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Adds a `TTSProvider(ABC)` + `register_tts_provider()` extension point to the plugin context API, **alongside** the existing config-driven `tts.providers.<name>: type: command` registry from PR #17843. This is additive — the command-provider surface stays as the primary way to add a TTS backend. The hook covers cases the shell-template grammar can't reasonably express: - Native Python SDKs without a CLI (Cartesia, Fish Audio, etc.) - Streaming synthesis (chunked Opus → voice-bubble delivery) - Voice metadata API for the `hermes tools` picker - OAuth-refreshing auth flows None of the 10 inline built-in providers (`edge`, `openai`, `elevenlabs`, `minimax`, `gemini`, `mistral`, `xai`, `piper`, `kittentts`, `neutts`) are migrated to plugins. They stay inline. The hook is for *new* engines that aren't built-in. ## Resolution order The dispatcher's resolution order is the load-bearing invariant: 1. `tts.provider` is a built-in name → built-in dispatch. **Always wins.** 2. `tts.provider` matches `tts.providers.<name>` with `command:` set → command-provider dispatch (PR #17843). 3. `tts.provider` matches a plugin-registered `TTSProvider` → plugin dispatch (new). 4. No match → falls through to Edge TTS default (legacy behavior). Built-ins-always-win is enforced at THREE layers: - Registry: `register_provider()` rejects shadowing names with a warning. - Dispatcher: `_dispatch_to_plugin_provider()` short-circuits built-in names defensively before consulting the registry. - Picker: `_plugin_tts_providers()` filters built-in shadows out of the `hermes tools` row list defensively. Command-providers-win-over-plugins is enforced at TWO layers: - The caller in `text_to_speech_tool` checks `_resolve_command_provider_config` first. - `_dispatch_to_plugin_provider` re-checks for a same-name command config defensively so a refactor of the caller can't silently break the invariant. ## New files - `agent/tts_provider.py` — `TTSProvider(ABC)` with `synthesize()` (required), `list_voices()`, `list_models()`, `get_setup_schema()`, `stream()`, `voice_compatible` (all optional with sane defaults). Mirrors `agent/image_gen_provider.py` shape. - `agent/tts_registry.py` — `register_provider`/`get_provider`/`list_providers` with `_BUILTIN_NAMES` reject-shadowing invariant. Mirrors `agent/image_gen_registry.py` shape. - `plugins/tts/...` directory ready for community plugins (none shipped). ## Modified files - `hermes_cli/plugins.py` — `register_tts_provider()` method on `PluginContext`. Matches the gating shape of `register_image_gen_provider()` / `register_browser_provider()`. - `tools/tts_tool.py` — `_dispatch_to_plugin_provider()` + `_plugin_provider_is_voice_compatible()` + walrus-elif wiring into the main dispatcher. Built-in elif chain untouched. - `hermes_cli/tools_config.py` — `_plugin_tts_providers()` injects plugin rows into the Text-to-Speech picker category alongside the 10 hardcoded built-in rows. ## Tests - `tests/agent/test_tts_registry.py` — 47 tests covering registration, lookup, ABC contract, helpers, AND a `TestBuiltinSync` regression test that fails if `agent.tts_registry._BUILTIN_NAMES` drifts from `tools.tts_tool.BUILTIN_TTS_PROVIDERS` (kept duplicated due to circular import constraints). - `tests/tools/test_tts_plugin_dispatch.py` — 35 tests covering built-in-always-wins, command-wins-over-plugin, plugin dispatch, exception passthrough, voice_compatible helper. - `tests/hermes_cli/test_tts_picker.py` — 10 tests covering the picker surface, builtin shadowing defense, integration with `_visible_providers`. - `tests/hermes_cli/test_plugins_tts_registration.py` — 3 end-to-end tests via `PluginManager.discover_and_load()`. - `tests/plugins/tts/check_parity_vs_main.py` — 9-scenario subprocess parity harness vs `origin/main`. The only intentional diff is `fallback_edge → plugin` for the `plugin-installed` scenario. ## Verification - 95/95 new tests pass. - 170/170 pre-existing TTS tests (test_tts_command_providers, test_tts_max_text_length, test_tts_speed, etc.) pass unchanged. - Parity harness against `origin/main`: 8 OK + 1 expected DIFF. - E2E smoke: a registered plugin's `synthesize()` is called via `text_to_speech_tool` with the standard JSON envelope returned. - Ruff clean on all touched files. ## Docs - `website/docs/user-guide/features/tts.md` — new "Python plugin providers" section with a decision table (command-provider vs plugin), minimal plugin example, and the optional-hook reference. - `website/docs/user-guide/features/plugins.md` — TTS row updated to mention both surfaces (command-provider primary, plugin for SDK/streaming). Closes #30398 |
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