chore(harness): /verify-audio — the audio loopback fixture as a callable skill by tato123 · Pull Request #2017 · tatolab/streamlib

tato123 · 2026-08-28T19:58:41Z

Summary

The audio loopback fixtures shipped with the rung that built them, but nothing routed to them. /verify-audio wraps them the way /verify-live wraps the PSNR rigs, so an audio change gets verified by habit rather than by whoever remembers the incantation.

The skill owns the workflow; the fixture owns the measurement. It picks the mode, brings the virtual device up, reads the verdict and surfaces the artifacts, and re-implements none of the signal generation or analysis — stated in the text, so a future session extending it knows which side wins a disagreement.

Both modes are reachable and the report names which ran. Through-engine (verify_audio_loopback.sh) is the default because it is the question a PR usually has; rig-only (e2e_audio_loopback.sh) answers "is the machine sound" with no StreamLib in the path. A non-zero, non-77 through-engine exit re-runs the rig fixture before reporting anything, and reports the pair — "the rig is broken" and "the rig is fine, the engine broke it" have different owners.

77 is cannot-run, never a pass. Both fixtures gate on virtual_audio_device.sh check and exit 77 where no PipeWire session is reachable. The skill says so, and says not to fall back to a unit test and call the area verified.

Things it encodes that a caller would otherwise learn by failing:

PYTHON must be absolute — the through-engine fixture starts its node from a subshell that cds into the fixtures directory first, so a repo-relative interpreter dies there.
The artifacts directory is the last artifacts: line on stderr — a through-engine run prints two, and the first is the nested channel tap's. And a failing run prints none at all, because both fixtures echo it only after the analyser — which is exactly the run whose node.log you need, so the skill gives ls -dt /tmp/streamlib-audio-loopback-* | head -1 instead.
A busy control-plane port can return a green run that measured somebody else's process. A second StreamLib node on 9077 declaring a MicrophoneSource — an orphaned audio_loopback_node.py is the realistic instance — makes the tap resolve against that graph, and the run exits 0 reporting PASS. Every other collision shape announces itself; this one does not. The skill answers it with a free preflight (ss -ltn | grep ':9077') and a rule to confirm the tapped channel id belongs to your own node. A busy port also stalls the run up to half an hour first, and Connection refused is the opposite condition — nothing listening at all, a real failure never to be dismissed as a collision. See note 2.
A hole and a splice draw the same spectrogram stripe, and an amplitude fault draws nothing at all — a 0.6x signal fails on amplitude while looking perfectly healthy. So the image never travels without the failed list.

The rig-gate inventory entry rides here, as the ticket asked. /verify-live gains an Audio loopback rigs section — both fixtures, the three INJECT_BUG modes and what each does, and the exit-77 skip convention — plus the one decision-tree line that routes an audio change to it.

Closes

Closes #1999

Exit criteria

/verify-audio runs the loopback end to end and reports a verdict, the measured numbers, and the spectrogram, without the caller knowing any tool invocations. The skill carries the commands, the artifact-location rules, the field glossary and a fill-verbatim report template.
A failing through-engine run is automatically distinguished from a broken rig before the result is reported. Exercised, not just written — see the triage row in the test plan.
An environment that cannot run the fixture is reported as such and never as a pass. Exit 77 verified on both fixtures under an unreachable session.

Test plan

The ticket's validation shape: exercised by running it, checking each of pass / fail / cannot-run is distinguishable. All five runs were on this machine against a live PipeWire session.

#	What	Command	Result
1	Healthy, through-engine	`verify_audio_loopback.sh`	exit 0, `verdict PASS`, `failed []`
2	Healthy, rig-only	`e2e_audio_loopback.sh /tmp/…`	exit 0, `verdict PASS`, `failed []`
3	Deliberately corrupted capture	`INJECT_BUG=drop e2e_audio_loopback.sh`	exit 1, `verdict FAIL`, five named failures
4	No audio session, both fixtures	`PIPEWIRE_REMOTE=streamlib-no-such-session …`	exit 77 each, `SKIP: no virtual audio device available on this machine`
5	Triage path	through-engine forced to fail, then rig-only per the skill	through-engine exit 1 → rig-only exit 0 PASS → correctly reported as "rig sound, failure on the StreamLib side"

Run 1 — healthy through-engine. fundamental_hz 440.0, amplitude 0.5, thd_percent 0.001, symbols 482917 of 482917, symbol_interval_error_ms 0.0, cumulative_interval_error_ms 0.0, silent_stretch_ms 0.2, missing_loud_audio_ms -0.0. The nested channel contract also passed: 24 blocks, 48 kHz, 2ch f32, block_continuity_error_ms 0.0, frame_versus_block_timestamp_error_ns 0, bags_dropped_by_the_tap 0.

Run 1. The solid horizontal bar is the 440 Hz reference tone; the six evenly spaced stacks are the DTMF symbols. No vertical discontinuity anywhere — this is what the skill tells a reader a healthy run looks like.

Run 3 — the injected drop. symbol_interval_error_ms -29.0 (worst span tone->4), cumulative_interval_error_ms -29.0, silent_stretch_ms 21.1, missing_loud_audio_ms 26.7, thd_percent 0.53; failed ["silent_stretch_ms", "missing_loud_audio_ms", "signal_ended_early", "symbol_interval_error_ms", "cumulative_interval_error_ms"]. Note the symbols still decode as 482917 — identity survives the loss and only the spacing moves, which is the property the signal was designed around.

Run 3. Same tone bar and six symbol stacks, plus a vertical broadband stripe cutting through the tone — the splice where 30 ms was excised. This is the image that makes the failure legible without reading a single number, which is why the skill requires attaching it.

No unit-test surface was added: per the ticket the skill is glue, and its correctness is whether the three outcomes are distinguishable — which is what the table above measures.

Full local gate battery: 33 passed, 0 failed. For a markdown-only diff the load-bearing one is check-no-in-process-placement — its EXEMPT_PROHIBITION_LINES keys are path-pinned and it scans prose — and it passed with 7405 files scanned and all 19 exempt prohibition lines still matching. Also green: all 11 source-walking xtask gates, cargo fmt --check, licence headers, cargo deny licences, the rig-brake and ship-change-gate script suites (48 + 37), workspace clippy, cargo test --workspace (2364 passed / 0 failed), the wheel's 349 non-GPU pytests, mypy.stubtest and pyright. The hardware-integration tier was not run — nothing in this diff is compiled.

Notes for owner

1. The through-engine fixture has no injection mode, so half the gate has never been deliberately seen red. e2e_audio_loopback.sh carries silence / drop / gain and I proved one of them here; verify_audio_loopback.sh carries none. The only time it has been observed failing is by accident — an earlier revision of the fixture, recorded in #2013's PR body. Injecting there means corrupting what the engine carries rather than what is played, which is fixture work and would have mixed feature work into an operating-model PR (.claude/rules/flow.md). The skill states the gap in the text rather than papering over it. Recommendation: worth a small fixture ticket, but it does not block anything — say the word and I'll file it.

2. host_control_plane(bind_port=N) does not honour N, and the fallback costs half an hour. runtime/streamlib-api-server/processors/api_server.rs:221-256 walks up to ten ports from the one requested and reports the substitution only at INFO (Port 9077 in use, bound to 9078 instead). A caller who pinned a port gets a node serving a different one, and every client that trusted the pin then fails — and fails slowly: verify_audio_loopback.sh's startup poll is 60 attempts at a call bounded by CONTROL_VERB_TIMEOUT_SECONDS = 30.0, so a squatter that accepts and never answers costs up to 30 minutes before the run gives up.

Worse than slow: it can be silently green. Combined with verify_audio_channel.sh resolving a processor by display name against whatever answers at the URL — with no check that it is the node the fixture started — a stale audio_loopback_node.py on 9077 makes the run tap the wrong process and exit 0 with PASS. Reproduced. Two independent softenings would each kill it: an explicit bind_port that fails instead of walking, or the fixture asserting the graph it tapped is its own. The skill covers it with a preflight and an identity check, which is the harness half of the answer; the engine and fixture halves are not mine to land here.

Recommendation: file it. A bind_port that is explicitly passed and silently ignored is a footgun for every fixture and example that pins one, and here it manufactures a false pass.

3. One line beyond the literal inventory entry. The ticket commissioned the inventory entry; I also added a single decision-tree line in /verify-live routing an audio change to it. An inventory nothing routes to is the same discoverability defect the ticket names, and the tree is the path a reader actually takes. Flagging it as a judgement call rather than burying it — trivially revertible if you disagree.

4. Not touched: the examples/audio-mixer-demo. The ticket's rationale names it as the thing that stopped being usable as verification. Consumers lag by design, so nothing here reads or edits it.

5. attach-artifact is referenced by three skills and lives in none of them. The skill exists and works — I used it to upload the spectrograms above — but at the user level (~/.claude/skills/attach-artifact), not in this repo. So a fresh clone has three skills pointing at something it does not have: verify-live:83, capture-node-evidence:43, and now verify-audio. I followed the existing convention rather than diverging from it. Pre-existing, not introduced here, and worth deciding once — vendor it into the repo, or accept it as machine-local.

6. The through-engine fixture never verifies what its streams actually linked to. Its rig-only sibling does — e2e_audio_loopback.sh:83-96 checks pw-link output and keeps capture_link.txt, with a comment explaining why: "a PipeWire --target is a hint: an unresolvable one links to the session default instead of failing". verify_audio_loopback.sh has no equivalent, and node.log echoes only the requested device_id. So on a machine with live speakers and a live microphone, a run whose targets silently resolved to the session default would pass while measuring the room. Surfaced by the third review round. Fixture work, not skill text, and the reviewer's own recommendation was to note it rather than grow this diff. Recommendation: file it alongside note 1 — both are the same fixture wanting the hardening its sibling already has.

Review

review-pr ran three rounds. It returned REJECT twice, and both blockers were real defects in my own text — each one in the part of the skill whose entire job is to stop a misdiagnosis.

Round 1 — the port section was inverted. I had written that a busy 9077 presents as Connection refused. It does not: that string is the signature of the opposite condition, nothing listening at all. My evidence had been contaminated — the squatter I used to force the failure held the port on a 180-second sleep and died mid-run, freeing 9077 while the node sat on 9078, so I measured a refusal from an empty port and blamed the collision. Left in, it would have taught a reader to dismiss a genuinely dead node as a benign port clash. Re-derived by running all three shapes; the ~30-minute stall (60 poll attempts at a 30 s client timeout) came out of the same pass and was undocumented. Also folded: an analyser FAIL does print artifacts: and only a pre-analyser exit skips it; exit 2 belongs to the through-engine fixture alone; and the report.json sentence implied the channel tap's directory was bare.

Round 2 — the enumeration was incomplete in the one direction that matters. Every shape I had listed announces itself. The reviewer found the one that does not: a second StreamLib node on 9077 that declares a MicrophoneSource makes the tap resolve against that node's graph, so the channel contract is measured on a different process and the run exits 0 reporting PASS. I reproduced it before accepting it — squatter on 9077, FIXTURE_EXIT=0, verdict PASS, tapped channel pmaqq7tbubkdhto90godpuoze/audio belonging to the squatter rather than to the fixture's own node. The realistic instance is an orphaned audio_loopback_node.py from a killed run, which defaults to 9077 and declares exactly that processor — i.e. the fixture this skill drives. A skill built to prevent unearned greens was one stale process away from producing one.

It is now the first and loudest bullet, with two mitigations: a free ss -ltn | grep ':9077' preflight, and a rule — carried into the report template — to confirm the tapped channel id belongs to the node whose node.log you have.

Round 2 also caught the recovery command wrong twice over: ls is aliased to eza on this machine, which reads -t as --time=FIELD and returns a stale alphabetical answer with no error; and the rig-only fixture shares the same streamlib-audio-loopback- mktemp prefix, so the triage re-run the skill itself prescribes leaves a decoy directory with a spectrogram and no node.log. Selecting on node.log through /bin/ls fixes both, and the triage step now passes an explicit output directory so it stops making the decoy.

Round 3 returned no blockers — four attribution errors, all one- or two-line edits, each verified before folding. The orphan sits on 9077 because verify_audio_loopback.sh puts it there (the node's own default is 9000), so a reader reproducing the collision by hand would have used the wrong port. The identity check needed its command and its flag: the tap lowercases the processor id and node.log does not, so the exact-case grep a reader reaches for returns zero hits on a healthy run — a false alarm every time. The artifacts rule was still too coarse: a channel contract failing its analysis does print one artifacts: line, the nested tap's, so "take the last one" lands in a directory with no node.log; on any non-zero exit, recover the directory instead. And the decoy is made by any default-directory rig-only run, not by the triage step, which now passes an explicit directory precisely so it doesn't.

Round 3 also confirmed the round-2 blocker closed: it traced every non-port route to exit 0 in the fixture and found none, and reported no silently-green outcome missing from the port enumeration. Its one remaining item is a fixture gap, not a skill misstatement — note 6.

Across the three rounds the reviewer independently saw the gate red four ways (silence, drop, gain, plus a clean control), proved the cannot-run path with the tools off PATH, read every spectrogram by eye, and cleared scope, placement and doctrine — including judging the extra decision-tree line in note 3 to be in scope rather than creep.

🤖 Generated with Claude Code

Summary by CodeRabbit

Documentation
- Added guidance for verifying audio capture and playback using known test signals.
- Documented preflight checks, setup requirements, result interpretation, and troubleshooting steps for audio verification.
- Clarified how to handle unavailable virtual audio devices and distinguish skipped checks from successful verification.
- Added a decision path directing audio-related checks to the appropriate verification workflow.

The loopback fixtures are only useful if reaching for them is cheaper than remembering they exist. This wraps them the way /verify-live wraps the PSNR rigs: the skill owns the workflow, the fixture owns the measurement, and a disagreement between them resolves toward the fixture. Three things it knows that a caller would otherwise learn by failing. PYTHON must be absolute, because the through-engine fixture starts its node from a subshell that cd's into the fixtures directory first. The artifacts directory is the *last* `artifacts:` line on stderr — a through-engine run prints two, and the first is the nested channel tap's. And exit 77 is cannot-run, which is reported as such and never as a pass. A failing through-engine run re-runs the rig-only fixture before reporting, because "the rig is broken" and "the rig is fine, the engine broke it" have different owners and the user should not have to work out which they got. The rig-gate inventory in /verify-live gains the audio entry it was missing — both fixtures, the three injection modes, and the skip convention — plus the decision-tree line that routes an audio change to it.

Exercising the triage path found the skill's own claim wrong. A second node on 9077 does not stop the fixture coming up: the API server walks up to ten ports and reports the one it took at INFO, so the graph runs perfectly while the fixture keeps asking 9077 and reports a connection refused. Left as written it would have sent a reader hunting an engine regression that is not there, which is the confusion this skill exists to prevent.

The review caught the section inverted, and it was: my evidence came from a run whose squatter died mid-flight, freeing 9077 while the node sat on 9078, so I read a "nothing is listening" refusal as the signature of a busy port. Measured all three shapes instead. A socket that accepts and never answers gives `(timed out)`; a foreign HTTP server answers with a status; a second StreamLib node answers for the wrong graph and the run dies naming a missing MicrophoneSource. `Connection refused` is the opposite condition — nothing listening at all, a real failure the old text taught a reader to dismiss. The run also stalls up to half an hour first, at 60 attempts times a 30 s client timeout, which nothing said. Also: both fixtures echo `artifacts:` only after the analyser, so a failing run names no directory — and that is the run whose node.log the reader needs. Find it by age. Exit 2 is the through-engine fixture's alone; the rig-only one has no argument parser. And a hole and a splice draw the same stripe, so the spectrogram never travels without the failed list.

Round two found the enumeration incomplete in the direction that matters. A second StreamLib node on 9077 that declares a MicrophoneSource does not fail the run at all: the tap resolves against that node's graph, so the channel contract is measured on another process and the run reports PASS. Every other shape announces itself, so listing only those taught a reader that a collision is always visible. The realistic instance is an orphaned audio_loopback_node.py from a killed run, which defaults to 9077 and declares exactly that processor. The fix is a free preflight — check 9077 before starting — plus confirming the tapped channel id belongs to the node whose log you have, now a template field. Three more, all measured. The artifacts headline contradicted its own next sentence: an analyser FAIL prints `artifacts:` exactly as a pass does, and only a pre-analyser exit skips it. The recovery command was wrong twice over — `ls` is aliased to eza here, which reads -t as --time=FIELD and returns a stale alphabetical answer with no error, and the rig-only fixture shares the same mktemp prefix, so the triage re-run leaves a decoy with a spectrogram and no node.log. Selecting on node.log through /bin/ls fixes both, and the triage step now passes an explicit output directory so it stops making the decoy. Also: an amplitude fault draws no spectrogram signature at all, verified against a 0.6x signal that fails on `amplitude` and looks perfectly healthy.

None of these changes what the skill tells you to do; each is a claim about why, and a wrong why sends the next reader to the wrong file. The orphan sits on 9077 because verify_audio_loopback.sh puts it there — the node's own default is 9000, so a reader launching it by hand to reproduce the collision would have landed on the wrong port and seen nothing. The identity check needed its command and a reason for the flag: the tap lowercases the processor id and node.log does not, so the exact-case spelling a reader reaches for returns zero hits on a healthy run and reports a collision that is not there. The artifacts rule was still too coarse. A channel contract that fails its analysis does print one `artifacts:` line — the nested tap's — so "take the last one" lands in a directory with no node.log at all. On any non-zero exit, recover the directory instead; only that is safe across every failure path. And the decoy is made by any rig-only run left to its default, not by the triage step, which now passes an explicit directory precisely so it doesn't.

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.claude/skills/verify-audio/SKILL.md

📝 Walkthrough

Walkthrough

This change adds a dedicated audio verification workflow for rig-only and through-engine loopback fixtures. It defines preflight, execution, result interpretation, triage, fault injection, reporting, and routing from live verification.

Changes

Audio verification workflow

Layer / File(s)	Summary
Fixture contract and preflight `.claude/skills/verify-audio/SKILL.md`	Defines the rig-only and through-engine fixtures. The through-engine fixture is the default. PipeWire unavailability returns exit 77 as cannot-run.
Execution, results, and triage `.claude/skills/verify-audio/SKILL.md`	Documents execution requirements, port-9077 hazards, result fields, artifact discovery, spectrogram checks, failure triage, injected faults, and the report template.
Live verification routing `.claude/skills/verify-live/SKILL.md`	Routes audio scenarios to `/verify-audio` and documents fixture modes, signal checks, skip behavior, and StreamLib channel-contract checks.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🟡 Moderate · up to c382f

The new audio verification workflow can misclassify invalid or interrupted runs, report stale artifacts from an earlier attempt, and force cannot-run or partial results into a PASS/FAIL template. These bounded correctness issues can lead to misleading verification reports, so merge should wait for the workflow and report format to handle these states explicitly.

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Title check	✅ Passed	The title clearly identifies the main change: adding the /verify-audio audio loopback fixture as a callable skill.
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Inline comments:
In @.claude/skills/verify-audio/SKILL.md:
- Around line 238-260: Update the report template to support triage runs with
separate per-fixture result sections, each containing its own command, exit
status, measurements, and spectrogram path. Include exit statuses 2 and 130,
allow exit 77 to report verdict n/a, and permit explicit n/a values for
measurements and spectrograms when execution fails before analysis; preserve the
existing cannot-run semantics described near lines 45–47.
- Around line 199-202: Update the verify-audio triage command to use a fresh,
unique output directory for each run, preferably by creating it with mktemp -d
before invoking e2e_audio_loopback.sh; do not reuse the fixed
/tmp/verify-audio-triage path or allow stale report.json, captured.wav, or
spectrogram.png files.
- Around line 195-196: Restrict the automatic rig-only fixture triage in the
verify_audio_loopback.sh handling instructions to exit status 1 only; do not run
it for exit 2 invalid arguments or exit 130 interruption, while preserving the
existing paired-report behavior for the eligible failure.

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…xit 1 CodeRabbit found a reused output directory doing exactly what the rest of this skill exists to prevent. The rig fixture only `mkdir -p`s what you hand it and never clears it, so a triage run that skips at the device check leaves the previous run's report.json and spectrogram in place — measured: a 77 exit against a reused directory left `{"verdict":"PASS"}` sitting there for the report to pick up. Both invocations now take a fresh mktemp directory, still named outside the loopback glob so neither can become the decoy. Triage is also scoped to exit 1. Non-zero-and-not-77 swept in a bad argument and a cancelled run, neither of which says anything about the rig or the engine; both now earn no triage and no report. The template gains the states it was missing: a verdict of n/a when no analysis ran, n/a measurements and spectrogram for a failure before the analyser, and the rig-only re-run's own exit status and artifacts directory so a triage report carries both fixtures' results rather than one.

…edia I/O and archive (#2020) Every ticket of the change is merged: #1988 (the AudioBlock bag, PR #1995), #1989 (the device seam and the null backend, PR #1997), #1998 (the loopback fixture, PR #2001), #2002 (per-processor tap verification, PR #2003), #2004 (the unconnected-output log storm, PR #2005), #1990 (the PipeWire arm, PR #2008), #1991 (the ALSA arm, PR #2010), #1992 (SpeakerSink, PR #2013), #1993 (the removals, PR #2016), #1999 (/verify-audio, PR #2017) and #2012 (stream death reaches its owner, PR #2018) — the last landing 2026-08-28, the archive date. The REMOVED gate is clean at the archived path: 7 bullets, none referenced and none on disk. Eleven DECIDED entries fold into §Media I/O. Six are new — the device seam as one engine primitive, runtime symbol binding, the SPA shim that calls nothing, vendored headers, the unweakened portability gate, and the four AudioBlock entries (wire contract, msgpack bin, the Python cast, the zero-copy claim stated as a claim about the cast, and the harness bin-decode fix). Five existing [audio-subsystem] entries are sharpened in place and gain their SHIPPED citations: the backend chain gains "chosen by opening, not by loading" and the named-device raise; the pacing entry gains the clock starting only when something needs it; A/V sync, the data model and the two built-ins gain theirs. The built-ins entry cites partially — conditioning and immediate cancel are a later rung, and the citation says so. The section stays IN-FLIGHT rather than flipping to SHIPPED: its audio-plugins OPEN entry is still live, and a section ships only when it holds no OPEN. Only the (→ dlopen-audio-backend-and-audio-blocks) pointer goes. #2012 was a follow-up filed during implementation, not part of the approved delta, so it folds into the device-seam entry rather than becoming a plan entry of its own. Every verify marker was run before it was written, on this rig with the wheel rebuilt first: 20 engine and media-builtins tests pass, the PipeWire and ALSA arms pass their hardware tier against a live daemon and /dev/snd (13 tests that otherwise skip), and 29 wheel tests pass. readelf -d on the rebuilt _engine.abi3.so names exactly the five permitted host libraries — the design's own pass/fail, proven rather than asserted. The diagram gains the vendored-shim and DT_NEEDED clause on the media node, and the previously unlabelled media → engine edge now carries the seam and the device-stamping rule. Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

tato123 added 6 commits August 28, 2026 11:50

chore(harness): align the triage template with the triage rule

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tato123 merged commit 3295782 into main Aug 28, 2026
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tato123 deleted the chore/1999-verify-audio-skill branch August 28, 2026 20:28

tato123 mentioned this pull request Aug 28, 2026

docs(plan): ship dlopen-audio-backend-and-audio-blocks — fold into §Media I/O and archive #2020

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