feat(fallback): ovos.skills.fallback.list, so a client can see what has no phrases - #951
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feat(fallback): ovos.skills.fallback.list, so a client can see what has no phrases#951goldyfruit wants to merge 2 commits into
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…as no phrases The intent manifest enumerates registered intents. A fallback skill registers no intent and no phrasings at all -- it registers a handler that is offered every utterance nothing else matched -- so it cannot appear there by construction, and until now nothing else on the bus could be asked about it either. That gap is not academic, and this is how it was found. On a bilingual hub, `ovos.intent.list` answered with 69 registrations, every one of them en-US and none for fr-FR, while the same hub answered "quelle heure est-il" correctly in under two seconds. The French was coming from fallback handlers -- visible on the bus as `ovos.skills.fallback.<skill>.request`, against a direct `<skill>:time.current` match for English -- and invisible to every query a client can make. A client reading that manifest cannot tell "no intents match this language" from "this language is answered by fallbacks", and those are opposite facts about whether the assistant understands you. One such client, a voice satellite, told its user their house did not speak French while the house was answering them in French. So the registry becomes askable. The reply carries the registered skills and their priorities, ordered the way the pipeline will try them, because a caller reading this to explain "what might answer me" is reading a plan and a plan in arbitrary order is a worse plan. Ties break on skill_id so the answer is stable. It carries no phrasings, because a fallback has none to give. That a fallback exists is the whole of what can honestly be published about it, and it is enough: a client that knows three fallbacks are loaded can say "no phrasings are registered for this language, and it may still be answered" instead of implying silence. The handler takes `_fallback_registry_snapshot()` like every other read in this service, because the registry is mutated from the bus handler threads serving register/deregister while queries run, and it is removed on shutdown alongside its siblings.
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ChangesFallback registry query
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to Fallback skills can now be discovered through a stable bus response without affecting existing fallback handling; malformed registrations and shutdown cleanup are handled safely. Sequence Diagram(s)sequenceDiagram
participant FallbackQueryCaller
participant FakeBus
participant FallbackService
participant ResponseListener
FallbackQueryCaller->>FakeBus: emit ovos.skills.fallback.list
FakeBus->>FallbackService: invoke handle_list_fallbacks
FallbackService->>FallbackService: snapshot, filter, and sort registry
FallbackService->>FakeBus: emit ovos.skills.fallback.list.response
FakeBus->>ResponseListener: deliver fallback snapshot
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✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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In `@ovos_core/intent_services/fallback_service.py`:
- Line 94: Update handle_register_fallback to validate and reject a missing
skill_id before mutating registered_fallbacks, while preserving valid
registrations and the existing response behavior.
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ovos_core/intent_services/fallback_service.pytest/unittests/test_fallback_service.py
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handle_register_fallback reads skill_id off the message and stores whatever it finds, so the registry can hold a None key. Sorting that against a str raises TypeError -- and it does so before the reply is emitted, so a malformed registration somewhere else turns this query into one that never answers and the caller waits out its timeout. An entry with no skill_id also names nothing a caller could act on, so it is left out rather than reported. Validating on the register side would be the deeper fix; it changes behaviour this PR does not otherwise touch, so it is left to the maintainers.
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The gap
The intent manifest (
ovos.intent.list/ovos.intent.describe) enumerates registered intents. A fallback skill registers no intent and no phrasings at all — it registers a handler offered every utterance nothing else matched — so it cannot appear there by construction, and nothing else on the bus can be asked about it either.A client that wants to answer "what can I be asked?" can enumerate every registered intent and still be unable to mention a
FallbackSkillthat answers a whole category of questions.Correcting how I found it
I first hit this on a bilingual hub whose manifest reported 69 registrations, all
en-USand none forfr-FR, while the hub answered French correctly through fallback handlers. I originally wrote this PR up as "the manifest cannot describe a language the hub demonstrably serves".That framing was wrong and I want to be straight about it. The cause turned out to be my own misconfiguration —
secondary_langswritten one level too deep in the deployment's config, so the skills' French intent files were never registered. With the config corrected the manifest becomes accurate about French, and that particular symptom disappears.Why it is still worth having
The underlying gap survives the correction, because it is structural rather than configuration-dependent:
FallbackSkillregisters a handler, not intents. On a correctly configured hub it is still invisible to the manifest — there is nothing to register and nothing to publish._fallback_answerat priority 95 as a deliberate design choice, and a general-purpose fallback skill answers open questions. Neither can ever be listed.The change
One bus query, in
FallbackService:_fallback_registry_snapshot()like every other read in this service, since the registry is mutated from the bus handler threads serving register/deregister while queries run.skill_idis not a non-empty string.handle_register_fallbackstores whatever the message carried, so aNonekey sorted against astrraisesTypeErrorbefore the reply is emitted — turning a malformed registration elsewhere into a query that never answers. Validating on the register side would be the deeper fix; it changes behaviour this PR does not otherwise touch, so it is left to maintainers.Tests
8 cases in
test_fallback_service.py: the empty registry (an answer, not silence), priority ordering, stable tie-breaking, snapshot rather than live dict, shutdown symmetry, and the malformed-registry crash above.test_fallback_service.py,test_fallback_registry_concurrency.pyandtest_intent_manifest.py— 108 passed.Follows #938, which made
ovos.intent.describeanswer for a whole skill.