FALLBACK-1: fallback pipeline plugin specification#39
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Merge-readiness: resolved. Merges resolved across two commits (c158adf + db0bace):
Added FALLBACK-1, COMMON-QUERY-1, BRIDGE-1 in-review rows to README spec table. No other semantic flags. Cross-references in Note on #55: |
…isten field Consolidates the PIPELINE-1 companion edits previously bundled into the union-slots (#56), FALLBACK-1 (#39), COMMON-QUERY-1 (#40) and AUDIO-1 (#38) feature PRs into a single one-file change to ovos-pipeline-1.md. - §6.1/§6.2 — orchestrator backstop for required_slots (INTENT-3 §5.3): the orchestrator treats a Match as declined if any required slot is absent. Second line of defense behind engine-side enforcement. - §7.3 — reserve intent_names "fallback" (FALLBACK-1 §6.3) and "common_query" (COMMON-QUERY-1 §3). COMMON-QUERY-1 asserted the reservation but never registered the row; this closes that gap. - §9.6 — add the OPTIONAL listen field to ovos.utterance.speak; the output-side behaviour is owned by AUDIO-1. All additions are backwards-compatible. PIPELINE-1 is already V2 (its namespaced topics replace the pre-spec names); these refinements do not change the class, so the Version stays 2. Adds the missing PIPELINE-1 CHANGELOG section. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Companion issue: #48
Summary
Defines the fallback pipeline plugin — the final stage(s) in the utterance lifecycle that handle utterances no earlier stage claimed, by querying registered fallback skills in priority order and dispatching to the first willing one.
The defining property of a fallback skill is that it evaluates the utterance with its own logic rather than relying on registered intents. Regular skills declare coverage through INTENT-4; fallback skills receive the raw utterance at query time and decide for themselves — analogous to CONVERSE-1's per-skill poll.
What the spec covers
ovos.fallback.register/.deregister) with priority hint; session-scoped per INTENT-4 §11session.fallback_handlers(ordered preference list, same composition model as transformers)session.blacklisted_skills<skill_id>.fallback.ping/<skill_id>.fallback.pong); request carriesutterances+langso skill can parse the utterance itself<skill_id>:fallback(reserved intent name, PIPELINE-1 §7.3)fallback_high/medium/low) preserved via per-instance priority rangesCompanion edits (same PR)
ovos-pipeline-1.md§7.3 — reserve intent_namefallbackovos-session-1.md§3 — registerfallback_handlersfield