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test(agent): re-anchor the fan-out tests on the async spawn surface (red main since #5757) - #5776
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M3gA-Mind merged 2 commits intoAug 25, 2026
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`main` has been red since tinyhumansai#5757 (`02d81f6cf`), which retired six sub-agent tools from the orchestrator — `spawn_parallel_agents`, `wait`, `wait_loop`, `wait_subagent`, `steer_subagent`, `close_subagent` — cutting the surface from 11 tools to 3. That was deliberate and is pinned both ways in `agents/loader.rs`: three tools required, the six asserted absent. Two test sites were still written against the retired fan-out tool. Neither is deleted. The property they protect still holds; only the mechanism moved, from one dedicated fan-out call to several ordinary async spawns issued together. `parallel_subagent_fanout` now scripts one assistant message carrying two `spawn_async_subagent` calls — the "issued together" shape, which the single-call helper could not express — and asserts both workers were actually dispatched. It asserts on the captured upstream requests rather than on the synthesis text: the children are detached and race the orchestrator's own reply for the global scripted FIFO, so anything keyed on script order is a coin flip. What each worker was asked is deterministic; when it asked is not. The other half of the old assertion — both results reaching the user — is not asserted here and the test says why. Results now return through `background_delivery`, which is idle-gated and debounced onto a later system turn, and it is registered from `bootstrap_core_runtime`, which `boot_stack` does not call. No delivery turn can fire in this harness. `orchestrator_parallel_fanout_routing` anchored on the retired tool name, so it asserted against a prompt that no longer mentions it. It now pins the current guidance — the concurrent primitive, that fan-out is several spawns, and that they run concurrently — which is the same anti-pattern guard tinyhumansai#4754 added, against the tool that exists. A second test pins the other half of the contract: the prompt must not teach a tool `agent.toml` retired, because a prompt teaching an uncallable tool costs a turn to discover.
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📝 WalkthroughWalkthroughThe tests now validate ChangesAsync fan-out orchestration
Estimated code review effort: 3 (Moderate) | ~20 minutes Sequence Diagram(s)sequenceDiagram
participant FanoutTest
participant ScriptedUpstream
participant WorkerRequests
FanoutTest->>ScriptedUpstream: Arm overlap barrier
FanoutTest->>ScriptedUpstream: Script two spawn_async_subagent calls
WorkerRequests->>ScriptedUpstream: Send identified worker requests
ScriptedUpstream->>WorkerRequests: Hold requests until peer arrives
ScriptedUpstream-->>FanoutTest: Record worker overlap
FanoutTest->>FanoutTest: Assert concurrent participation
Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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In `@tests/agent_harness_e2e.rs`:
- Around line 2016-2034: Update the canary mock handling around both_dispatched
so each PARALLEL_ALPHA_CANARY and PARALLEL_BETA_CANARY response is withheld
until both requests have been captured. Preserve the existing polling and
timeout diagnostics, but make the mock release the held responses only after the
shared two-request barrier is reached, so serial dispatch times out while
overlapping workers proceed.
In `@tests/orchestrator_parallel_fanout_routing.rs`:
- Around line 64-83: Update the routing assertion around the spawn_subagent
guidance to require spawn_async_subagent for fan-out instead of the retired
spawn_parallel_agents name, while preserving the existing validation scope and
removing the stale retired-tool expectation.
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tests/agent_harness_e2e.rstests/orchestrator_parallel_fanout_routing.rs
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Addresses four review threads. All four were right; the first two were right about the same underlying mistake. Codex was correct that the alpha/beta assertion was vacuous. Every captured request carries its full conversation history, so after the spawn turn the orchestrator's OWN follow-up contains both `Find PARALLEL_*` strings inside the prior assistant message's `tool_calls`. Searching the serialized body therefore matched the echo, and one worker could be dropped with the test still green. Measured rather than assumed: a run with one spawn and one child shows the alpha prompt twice — once as the worker's request, once as the echo. `canary_worker_request` now identifies a worker's own request by shape: last message, `role == "user"`, content carrying the canary. The orchestrator's follow-up ends with a `tool` result, so it cannot match. Codex and CodeRabbit were both correct that "each worker eventually issued a request" is satisfied by strictly serial execution, which is the opposite of the property this test exists to pin. The mock now holds each armed worker's response until a second armed worker has arrived; overlap is recorded only when two are parked at once. Serial execution parks on the first, expires, and leaves the flag clear. The old doc comment claimed concurrency the assertions did not establish; now they do. CodeRabbit was correct that `spawn_subagent_description_redirects_fanout_to_parallel` still required guidance for the retired tool. It is deleted rather than re-anchored, and the reasoning is left in its place: `spawn_subagent` survives in exactly one agent, `trigger_reactor`, whose whole spawn surface is `spawn_subagent` alone — no `spawn_parallel_agents` and no `spawn_async_subagent`. Pointing the redirect at the new tool would leave it dangling for its only caller. The defect is in the description itself and belongs to tinyhumansai#5757's author, so it is reported, not guessed at. Every new assertion proven load-bearing, on the new assertions rather than the old ones: dropping the beta spawn fails on the structural check; making overlap unreachable fails on the overlap check; removing `spawn_async_subagent` from agent.toml fails on the structural check. Refs tinyhumansai#5757, 02d81f6, tinyhumansai#4754.
This was referenced Aug 25, 2026
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`Rust Core Coverage` is red on main:
composio_raw_coverage_e2e::composio_controller_registry_and_scope_handlers_cover_validation_edges
assertion failed: memory_missing.contains("memory client not initialised")
The string does not exist anywhere in `src/`. `1bf2037a0` ("Stop booting the
second in-process memory engine", #5725, merged 15:39) removed the
in-process engine handle that produced it and moved the storage half onto
the bound driver. The assertion was never re-anchored, so it has been
asserting a message the product no longer emits ever since — an orphaned
test in the sense of #5757 / #5776.
It survived its own PR because the coverage lane is changed-modules-scoped
and that PR did not touch a module which routes to `tests/raw_coverage`.
`ops::user_scopes::save` refuses on three deliberately distinguishable
grounds: "memory driver unavailable" (nothing bound), "does not serve Graph"
(bound, wrong family), and "kv_put failed" (bound, right family, the write
itself failed). Measured rather than assumed — the first re-anchor here
guessed the Graph arm and was wrong. What this path actually reaches is:
[composio][scopes] kv_put failed: the module host policy was never
published, so module 'tinymemory' cannot be loaded; ...
The module provider binds and does serve Graph; the cdylib is simply never
loaded in a test binary that runs no boot sequence.
Pinned: the `[composio][scopes]` tag and the `kv_put failed` arm, which is
what makes this a fail-closed assertion — the handler must refuse rather
than report a save it did not perform, and it must refuse on the write
rather than on one of the other two grounds. Deliberately NOT pinned: the
reason after the colon, which belongs to the module loader rather than to
this handler. Pinning another component's wording here is how the previous
assertion came to be orphaned in the first place.
Swept the rest of the suite rather than assuming this was the only one: of
399 distinct long `.contains("…")` assertions under tests/raw_coverage, 202
name strings absent from `src/`, but all 202 are fixture data — none was
present in `src/` at 2026-08-20 and removed since. Against unfixed main the
same sweep returns exactly one true orphan, this one, which is how I know
the method sees what it is meant to see.
Verified: the target passes with the fix and fails without it, naming this
assertion ("must fail CLOSED on the backing write ...").
This was referenced Aug 27, 2026
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to nocstah/openhuman
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Sep 11, 2026
…estrator-tool-tests\n\ntest(agent): re-anchor the fan-out tests on the async spawn surface (red main since tinyhumansai#5757)\n
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…`Rust Core Coverage` is red on main:\n\n composio_raw_coverage_e2e::composio_controller_registry_and_scope_handlers_cover_validation_edges\n assertion failed: memory_missing.contains("memory client not initialised")\n\nThe string does not exist anywhere in `src/`. `bafc23214` ("Stop booting the\nsecond in-process memory engine", tinyhumansai#5725, merged 15:39) removed the\nin-process engine handle that produced it and moved the storage half onto\nthe bound driver. The assertion was never re-anchored, so it has been\nasserting a message the product no longer emits ever since — an orphaned\ntest in the sense of tinyhumansai#5757 / tinyhumansai#5776.\n\nIt survived its own PR because the coverage lane is changed-modules-scoped\nand that PR did not touch a module which routes to `tests/raw_coverage`.\n\n`ops::user_scopes::save` refuses on three deliberately distinguishable\ngrounds: "memory driver unavailable" (nothing bound), "does not serve Graph"\n(bound, wrong family), and "kv_put failed" (bound, right family, the write\nitself failed). Measured rather than assumed — the first re-anchor here\nguessed the Graph arm and was wrong. What this path actually reaches is:\n\n [composio][scopes] kv_put failed: the module host policy was never\n published, so module 'tinymemory' cannot be loaded; ...\n\nThe module provider binds and does serve Graph; the cdylib is simply never\nloaded in a test binary that runs no boot sequence.\n\nPinned: the `[composio][scopes]` tag and the `kv_put failed` arm, which is\nwhat makes this a fail-closed assertion — the handler must refuse rather\nthan report a save it did not perform, and it must refuse on the write\nrather than on one of the other two grounds. Deliberately NOT pinned: the\nreason after the colon, which belongs to the module loader rather than to\nthis handler. Pinning another component's wording here is how the previous\nassertion came to be orphaned in the first place.\n\nSwept the rest of the suite rather than assuming this was the only one: of\n399 distinct long `.contains("…")` assertions under tests/raw_coverage, 202\nname strings absent from `src/`, but all 202 are fixture data — none was\npresent in `src/` at 2026-08-20 and removed since. Against unfixed main the\nsame sweep returns exactly one true orphan, this one, which is how I know\nthe method sees what it is meant to see.\n\nVerified: the target passes with the fix and fails without it, naming this\nassertion ("must fail CLOSED on the backing write ...").\n
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mainhas been red since #5757 (02d81f6cf, "feat(agent): add orchestrator agent configuration").Rust Core Coveragefails on every commit from1111bdfeonward with:What actually broke, and what did not
#5757 retired six sub-agent tools from the orchestrator —
spawn_parallel_agents,wait,wait_loop,wait_subagent,steer_subagent,close_subagent— cutting the surface from 11 tools to 3. That is deliberate and correct. It is pinned both ways insrc/openhuman/agent/registry/agents/loader.rs:809-821: three tools asserted required, the six asserted absent, with the note "Re-adding one means re-teaching it in prompt.md; don't do it without that." Restoring the tool would now fail that assertion.What broke is two test sites still written against the retired tool. Neither is deleted — the property they protect still holds, only the mechanism moved.
The failure mechanism, confirmed causally rather than inferred: the test scripts request[0] as a
spawn_parallel_agentscall. With the tool out of scope the call is rejected, both children never run, and the orchestrator's next model call consumes script entry [1] —PARALLEL_ALPHA_CANARY— which becomes the final response. Restoring the single line locally turned the test green; that experiment was reverted and is not in this diff.1111bdfeis not where it broke — it is where the test first ranWorth recording, because the bisect window was misleading.
scripts/ci/rust-coverage-changed.shis changed-modules-scoped. A gitlink-only change hits the*)arm →run_full, the whole suite; #5757'ssrc/openhuman/agent/**changes map to a scoped selection that did not include--test agent_harness_e2e. So the tinyagents bump in #5768 merely forced the first full run. I verified this directly: the test fails ate4dd1e143(the commit CI called green) and passes at its parentac4e671eb, and movingvendor/tinyagentsacross all 8 commits of the bump changes nothing in either direction.The changes
tests/agent_harness_e2e.rs—parallel_subagent_fanoutrewrittenScripts one assistant message carrying two
spawn_async_subagentcalls — the "issued together" shapeprompt.md:56teaches ("N independent subtasks means N spawns, issued together. They run concurrently"). The existingtool_call_completionhelper emits a single call and cannot express that; scripting two separate completions would test the serial shape the guidance exists to prevent, so this addstool_calls_completion.Assertions moved from the synthesis text to the captured upstream requests. The children are detached and race the orchestrator's own reply for the global scripted FIFO, so any assertion keyed on script order is a coin flip. What each worker was asked is deterministic; when it asked is not. The test polls for both dispatches rather than sleeping.
The other half of the old assertion is deliberately not made here, and the test says so in its own doc comment. "Both results reach the user" now happens through
orchestration::background_delivery, documented "idle-gated — never mid-turn" and debounced onto a later system turn. That subsystem is registered frombootstrap_core_runtime, whichboot_stackdoes not call (see the note atensure_approval_gate) — so no delivery turn can fire in this harness at all. Asserting it would need new harness plumbing rather than a test rewrite. I would rather leave that gap named in the source than let it look like coverage was quietly dropped; see Not covered below.tests/orchestrator_parallel_fanout_routing.rs— re-anchoredThis suite exists to catch a prompt that lets fan-out serialize (#4754 measured 145-200s gaps between workers). That anti-pattern is unchanged; the guidance it anchored on moved with the tool. It asserted three strings in
prompt.md—spawn_parallel_agents,council,"never a loop of"— all now absent (grep count 0 each), which is why it was asserting against a prompt that no longer mentions them.It now pins the current guidance: the concurrent primitive is named, fan-out is stated to be several spawns, and they are stated to run concurrently. A second test pins the other half of the contract — the prompt must not teach a tool
agent.tomlretired — because a prompt teaching an uncallable tool is worse than one teaching nothing: the model spends a turn discovering it.loader.rspins the tool list; this pins the half that lives in prose.Proof
Everything below was run locally with
--features "$(bash scripts/ci/product-features.sh)" -- --test-threads=1, mirroring the coverage lane's invocation.--test agent_harness_e2e(16)--test orchestrator_parallel_fanout_routing--lib agent::registry::agents::loader+tools::ops_tests(53)The rewritten test is not vacuous. Commenting
"spawn_async_subagent"out of the orchestrator'snamedlist makes it fail (exit=101,FAILED); the tool list was restored before committing andgit diff -- src/is empty. The whole ofsrc/is untouched by this PR — it is tests only.Also verified unaffected, and left alone:
tools_agent_credentials_state_raw_coverage_e2eandtools/ops_tests.rsassertspawn_parallel_agentsis in the global registry, which is still true — only the orchestrator's allowlist dropped it.json_rpc_e2edoes not touch the six.Not covered by this PR
tests/(background_completionsispub(crate), and delivery is not registered in this harness). The right home isorchestration::tools::tools_e2e_tests, which already asserts it for one worker at:166-174; extending that to two is a small follow-up I have not made here to keep this PR to the red-main fix.cargo llvm-cov), only the same targets under plaincargo test.Two things for the author of #5757, not encoded in any test here
prompt.md:61documents a parameter that does not exist. The result-gating hard rule says to use "spawn_async_subagentwithblocking: true, which holds the turn open until the child returns".spawn_async_subagent's schema acceptsagent_id, prompt, context, fresh, model, task_key, task_title, toolkit— there is noblocking. The companion hint atspawn_async_subagent.rs:246namesspawn_subagentwithblocking: true, andspawn_subagentleft the orchestrator in Audit orchestrator harness efficiency and reduce unnecessary delegation/token waste #1141 (loader.rs:823). The other escape hatch in that sentence, a blockingdelegate_*specialist, is genuinely reachable — so one of the two is real and one is fiction. This looked like the kind of thing to raise rather than to write a test around.loader.rs:821cites#5701for the retirement; openhuman#5701 is "mcp registry connections facade", unrelated. Cosmetic, but it is the breadcrumb someone will follow.Refs #5757,
02d81f6cf, #4754.Summary by CodeRabbit