPLAKE_DEBUG all set to "1", pointed at an
    unreachable API URL with a 200ms query timeout. After the SQL query
    fails (expected), asserts stderr is free of `[deeplake-sql]` lines.
  - A source-level check confirms `traceSql` reads the env vars inside
    the function body (runtime) rather than via a frozen top-level
    `const TRACE_SQL`.

Regression verified: stashing both source changes causes the bundle
test to fail with the expected `[deeplake-sql] query fail:` line in
stderr and the source-level test to report the reintroduced top-level
const; restoring the source brings both green.

End-to-end verified against `locomo_benchmark/baseline` on a 6-QA
subset (conv 0 QAs 3 / 11 / 27 / 32 / 59 / 65). Before fix: 2–4 SQL
trace lines leaked into each QA's tool_result stream. After fix: zero
leaks across all six transcripts. qa_3 and qa_11 (already correct with
fix #1 + fix #2) stay correct; the hard QAs (27, 32, 59, 65) continue
to show judge-score variance under Haiku non-determinism but are no
longer looking at SQL noise as their "retrieval result".
`sqlLike(value)` escapes `_` and `%` in the value by prefixing them with
backslashes so callers can interpolate user-controlled strings inside
`LIKE 'pattern'` literals. But the Deeplake SQL backend does not treat
backslash as the LIKE escape character by default — without an explicit
`ESCAPE '\'` clause, `\_` becomes two literal characters in the pattern
instead of a literal `_`, so queries whose paths contain underscores
silently return nothing.

Empirically reproduced on the `locomo_benchmark/baseline` workspace:

    grep -l Caroline /home/.deeplake/memory/sessions/*.json
      → returns 20+ session paths (works: path has no underscores past
        the final slash, sqlLike produces '/sessions/%.json')

    grep -i hike /home/.deeplake/memory/sessions/conv_0_session_*.json
      → returns (no matches) before this fix — because the SQL becomes
        path LIKE '/sessions/conv\_0\_session\_%.json' and Deeplake
        matches `\_` literally against `_` → zero rows
      → returns real matches after this fix (ESCAPE '\' added, `\_` is
        now interpreted as literal `_`, matches the underscored paths)

Same symptom in the 100-QA post-fix baseline_cloud run: 15 / 100 QA
that local baseline answered correctly came back wrong/partial in the
cloud, and the tool-call transcripts show repeated `(no matches)` on
grep commands whose glob mentions `conv_<c>_session_*.json`.

The fix appends ` ESCAPE '\'` to every `LIKE '...'` clause that is
fed from `sqlLike()`:

  - src/shell/grep-core.ts:buildPathCondition — both the wildcard path
    branch and the directory-prefix branch.
  - src/hooks/virtual-table-query.ts:buildDirFilter — per-dir
    `path LIKE '<dir>/%'` clauses used by listVirtualPathRowsForDirs.
  - src/hooks/virtual-table-query.ts:findVirtualPaths — both the
    memoryTable and sessionsTable branches, on both the path and the
    filename LIKE clauses.

Codex/Claude Code find fallbacks and `bash-command-compiler`'s
`find_grep` path ultimately call `findVirtualPaths`, so they inherit
the fix without a local change.

Rebuild updates the 8 Claude Code and 8 Codex bundles.

Verified via a targeted reproducer that drives `processPreToolUse`
with the same glob commands against the real baseline workspace: all
three underscored-glob greps return real matches after the fix, where
previously they returned `(no matches)`.
…review truncation

Claude Code's Bash tool silently persists any tool_result larger than
~16 KB to disk and replaces it with a 2 KB preview plus a path to the
persisted file. The model almost never recovers from that replacement:
in the locomo `baseline_cloud_100qa_fix123` run (100 QA, all fixes #1 /
#2 / #3 applied), 11 / 14 losing QAs that hit the persist path never
read the persisted file even once, and finished on the truncated 2 KB
preview — which was rarely enough to carry the answer.

Typical triggers from that run:

  - `grep -r Caroline /home/.deeplake/memory/` → 66 KB of dialogue lines
    because the name appears in nearly every session.
  - `for f in /.../sessions/conv_0_session_*.json; do grep ...; done`
    → 926 KB of concatenated grep output (slow-path shell bundle).
  - `cat /.../sessions/conv_0_session_*.json` (glob over many files)
    → tens of KB of JSON.

This fix introduces `src/utils/output-cap.ts` with
`capOutputForClaude(output, {kind})` and applies it on the plugin's
exit paths before Claude Code sees the result:

  - `grep-direct.ts:handleGrepDirect` — caps grep's combined output.
  - `bash-command-compiler.ts:executeCompiledBashCommand` — caps the
    final concatenation of compiled segments (cat / ls / find / grep /
    find_grep, incl. `&&` and `;` pipelines).
  - `pre-tool-use.ts` direct read path — caps `cat` / `head` / `tail`
    Bash intercepts. Read-tool intercepts are unaffected: they write
    content to disk and return a `file_path`, so no size pressure from
    Claude Code's preview truncation applies.
  - `pre-tool-use.ts` direct `ls` and `find` fallbacks — capped too.

Cap is 8 KB (CLAUDE_OUTPUT_CAP_BYTES), comfortably under Claude Code's
~16 KB persist threshold and 4× the 2 KB preview the model used to get.
When the cap fires, the output is truncated at a line boundary and the
tail gets a short footer:

    ... [grep truncated: 313 more lines (58.4 KB) elided — refine with
    '| head -N' or a tighter pattern]

The footer names the operation (grep / cat / ls / find / bash) and
gives the model an actionable next step.

Unit tests in `claude-code/tests/output-cap.test.ts` (8 tests):
  - No-op for inputs that fit the cap, including empty strings.
  - Byte size after cap is ≤ CLAUDE_OUTPUT_CAP_BYTES.
  - Truncation aligns to line boundaries; footer line counts add up to
    the original total.
  - Single oversized line (no newline) is byte-sliced with a footer.
  - Custom `maxBytes` is honoured (no silent 1 KB floor).
  - Default footer kind is "output" when no kind is passed.
  - A realistic 400-line grep fixture that exceeds 16 KB gets capped
    above 4 KB and under the cap — strictly more useful than the 2 KB
    preview.

Bundle rebuild propagates the change to the 8 Claude Code and 8 Codex
bundles.

Verified empirically via `processPreToolUse` against the real
`locomo_benchmark/baseline` workspace:

  grep -r Caroline /home/.deeplake/memory/
    before fix #5: ~66 KB of output, Claude Code truncated to 2 KB.
    after fix #5:  ~7.9 KB (313 lines kept, 313 more elided, footer).

  grep -r 'Caroline|Melanie' /home/.deeplake/memory/
    before: ~70 KB. after: ~7.9 KB with footer reporting 391 lines elided.

  cat /home/.deeplake/memory/sessions/conv_0_session_1.json
    ~2 KB — unchanged, well under the cap.

Expected impact on the 100-QA baseline_cloud benchmark: 11 QAs that
lost points purely because of the 2 KB preview now see up to 8 KB of
the same grep output. Combined with fix #4 (19 QAs with (no matches)
from SQL LIKE under-escaping), the plugin should close the remaining
~7.5 pt gap to the local-files baseline (75.0 %) and likely match or
exceed it.
Append per-file thresholds in vitest.config.ts for the two source
files that materially changed in this PR, holding them at the same
90 / 90 / 90 / 90 bar already applied to the grep-dual-table files
from PR #60:

  - src/utils/output-cap.ts — new file, fix #5. Currently at
    100 / 100 / 100 / 100 under the tests in
    claude-code/tests/output-cap.test.ts.
  - src/hooks/virtual-table-query.ts — rewritten for fix #1
    (dual-table index generation) and fix #4 (ESCAPE '\' on LIKE
    clauses). Currently at 98.9 / 93.2 / 95.8 / 98.9 under
    claude-code/tests/virtual-table-query.test.ts and
    claude-code/tests/pre-tool-use-baseline-cloud.test.ts.

Files left without new thresholds because their changes in this PR
are small and localized:

  - src/hooks/pre-tool-use.ts — added a Read-intercept branch and
    a writeReadCacheFile helper; the broader file is covered by
    hooks-source.test.ts which is pre-failing on this branch
    (unrelated to the fixes in this PR).
  - src/deeplake-api.ts — moved TRACE_SQL from a module-level const
    into the traceSql function body (fix #3).
  - src/shell/deeplake-shell.ts — three env-var deletes in the
    one-shot entry (fix #3).
…sessions

# Conflicts:
#	claude-code/bundle/capture.js
#	claude-code/bundle/session-end.js
#	claude-code/bundle/session-start-setup.js
#	claude-code/bundle/session-start.js
#	codex/bundle/capture.js
#	codex/bundle/session-start-setup.js
#	codex/bundle/session-start.js
#	codex/bundle/stop.js
#	src/hooks/capture.ts
#	src/hooks/codex/capture.ts
#	src/hooks/codex/session-start-setup.ts
#	src/hooks/codex/session-start.ts
#	src/hooks/codex/stop.ts
#	src/hooks/session-end.ts
#	src/hooks/session-start-setup.ts
#	src/hooks/session-start.ts
…ix #4

Fix #4 (`3d15454`) appended `ESCAPE '\'` to every LIKE clause fed by
`sqlLike()` so backslash-escaped `_` / `%` match their literal
characters on the Deeplake backend. The existing buildPathFilter glob
test still asserted the pre-fix SQL. Update the literal string and the
regex so the assertion matches the new SQL shape, and annotate the
case with a comment explaining why the ESCAPE clause is required.
The `pull_request.branches:` filter matches on the base branch of a
PR. With `[main, dev]` the CI workflow (typecheck + jscpd duplication
check + coverage report) silently skipped any PR targeting a long-
lived feature branch like `optimizations`. Only "PR Checks" and
"Claude PR Review" ran on those PRs, so the coverage and dup report
comments never showed up.

Dropping the filter runs CI on every PR; the push side stays limited
to main/dev so we don't double-run on personal branch pushes.
The merge of `origin/main` pulled in the canonical source refactors for
the Codex hooks (session-start / session-start-setup / stop) but the
corresponding tests on Davit's `optimizations` branch were written
against an intermediate refactor state where helpers like
`runCodexSessionStartSetup`, `extractLastAssistantMessage`,
`buildCodexStopEntry`, `runCodexStopHook`, and the matching
`claude-code/tests/hooks-source.test.ts` imports never made it into
the exported surface. CI was failing with 39 `TypeError: X is not a
function` errors.

Two broken test files are deleted (they never existed on `origin/main`
and their coverage is already provided by the canonical suites added
by PR #62, which landed on `main` and came in with this merge):
  - `claude-code/tests/hooks-source.test.ts` (894 LOC, 19 / 30 failing)
  - `codex/tests/codex-source-hooks.test.ts` (1126 LOC, 20 / 28 failing)

The canonical replacements from `main` cover the same ground:
  - `claude-code/tests/capture-hook.test.ts`
  - `claude-code/tests/session-start-hook.test.ts`
  - `claude-code/tests/session-start-setup-hook.test.ts`
  - `claude-code/tests/session-end-hook.test.ts`
  - `claude-code/tests/codex-capture-hook.test.ts`
  - `claude-code/tests/codex-session-start-hook.test.ts`
  - `claude-code/tests/codex-session-start-setup-hook.test.ts`
  - `claude-code/tests/codex-stop-hook.test.ts`
  - `claude-code/tests/codex-wiki-worker.test.ts`

Two test files also merged in with Davit-branch test blocks that
asserted stale session-start prompt wording. Restored to main's
version:
  - `claude-code/tests/session-start.test.ts` — dropped the "steers
    recall tasks toward index-first exact file reads" block; main's
    session-start prompt uses different phrasing.
  - `codex/tests/codex-integration.test.ts` — restored main's
    assertions ("Do NOT jump straight to JSONL" instead of "Do NOT
    jump straight to raw session files").

Verified: `npx vitest run` — 837 / 837 tests pass across 39 files.
Per-file coverage thresholds unaffected (output-cap.ts 100%,
virtual-table-query.ts 98.9% lines, grep-core.ts / grep-direct.ts /
grep-interceptor.ts / session-queue.ts all above their bars).
…ine count

Three issues flagged by the automated review on PR #63:

1. `writeReadCacheFile` (src/hooks/pre-tool-use.ts) had no containment
   guard: `path.join(cacheRoot, session, "read", rel)` resolves `..`
   segments in `rel`, so a DB-controlled `virtualPath` could escape the
   per-session cache dir. Added a check that `absPath` stays under
   `expectedRoot = join(cacheRoot, session, "read")` and throws
   `"writeReadCacheFile: path escapes cache root: <abs>"` otherwise.
   Uses `path.sep` so the boundary check is correct on any platform.

2. The inline `/index.md` fallback in `processPreToolUse` (pre-tool-
   use.ts:334-347) was unreachable after fix #1 landed, and if somehow
   reached would regenerate the old broken single-table index (queries
   only `memory`, uses the header "${n} sessions:", omits `## Sessions`).
   Removed; the dual-table builder in `virtual-table-query.ts` now owns
   index generation exclusively.

3. `src/utils/output-cap.ts` had a dead `cut += lineBytes` accumulator
   (would trigger `noUnusedLocals` under strict TS config) and a
   trailing-newline off-by-one: `output.split("\n")` on `"a\nb\n"`
   returns `["a", "b", ""]`, so `totalLines` over-counted by 1 whenever
   the input ended with a newline — which grep and cat both do. The
   footer reported one extra "elided line" that was the empty
   terminator, not a real content line. Dropped the dead accumulator
   and adjusted totalLines to subtract the trailing empty entry.

Test coverage:

  - `claude-code/tests/pre-tool-use-baseline-cloud.test.ts` — 4 new
    cases on `writeReadCacheFile`: happy path, `../../../etc/passwd`
    traversal refused (and no file lands anywhere under cacheRoot),
    absolute-root escape refused, and a path that normalizes back
    inside the cache (`/sessions/foo/../bar.json`) is still accepted.
    Plus one integration test that pins the removal of the inline
    /index.md fallback: `processPreToolUse` must materialize the
    dual-table builder's content and must NOT issue its own
    `FROM "memory" WHERE path LIKE '/summaries/%'` SELECT.

  - `claude-code/tests/output-cap.test.ts` — 2 new cases on the line
    counting: with a trailing newline the kept-lines + elided-lines
    sum matches the original line count exactly (no off-by-one), and
    without a trailing newline the count is still exact.

Full suite: 844 / 844 tests passing.
…ed row

The jscpd duplication check used to run as a step inside the
"Typecheck and Test" job, so the PR checks table only showed a single
aggregate row for both. Reviewers couldn't tell at a glance whether
duplication passed without opening the combined log.

Move jscpd into its own `duplication` job named "Duplication check".
Small installation cost (extra `npm install`, runs in parallel with
the test job) in exchange for clear attribution on the PR checks
table. Artifact upload and the jscpd config stay the same.
PR #63 bot review flagged several source files as under-covered. Added
a dedicated branch-coverage suite for the pre-tool-use hook and
registered the two now-sufficient files in `vitest.config.ts` so their
thresholds are enforced on every run.

`claude-code/tests/pre-tool-use-branches.test.ts` — 46 test cases:

  - Pure helpers: buildAllowDecision, buildReadDecision, rewritePaths,
    touchesMemory, isSafe (positive + negative paths).
  - getShellCommand: Grep hit + miss, Read on file + directory, Bash
    safe + unsafe + non-memory, Glob hit + miss, unknown tool → null.
  - extractGrepParams: Grep output_mode=count, empty path → "/",
    Bash delegating to parseBashGrep, non-grep Bash → null, unknown
    tool → null.
  - processPreToolUse end-to-end:
      - returns null for non-memory Bash
      - returns `[RETRY REQUIRED]` guidance for unsupported commands
      - falls back to the shell bundle when no config is loaded
      - Glob + Bash `ls` + Bash `ls -la` long format
      - ls with both file-level (-rw-) and directory (drwx) entries;
        also empty-name rows skipped by the `if (!name) continue` guard
      - cat / head / tail / wc -l / cat | head pipeline
      - find / find | wc -l
      - Grep tool delegates to handleGrepDirect; null result falls
        through to the read/ls branch instead of short-circuiting
      - direct query throws → shell bundle fallback
  - Index cache short-circuit: three cases covering the inline
    readVirtualPathContentsWithCache callback that the bash compiler
    passes into executeCompiledBashCommand — cache hit, cache miss
    (writes fresh index), empty cachePaths edge case.

Coverage after this suite (measured on pre-tool-use-branches +
pre-tool-use-baseline-cloud):

  src/hooks/pre-tool-use.ts         lines 98.9  branches 90.0  funcs 93.8  stmts 98.6
  src/hooks/memory-path-utils.ts    lines 100    branches 90.9  funcs 100    stmts 100

Both now registered under `coverage.thresholds` at 90 / 90 / 90 / 90
in `vitest.config.ts`, alongside the five existing PR-tracked files.

Full suite: 890 / 890 passing (was 844 before this commit).
… paths

CI (HOME=/home/runner) reported two failures on the just-added branch
coverage suite:

  AssertionError: expected '/home/emanuele/.deeplake/memory/...' to be
                  '/sessions/a.json'

The `rewritePaths` and `touchesMemory` assertions hardcoded my local
home path. The real MEMORY_PATH in production is
join(homedir(), ".deeplake", "memory"), so hardcoded absolute paths in
tests don't survive anywhere except my workstation — not CI, not
another developer's machine.

Import `homedir` + `join` from node:os / node:path and build MEM_ABS
once at the top of the file. The two affected cases now use template
strings so the values match whatever home the test runner is using.
The other tests in the suite already use ~-prefixed literals, matched
by the TILDE_PATH branch independently of homedir.

Verified: `env -i HOME=/home/runner PATH=$PATH npx vitest run` —
46 / 46 pass.
@claude
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claude Bot commented Apr 21, 2026

Claude finished @efenocchi's task in 2m 37s —— View job


  • Read CLAUDE.md
  • Analyze PR diff
  • Post inline review comments

Summary

Found 4 issues, all posted as inline comments:

  • src/deeplake-api.ts:158 — Timeout errors throw immediately without retrying; transient timeouts become permanent failures.
  • src/deeplake-api.ts:179retryable403 also retries HTTP 401 Unauthorized, which is a permanent auth failure, not a transient error; wastes retry budget.
  • src/hooks/virtual-table-query.ts:193filenamePattern parameter must be pre-escaped with sqlLike() by callers but the signature doesn't signal this; future callers risk SQL injection.
  • src/utils/output-cap.ts:62Buffer.slice() at a byte offset can split multi-byte UTF-8 sequences, producing U+FFFD replacement characters in the truncated output.

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github-actions Bot commented Apr 21, 2026

Coverage Report

Scope: files changed in this PR. Enforced threshold: 90% per metric (per file via vitest.config.ts).

Status Category Percentage Covered / Total
🟢 Lines 95.51% (🎯 90%) 1829 / 1915
🟢 Statements 93.07% (🎯 90%) 2121 / 2279
🟢 Functions 92.33% (🎯 90%) 265 / 287
🔴 Branches 86.54% (🎯 90%) 1601 / 1850
File Coverage — 16 files changed
File Stmts Branches Functions Lines
src/deeplake-api.ts 🟢 96.9% 🔴 88.9% 🟢 97.3% 🟢 98.2%
src/hooks/bash-command-compiler.ts 🟢 94.1% 🔴 87.4% 🟢 96.2% 🟢 99.0%
src/hooks/codex/pre-tool-use.ts 🟢 98.1% 🔴 87.3% 🔴 81.8% 🟢 99.3%
src/hooks/grep-direct.ts 🟢 97.0% 🟢 92.9% 🟢 100.0% 🟢 98.4%
src/hooks/memory-path-utils.ts 🟢 100.0% 🟢 90.9% 🟢 100.0% 🟢 100.0%
src/hooks/pre-tool-use.ts 🟢 98.6% 🟢 90.0% 🟢 93.8% 🟢 98.9%
src/hooks/query-cache.ts 🟢 95.7% 🟢 100.0% 🔴 80.0% 🟢 100.0%
src/hooks/session-queue.ts 🟢 96.7% 🔴 88.3% 🟢 100.0% 🟢 98.3%
src/hooks/version-check.ts 🟢 100.0% 🟢 92.5% 🟢 100.0% 🟢 100.0%
src/hooks/virtual-table-query.ts 🟢 98.1% 🟢 93.2% 🟢 95.8% 🟢 98.9%
src/shell/deeplake-fs.ts 🔴 89.4% 🔴 79.3% 🔴 85.5% 🟢 92.8%
src/shell/deeplake-shell.ts 🔴 0.0% 🔴 0.0% 🔴 0.0% 🔴 0.0%
src/shell/grep-core.ts 🟢 96.2% 🟢 90.3% 🟢 97.0% 🟢 100.0%
src/shell/grep-interceptor.ts 🟢 97.8% 🟢 91.1% 🟢 91.7% 🟢 100.0%
src/utils/direct-run.ts 🔴 66.7% 🔴 50.0% 🟢 100.0% 🔴 80.0%
src/utils/output-cap.ts 🟢 96.7% 🟢 100.0% 🟢 100.0% 🟢 100.0%

Generated for commit 3ca3ddf.

Comment thread src/deeplake-api.ts
// Network-level failure (DNS, TCP reset, timeout, etc.)
if (isTimeoutError(e)) {
lastError = new Error(`Query timeout after ${QUERY_TIMEOUT_MS}ms`);
throw lastError;
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Timeout errors are thrown immediately, bypassing all retries — but timeouts from AbortSignal.timeout() are often transient (brief network congestion, cold-start latency). Skipping retries makes any single 10-second stall a permanent failure for the query.

Fall through to the normal retry path instead of throwing early:

Suggested change
throw lastError;
lastError = new Error(`Query timeout after ${QUERY_TIMEOUT_MS}ms`);

(remove the throw lastError; line so the loop continues to retry)

Comment thread src/deeplake-api.ts
if (attempt < MAX_RETRIES && RETRYABLE_CODES.has(resp.status)) {
const retryable403 =
isSessionInsertQuery(sql) &&
(resp.status === 401 || (resp.status === 403 && (text.length === 0 || isTransientHtml403(text))));
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Retrying on HTTP 401 Unauthorized is incorrect: 401 means the bearer token is invalid or expired, which won't resolve itself on retry — it will just exhaust the retry budget and add ~1.4 s of sleep before the permanent failure. The intent here is transient 403s (Cloudflare/nginx gateway pages), not auth failures.

Suggested change
(resp.status === 401 || (resp.status === 403 && (text.length === 0 || isTransientHtml403(text))));
(resp.status === 403 && (text.length === 0 || isTransientHtml403(text)));

memoryTable: string,
sessionsTable: string,
dir: string,
filenamePattern: string,
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filenamePattern is interpolated directly into SQL and must be pre-escaped by the caller with sqlLike() — all three current callers do this correctly, but the plain string type gives no indication of the contract, making it easy for a future caller to pass a raw pattern and introduce SQL injection.

Rename the parameter to signal the expectation, e.g.:

Suggested change
filenamePattern: string,
sqlLikeFilenamePattern: string,

and update the three call sites from namePattern/filenamePattern to match.

Comment thread src/utils/output-cap.ts Outdated

if (keptLines.length === 0) {
// A single line is already over budget — take a prefix and mark it.
const slice = Buffer.from(output, "utf8").slice(0, budget).toString("utf8");
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Slicing a UTF-8 Buffer at a byte boundary can split a multi-byte sequence; toString("utf8") then inserts U+FFFD replacement characters, corrupting the output suffix. Use Buffer.from(output).subarray(0, budget) (same effect, non-deprecated) or find the nearest valid character boundary.

Suggested change
const slice = Buffer.from(output, "utf8").slice(0, budget).toString("utf8");
const slice = Buffer.from(output).subarray(0, budget).toString("utf8");

…use from 0%

Two changes driven by PR #64 review bot:

1) `output-cap.ts` — fix the UTF-8-boundary issue flagged on the
   single-oversized-line path. Naive `Buffer.slice(0, budget)` can
   split a multi-byte UTF-8 sequence, and the subsequent
   `toString("utf8")` then leaks U+FFFD replacement characters into
   the output suffix. Migrate to `Buffer.subarray` (the non-deprecated
   replacement for `.slice`) and, before decoding, back up to the
   nearest valid UTF-8 start byte — any byte whose top two bits are
   `10xxxxxx` is a continuation byte and must not be a boundary.

   Added two regression cases in `output-cap.test.ts`:
     - single 20 000-char line of `©` (2 bytes each) — byte budget
       falls mid-sequence; must produce zero U+FFFD.
     - multi-line content with multi-byte chars — standard line-
       boundary truncation; still asserts zero replacement chars.

2) `src/hooks/codex/pre-tool-use.ts` — the Codex pre-tool-use hook
   sat at 0% coverage. New
   `codex/tests/codex-pre-tool-use-branches.test.ts` (26 tests)
   exercises `processCodexPreToolUse` across every routing branch,
   using the same mock-at-the-network-boundary style as the Claude
   Code branch coverage suite:
     - pass-through (non-memory), guide (unsafe command), shell
       fallback with/without empty result
     - compiled bash fast-path + the inline
       `readVirtualPathContentsWithCache` callback (cache hit → SQL
       only issued for non-cached path)
     - direct read: cat / head -N / head (default 10) / tail -N /
       tail (default 10) / wc -l / `cat | head` pipeline
     - `/index.md` cache hit, cache miss (fresh fetch + cache
       write), and the inline memory-table fallback when the
       virtual-path read returns null
     - ls branch: short + long format with mixed file/dir entries,
       empty-name rows skipped, empty directory
     - find / find | wc -l / find no matches → `(no matches)`
     - grep delegated to handleGrepDirect
     - direct-query throw → falls back to runVirtualShell

   Also covers the pure helpers `buildUnsupportedGuidance` and
   `runVirtualShell` (error path).

Coverage moves on PR scope (files changed vs origin/main):
  lines       87.81% → 95.61%
  statements  86.29% → 93.15%
  functions   89.20% → 92.33%
  branches    79.44% → 86.38%

`src/hooks/codex/pre-tool-use.ts` specifically goes 0% → 99.3%
lines / 87.3% branches / 81.8% functions / 98.1% statements.
@efenocchi efenocchi merged commit b4cdeae into main Apr 21, 2026
3 checks passed
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