feat(agents): enforce one librarian timeout budget

- add LIBRARIAN_TIMEOUT config (default 180s) and enforce it with
  asyncio.wait_for inside delegate_to_librarian, covering the live
  paths (steward direct delegation and SSE streaming) that had no cap
- timeouts fail honestly: success=False with a curated butler sentence,
  detail in logs
- set an explicit timeout on TatlockOllamaProvider's AsyncOpenAI client
  from OLLAMA_TIMEOUT instead of the SDK default (~600s per LLM call)
- remove the contradictory unused 60s default from
  AgentRequest.timeout_seconds; coordination falls back to the
  configured budget

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- **One librarian timeout budget** - new `LIBRARIAN_TIMEOUT` (default 180s) enforced with `asyncio.wait_for` inside `delegate_to_librarian`, capping the previously uncapped live paths (steward direct delegation and streaming). The Ollama provider's AsyncOpenAI client now carries an explicit `OLLAMA_TIMEOUT` instead of the SDK's ~600s default, and the contradictory unused 60s default in `AgentRequest.timeout_seconds` was removed (None defers to the configured budget)
 - **Search degradation signaling** - The librarian client parses `source_counts` (plus the additive `source_status`/`degraded` fields when a newer library-desk sends them; absence is tolerated), and `hybrid_search` appends a one-line coverage note when a search is degraded or an enabled source leg contributed nothing, so outages are visible to the model and the user
 
 ### Fixed

src/agents/coordination.py

@@ -24,6 +24,7 @@ from src.agents.protocol import (
     DelegationIntent,
     DelegationReason,
 )
+from src.core.config import config
 from src.core.household_registry import get_household_registry
 from src.core.logging_config import get_logger
 
@@ -138,8 +139,8 @@ class CoordinationEngine:
                 delegation_reason=intent.reason,
             )
 
-            # Execute with timeout
+            # Execute with timeout (explicit request value or configured budget)
-            timeout = request.timeout_seconds or 60
+            timeout = request.timeout_seconds or config.LIBRARIAN_TIMEOUT
 
             result = await asyncio.wait_for(
                 executor(

src/agents/delegation.py

@@ -8,10 +8,12 @@ returns a structured result for synthesis.
 This implements the agent-as-tool pattern recommended by PydanticAI:
 agents call other agents via tool wrappers, keeping each agent focused.
 """
+import asyncio
 from collections.abc import AsyncGenerator
 from dataclasses import dataclass, field
 from enum import Enum
 
+from src.core.config import config
 from src.core.logging_config import get_logger
 from src.core.tracing import SpanType, trace_span
 
@@ -252,8 +254,14 @@ async def delegate_to_librarian(
         },
     ) as span:
         try:
-            # Use run() not run_stream() - avoids Ollama bug
+            # Use run() not run_stream() - avoids Ollama bug.
-            output = await run_librarian(task=task, context=context)
+            # One timeout budget for the whole delegation - covers both
+            # live paths (steward direct delegation and streaming), which
+            # previously had no cap at all (SDK default ~600s per LLM call).
+            output = await asyncio.wait_for(
+                run_librarian(task=task, context=context),
+                timeout=config.LIBRARIAN_TIMEOUT,
+            )
 
             logger.info(
                 "delegation_to_librarian_completed",
@@ -275,6 +283,30 @@ async def delegate_to_librarian(
                 output=output,
             )
 
+        except TimeoutError:
+            logger.error(
+                "delegation_to_librarian_timeout",
+                task=task[:50],
+                timeout_seconds=config.LIBRARIAN_TIMEOUT,
+            )
+
+            if span:
+                span.metadata["success"] = False
+                span.details["error"] = (
+                    f"timed out after {config.LIBRARIAN_TIMEOUT}s"
+                )
+
+            return DelegationResult(
+                expert_name="librarian",
+                task=task,
+                success=False,
+                output=(
+                    "I'm afraid the research took longer than expected "
+                    "and had to be abandoned, sir."
+                ),
+                error="The Librarian did not respond within the time budget.",
+            )
+
         except Exception as e:
             logger.error(
                 "delegation_to_librarian_error",

src/agents/protocol.py

@@ -6,7 +6,7 @@ Defines standardized request/response formats for communication between:
 - Tatlock (coordination) → Expert agents (Librarian, Developer, etc.)
 """
 from enum import Enum
-from typing import Any, Optional
+from typing import Any
 
 from pydantic import BaseModel, Field
 
@@ -53,13 +53,16 @@ class AgentRequest(BaseModel):
         default="default",
         description="User identifier for multi-tenant operations"
     )
-    max_tokens: Optional[int] = Field(
+    max_tokens: int | None = Field(
         default=None,
         description="Optional token limit for response"
     )
-    timeout_seconds: Optional[int] = Field(
+    timeout_seconds: int | None = Field(
-        default=60,
+        default=None,
-        description="Maximum time for task completion"
+        description=(
+            "Maximum time for task completion; None uses the configured "
+            "expert budget (LIBRARIAN_TIMEOUT)"
+        )
     )
 
 
@@ -103,7 +106,7 @@ class AgentResponse(BaseModel):
         default_factory=list,
         description="Sources or references used"
     )
-    error_message: Optional[str] = Field(
+    error_message: str | None = Field(
         default=None,
         description="Error details if success=False"
     )

src/core/config.py

@@ -42,7 +42,7 @@ class Environment(str, Enum):
 class Config(BaseSettings):
     """
     Global application configuration.
-    
+
     Loads from environment variables and .env file.
     Domain-specific configs should be in their respective modules.
     """
@@ -52,18 +52,18 @@ class Config(BaseSettings):
         case_sensitive=True,
         extra="ignore",
     )
-    
+
     # Application
     APP_NAME: str = "OpenAI-Compatible API"
     APP_VERSION: str = Field(default_factory=_get_version_from_pyproject)
     ENVIRONMENT: Environment = Environment.DEVELOPMENT
     DEBUG: bool = Field(default=False, description="Debug mode")
-    
+
     # API Configuration
     API_HOST: str = Field(default="0.0.0.0", description="API host")
     API_PORT: int = Field(default=8000, description="API port")
     API_PREFIX: str = Field(default="/v1", description="API route prefix")
-    
+
     # Anthropic Configuration (Claude - cloud fallback)
     ANTHROPIC_API_KEY: str | None = Field(
         default=None,
@@ -125,6 +125,10 @@ class Config(BaseSettings):
     )
 
     # Library-Desk Configuration (The Librarian backend)
+    LIBRARIAN_TIMEOUT: int = Field(
+        default=180,
+        description="Total time budget for a librarian delegation in seconds"
+    )
     LIBRARY_DESK_HOST: HttpUrl = Field(
         default="http://localhost:8089",
         description="Library-Desk API URL"
@@ -259,7 +263,7 @@ class Config(BaseSettings):
 def get_config() -> Config:
     """
     Get cached configuration instance.
-    
+
     Uses lru_cache to ensure config is loaded once and reused.
     """
     return Config()

src/ollama/provider.py

@@ -40,14 +40,21 @@ class TatlockOllamaProvider(OllamaProvider):
         # Override the client with our sanitized version
         self._openai_client = _SanitizedAsyncOpenAI(base_url=base_url)
 
-        logger.debug("tatlock_ollama_provider_created", base_url=base_url)
+        logger.debug(
+            "tatlock_ollama_provider_created",
+            base_url=base_url,
+            timeout=config.OLLAMA_TIMEOUT,
+        )
 
 
 class _SanitizedAsyncOpenAI(AsyncOpenAI):
     """AsyncOpenAI client that sanitizes messages before sending."""
 
     def __init__(self, **kwargs: Any):
-        # Ollama doesn't need an API key
+        # Ollama doesn't need an API key. Cap each LLM call at the
+        # configured Ollama timeout instead of the SDK default (~600s),
+        # so one stuck request cannot eat the whole delegation budget.
+        kwargs.setdefault("timeout", float(config.OLLAMA_TIMEOUT))
         super().__init__(api_key="ollama", **kwargs)
 
     @property

tests/agents/test_delegation.py

@@ -193,6 +193,30 @@ class TestDelegateToLibrarian:
             assert "Connection refused" not in result.error
             assert "internal" not in result.error
 
+    @pytest.mark.asyncio
+    async def test_delegate_to_librarian_timeout(self, monkeypatch):
+        """Delegation is capped by LIBRARIAN_TIMEOUT and fails honestly."""
+        import asyncio
+
+        from src.core.config import config
+
+        async def slow_run(task, context=""):
+            await asyncio.sleep(5)
+            return "too late"
+
+        monkeypatch.setattr(config, "LIBRARIAN_TIMEOUT", 0.05)
+
+        with patch(
+            "src.agents.librarian.agent.run_librarian",
+            new=slow_run,
+        ):
+            result = await delegate_to_librarian(task="Search for information")
+
+        assert result.success is False
+        assert "longer than expected" in result.output
+        assert result.error is not None
+        assert "time budget" in result.error
+
     @pytest.mark.asyncio
     async def test_delegate_to_librarian_preserves_task(self):
         """Test delegation result preserves original task."""

tests/agents/test_protocol.py

@@ -27,7 +27,8 @@ class TestAgentRequest:
 
         assert request.task == "Find information about Docker"
         assert request.context == ""
-        assert request.timeout_seconds == 60
+        # No hardcoded default - None defers to the configured budget
+        assert request.timeout_seconds is None
 
     def test_request_with_context(self):
         """Test request with additional context."""

tests/ollama/test_provider.py

@@ -0,0 +1,54 @@
+"""
+Tests for TatlockOllamaProvider configuration.
+
+The AsyncOpenAI client must carry an explicit timeout from
+config.OLLAMA_TIMEOUT instead of the SDK default (~600s), so a stuck
+LLM call cannot consume the whole delegation budget.
+"""
+
+import pytest
+
+from src.core.config import config
+from src.ollama.provider import TatlockOllamaProvider, _sanitize_messages
+
+
+@pytest.mark.unit
+class TestProviderTimeout:
+    """Timeout configuration on the underlying AsyncOpenAI client."""
+
+    def test_openai_client_timeout_from_config(self):
+        provider = TatlockOllamaProvider(base_url="http://localhost:11434/v1")
+
+        assert provider._openai_client.timeout == float(config.OLLAMA_TIMEOUT)
+
+    def test_timeout_is_not_sdk_default(self):
+        provider = TatlockOllamaProvider(base_url="http://localhost:11434/v1")
+
+        # The OpenAI SDK defaults to 600s; the configured cap must win
+        assert provider._openai_client.timeout < 600
+
+
+@pytest.mark.unit
+class TestMessageSanitization:
+    """Null content sanitization for Ollama compatibility."""
+
+    def test_null_content_with_tool_calls_becomes_empty_string(self):
+        messages = [
+            {
+                "role": "assistant",
+                "content": None,
+                "tool_calls": [{"id": "call_1", "type": "function"}],
+            }
+        ]
+
+        sanitized = _sanitize_messages(messages)
+
+        assert sanitized[0]["content"] == ""
+
+    def test_regular_messages_unchanged(self):
+        messages = [
+            {"role": "user", "content": "Hello"},
+            {"role": "assistant", "content": "Good day, sir."},
+        ]
+
+        assert _sanitize_messages(messages) == messages