research: CAP model handling, model-as-tool and skill delegation (cap-protocol, +59 sources, 2 conclusions)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
2026-10-25 18:24:40 +01:00
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+# OpenAI Agents SDK: Tools (agents as tools)
+
+## Metadata
+
+| Field | Value |
+|---|---|
+| Institute | Molodetz Institute — Research & Retrieval Division |
+| Subject | cap-protocol |
+| Document type | Source Dossier |
+| Tier | 1 |
+| Source title | OpenAI Agents SDK: Tools (agents as tools) |
+| Source URL | https://openai.github.io/openai-agents-python/tools/ |
+| Source publisher / author | OpenAI |
+| Source type | vendor docs |
+| Source date (published) | Unknown — not stated |
+| Date researched | 2026-10-25 |
+| Researched by | tai (agent), model: Claude Sonnet 5, on behalf of retoor |
+| Research method | direct page fetch |
+| Confidence | High |
+| Status | Active |
+
+## Summary
+
+The SDK page that defines `Agent.as_tool()`: exposing a specialist agent to a manager as a callable tool instead of handing the conversation over.
+
+## Key findings
+
+- The agent-as-tool run has its own state: the parent run's conversation state is not inherited automatically; pass the same `session` to share client-managed history.
+- The nested run's final output is returned to the parent as the tool result; `custom_output_extractor` can reshape it first.
+- `is_enabled` takes a boolean, a callable or an async function; disabled tools are completely hidden from the LLM at runtime.
+- By default the tool expects an object with one string field `input`; a Pydantic model or dataclass via `parameters` replaces that, and `include_input_schema=True` adds the JSON Schema to the nested input.
+- If `needs_approval` requires a decision, the nested run pauses and the pending items surface in `result.interruptions`.
+- Guidance: use a central agent that orchestrates specialists 'instead of handing off control'.
+
+## Pros / strengths
+
+Concrete, small API that names the knobs a delegation tool needs: input schema, output extractor, enable switch, approval pause.
+
+## Cons / limitations / caveats
+
+Describes the SDK's API, not measured outcomes; the handoff comparison lives on another page.
+
+## Relevance to tai
+
+Template for the shape of a tai `ask_agent` tool: structured input, nested run in its own context, only the final output returned, an enable switch and an approval hook.
+
+## Changelog
+
+| Date | Change |
+|---|---|
+| 2026-10-25 | Initial dossier created. |