**Stacked on top of #19962.**
## Summary
- `NativeModelToolProvider` lived under `providers/` and had the
`*-tool.provider.ts` suffix, but it never implemented `ToolProvider`,
wasn't in `TOOL_PROVIDERS`, had no descriptors, and wasn't executed by
`ToolExecutorService`. The shape misled readers.
- It's actually a **parallel concept**: a binder that produces
SDK-native tool objects (Anthropic `webSearch`, OpenAI `webSearch`,
etc.) which the AI SDK passes straight to the model. Opaque, not
serializable, never in the catalog, never dispatched by the executor.
- This PR renames + moves it to reflect that.
## Renames
| Before | After |
|---|---|
| `NativeModelToolProvider` (class) | `NativeToolBinderService` |
| `NativeToolProvider` (interface) | `NativeToolBinder` |
| `generateTools(context)` (method) | `bind(context)` |
| `providers/native-model-tool.provider.ts` |
`native/native-tool-binder.service.ts` |
| `interfaces/native-tool-provider.interface.ts` |
`native/native-tool-binder.interface.ts` |
## What doesn't change
- `ToolCategory.NATIVE_MODEL` enum stays (still used by
`getToolsByCategories`).
- `isAvailable()` signature unchanged.
- `WebSearchService.shouldUseNativeSearch()` toggle untouched — that's
product-level and belongs to a separate PR that handles the Exa
coexistence story.
- No behavior change. Pure rename + move.
## Why this matters for the broader architecture
This rename makes the native/binder concept **visible in the type system
and directory structure**. That's what later enables coexisting native +
custom tools (e.g., `web_search` native alongside `exa_web_search`
custom) without the current naming collision, because native tools are
no longer masquerading as a registry provider.
## Stats
- 5 files, +30 / −28.
- Blast radius: 4 files modified, 1 file renamed (git tracks as rename).
- Typecheck clean (7 pre-existing unrelated errors, zero new).
- Prettier clean.
## Test plan
- [ ] `npx nx typecheck twenty-server` passes
- [ ] AI chat: native `web_search` still works end-to-end when enabled
- [ ] Workflow AI agent: `ToolCategory.NATIVE_MODEL` still works (goes
through `bind()` now)
- [ ] MCP: unaffected (doesn't use native tools)
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
