diff --git a/.claude/skills/debug-evals/SKILL.md b/.claude/skills/debug-evals/SKILL.md
index 238481f9..4a279e75 100644
--- a/.claude/skills/debug-evals/SKILL.md
+++ b/.claude/skills/debug-evals/SKILL.md
@@ -31,7 +31,7 @@ A run is one experiment span; its cases are direct children sharing its
   - `attributes->>'name'` — run label (the `--name` arg, or `{dataset}_qa_evaluation` / `{dataset}_retrieval_evaluation`).
   - `attributes->>'dataset_name'` — dataset.
   - `(attributes->>'assertion_pass_rate')::float` — overall judge pass rate (QA runs).
-  - `attributes->'logfire.experiment.metadata'->'metadata'` — run config: `target` (`rag-skill`|`analysis-skill`), `qa_model`, `embedder_model`, `chunk_size`, `search_limit`, `rerank_model`, `judge_model`, `skill_model`, etc.
+  - `attributes->'logfire.experiment.metadata'->'metadata'` — run config: `target` (`rag-capability`|`analysis-capability`), `qa_model`, `embedder_model`, `chunk_size`, `search_limit`, `rerank_model`, `judge_model`, `qa_max_searches`, etc.
   - `trace_id` — scopes the whole run.
 - Case span: `span_name = 'case: {case_name}'` (scope `pydantic-evals`).
   - `message` — `case: <id>`.
@@ -39,8 +39,8 @@ A run is one experiment span; its cases are direct children sharing its
   - `attributes->'scores'->'cited_map'->>'value'` — citation average precision (0..1).
   - `attributes->'scores'->'number_match'->>'value'` — numeric-answer match (datasets that use it).
   - `duration` — task time in seconds.
-- Inside each case the skill under test emits agent spans (scope `pydantic-ai`):
-  `execute {task}`, `agent run`, `running tool`, `chat {model}`.
+- Inside each case the capability under test emits agent spans (scope `pydantic-ai`):
+  `execute {task}`, `invoke_agent agent`, `execute_tool {tool_name}`, `chat {model}`.
 
 The service is `evals` regardless of model, so filter on `service_name = 'evals'`
 first. `otel_scope_name` separates the layers (`pydantic-evals` for run/case,
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a98db2e..70ecb1d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,10 +1,18 @@
 # Changelog
 ## [Unreleased]
 
+### Changed
+
+- Require `pydantic-ai-slim>=2.18,<3`.
+- `enable_thinking` maps onto Pydantic AI's unified `thinking` setting for the `anthropic`, `gemini`, `groq` and `bedrock` providers. The Anthropic thinking budget is now Pydantic AI's default of 10000 tokens, was 4096, and `max_tokens` must exceed it on budget-based Claude models; `enable_thinking: false` disables Gemini thinking rather than only hiding thoughts; Groq maps reasoning effort rather than `groq_reasoning_format`; Bedrock Qwen with `enable_thinking: false` no longer sends `reasoning_config`, while Bedrock-served Claude keeps an explicit `thinking: disabled`. The `openai` and `ollama` providers still map to `openai_reasoning_effort`.
+- `provider: bedrock` with a proprietary OpenAI model such as `openai.o3-mini-v1:0` raises `UserError`: Bedrock Converse serves only the `gpt-oss` family. Use `provider: bedrock-mantle`.
+- Tool failures raise `pydantic_ai.ToolFailed` instead of returning failure text: search and code-execution limits, sandbox execution errors, and `get_document`/`summarize_document` misses.
+
 ### Fixed
 
 - `Store.set_haiku_version` stamps the store's own config into a recreated settings row instead of the process-global `Config`.
 - `check_source_accessible` returns `False` for a URI it cannot resolve (unparseable host, unreadable path) instead of raising and aborting a full rebuild.
+- `evaluations run` opens the database read-only outside the population phase, so an embedder identity differing from the stored one warns instead of aborting the run.
 
 ### Removed
 
diff --git a/app/backend/pyproject.toml b/app/backend/pyproject.toml
index 9e9c9217..a6e3786b 100644
--- a/app/backend/pyproject.toml
+++ b/app/backend/pyproject.toml
@@ -6,7 +6,7 @@ requires-python = ">=3.12"
 dependencies = [
     "starlette>=0.50.0",
     "uvicorn[standard]>=0.40.0",
-    "pydantic-ai-slim[ag-ui,anthropic,openai]>=2.11.0,<3.0.0",
+    "pydantic-ai-slim[ag-ui,anthropic,openai]>=2.18.0,<3.0.0",
     "python-dotenv>=1.2.1",
     "haiku.rag-slim>=0.70.0",
     "logfire[pydantic-ai]>=3.17.0",
diff --git a/docs/configuration/providers.md b/docs/configuration/providers.md
index 46f01f75..78dcd3e8 100644
--- a/docs/configuration/providers.md
+++ b/docs/configuration/providers.md
@@ -54,7 +54,7 @@ See the [Pydantic AI thinking documentation](https://ai.pydantic.dev/thinking/)
 - **Anthropic**: All Claude models
 - **Google**: Gemini models with thinking support
 - **Groq**: Models with reasoning capabilities
-- **Bedrock**: Claude, OpenAI, and Qwen models
+- **Bedrock**: Claude, Qwen, and `gpt-oss` models. Bedrock Converse does not serve the proprietary OpenAI models, so configuring one raises an error. Reach those through `provider: bedrock-mantle`.
 - **Ollama**: Models supporting reasoning (gpt-oss, etc.)
 - **vLLM**: Models with a pydantic-ai reasoning profile (gpt-oss). Qwen3, Gemma, and similar templates ignore the OpenAI `reasoning_effort` that `enable_thinking` translates to — use [`extra_body`](#raw-provider-pass-through) to drive them.
 - **LM Studio**: Models supporting reasoning (gpt-oss, etc.)
@@ -63,6 +63,9 @@ See the [Pydantic AI thinking documentation](https://ai.pydantic.dev/thinking/)
 - Enable for QA, complex reasoning, and mathematical problems
 - Disable for speed-critical applications, title generation, and simple tasks
 
+!!! note "Anthropic thinking and max_tokens"
+    Anthropic requires `max_tokens` to exceed the thinking budget, and `enable_thinking: true` requests Pydantic AI's default budget of 10000 tokens. Set `max_tokens` above 10000 on Claude models that use budget-based thinking, or leave it unset on Sonnet 4.6+ and Opus 4.6+, which use adaptive thinking instead of a budget.
+
 !!! note "vLLM-served models without a reasoning profile"
     On `provider: openai` with a custom `base_url`, `enable_thinking` only takes effect for models whose pydantic-ai profile advertises reasoning support (o-series, gpt-5, gpt-oss). For other vLLM-served models (Qwen3, Gemma family, …) the field is a silent no-op. Reach the chat template's thinking switch directly via [`extra_body`](#raw-provider-pass-through).
 
diff --git a/evaluations/evaluations/benchmark.py b/evaluations/evaluations/benchmark.py
index bf2125f5..b23d1826 100644
--- a/evaluations/evaluations/benchmark.py
+++ b/evaluations/evaluations/benchmark.py
@@ -227,7 +227,7 @@ async def run_retrieval_benchmark(
     )
 
     db = spec.db_path(db_path)
-    async with HaikuRAG(db, config=config) as rag:
+    async with HaikuRAG(db, config=config, read_only=True) as rag:
 
         async def retrieval_target(question: str) -> list[str]:
             chunks = await rag.search(query=question, limit=5)
diff --git a/haiku_rag_slim/haiku/rag/capabilities/_base.py b/haiku_rag_slim/haiku/rag/capabilities/_base.py
index 7131364b..96b32c73 100644
--- a/haiku_rag_slim/haiku/rag/capabilities/_base.py
+++ b/haiku_rag_slim/haiku/rag/capabilities/_base.py
@@ -5,7 +5,7 @@ from pathlib import Path
 from typing import Any, cast
 
 from pydantic import BaseModel
-from pydantic_ai import ModelRetry, RunContext
+from pydantic_ai import ModelRetry, RunContext, ToolFailed
 from pydantic_ai.capabilities import AbstractCapability
 from pydantic_ai.messages import (
     InstructionPart,
@@ -198,16 +198,21 @@ class RAGCapabilityBase[StateT: BaseModel](AbstractCapability[Any]):
             self.outer_state[self.state_namespace] = self.state.model_dump(mode="json")
 
     async def _with_state(self, operation: Any) -> Any:
-        """Execute an operation and copy its state back to the host dependencies."""
-        result = await operation
-        self._sync_state()
-        return result
+        """Execute an operation and copy its state back to the host dependencies.
+
+        A failing tool still syncs, so evidence it gathered before the failure
+        reaches the host.
+        """
+        try:
+            return await operation
+        finally:
+            self._sync_state()
 
     async def _search(self, query: str, limit: int | None) -> str | ToolReturn:
         assert self.state is not None
         self.search_count += 1
         if self.search_count > self.config.qa.max_searches:
-            return (
+            raise ToolFailed(
                 "Search limit reached. Answer the question using "
                 "the results you already have."
             )
@@ -227,7 +232,10 @@ class RAGCapabilityBase[StateT: BaseModel](AbstractCapability[Any]):
     async def _cite(self, chunk_ids: list[str]) -> str:
         assert self.state is not None
         if not chunk_ids:
-            return "Registered 0 citations (empty chunk_ids)."
+            raise ModelRetry(
+                "No citations registered: chunk_ids was empty. Pass the chunk_ids "
+                "you want to cite, copied verbatim from search results."
+            )
 
         all_results: list[SearchResult] = []
         state = cast(Any, self.state)
diff --git a/haiku_rag_slim/haiku/rag/capabilities/analysis.py b/haiku_rag_slim/haiku/rag/capabilities/analysis.py
index 18a3cef9..de250785 100644
--- a/haiku_rag_slim/haiku/rag/capabilities/analysis.py
+++ b/haiku_rag_slim/haiku/rag/capabilities/analysis.py
@@ -4,7 +4,7 @@ from pathlib import Path
 from typing import Any
 
 from pydantic import BaseModel, Field
-from pydantic_ai import RunContext
+from pydantic_ai import RunContext, ToolFailed
 from pydantic_ai.messages import ToolReturn
 from pydantic_ai.toolsets import FunctionToolset
 
@@ -74,7 +74,7 @@ class AnalysisCapability(RAGCapabilityBase[AnalysisState]):
         assert self.state is not None
         self.execute_count += 1
         if self.execute_count > self.config.analysis.max_executions:
-            return (
+            raise ToolFailed(
                 "Code-execution limit reached. Give your final answer now from what "
                 "you already have; do not call analysis_execute_code again."
             )
@@ -96,9 +96,9 @@ class AnalysisCapability(RAGCapabilityBase[AnalysisState]):
                 success=result.success,
             )
         )
-        if result.success:
-            return result.stdout or "No output."
-        return f"Error: {result.stderr}\n\nOutput: {result.stdout}"
+        if not result.success:
+            raise ToolFailed(f"{result.stderr}\n\nOutput: {result.stdout}")
+        return result.stdout or "No output."
 
     def get_toolset(self) -> FunctionToolset[Any]:
         async def analysis_search(
diff --git a/haiku_rag_slim/haiku/rag/tools/document.py b/haiku_rag_slim/haiku/rag/tools/document.py
index 0f0f0385..f12062d6 100644
--- a/haiku_rag_slim/haiku/rag/tools/document.py
+++ b/haiku_rag_slim/haiku/rag/tools/document.py
@@ -1,5 +1,5 @@
 from pydantic import BaseModel
-from pydantic_ai import Agent, FunctionToolset, RunContext
+from pydantic_ai import Agent, FunctionToolset, RunContext, ToolFailed
 
 from haiku.rag.client import HaikuRAG
 from haiku.rag.config.models import AppConfig
@@ -123,14 +123,14 @@ def create_document_toolset(
             query: The document title or URI to look up.
 
         Returns:
-            Document content and metadata, or not found message.
+            Document content and metadata.
         """
         client = ctx.deps.client
 
         doc = await find_document(client, query)
 
         if doc is None:
-            return f"Document not found: {query}"
+            raise ToolFailed(f"Document not found: {query}")
 
         return (
             f"**{doc.title or 'Untitled'}**\n\n"
@@ -147,14 +147,14 @@ def create_document_toolset(
             query: The document title or URI to summarize.
 
         Returns:
-            Generated summary or not found message.
+            Generated summary.
         """
         client = ctx.deps.client
 
         doc = await find_document(client, query)
 
         if doc is None:
-            return f"Document not found: {query}"
+            raise ToolFailed(f"Document not found: {query}")
 
         summary_model = get_model(config.qa.model, config)
         summary_agent: Agent[None, str] = Agent(
diff --git a/haiku_rag_slim/haiku/rag/tools/search.py b/haiku_rag_slim/haiku/rag/tools/search.py
index acdf6425..4e8bf8e5 100644
--- a/haiku_rag_slim/haiku/rag/tools/search.py
+++ b/haiku_rag_slim/haiku/rag/tools/search.py
@@ -3,7 +3,7 @@ from collections.abc import Callable
 from io import BytesIO
 
 from PIL import Image
-from pydantic_ai import FunctionToolset, RunContext
+from pydantic_ai import FunctionToolset, RunContext, ToolFailed
 from pydantic_ai.messages import BinaryContent, ToolReturn
 
 from haiku.rag.config.models import AppConfig
@@ -68,8 +68,9 @@ def create_search_toolset(
         tool_name: Name for the search tool. Defaults to "search".
         on_results: Optional callback invoked with search results after each search.
             Useful for accumulating results externally (e.g., for citation resolution).
-        max_searches: Maximum number of searches allowed. When exceeded, returns
-            a message directing the agent to answer with existing results.
+        max_searches: Maximum number of searches allowed. When exceeded, the
+            tool fails with a message directing the agent to answer with
+            existing results.
 
     Returns:
         FunctionToolset with a search tool.
@@ -99,7 +100,7 @@ def create_search_toolset(
         rid = ctx.run_id or ""
         search_counts[rid] = search_counts.get(rid, 0) + 1
         if max_searches is not None and search_counts[rid] > max_searches:
-            return (
+            raise ToolFailed(
                 "Search limit reached. "
                 "Answer the question using the results you already have."
             )
diff --git a/haiku_rag_slim/haiku/rag/utils.py b/haiku_rag_slim/haiku/rag/utils.py
index 28c81833..98812deb 100644
--- a/haiku_rag_slim/haiku/rag/utils.py
+++ b/haiku_rag_slim/haiku/rag/utils.py
@@ -55,30 +55,35 @@ def image_binary_content(data: bytes) -> "BinaryContent":
 
 def apply_common_settings(
     settings: Any | None,
-    settings_class: type[Any],
     model_config: Any,
+    *,
+    map_thinking: bool = True,
 ) -> Any | None:
-    """Apply common settings (temperature, max_tokens) to model settings.
+    """Apply the settings every provider shares onto a model settings dict.
 
     Args:
         settings: Existing settings instance or None
-        settings_class: Settings class to instantiate if needed
         model_config: ModelConfig with temperature and max_tokens
+        map_thinking: Whether to map `enable_thinking` onto the unified
+            `thinking` setting. The OpenAI-compatible branches opt out and set
+            `openai_reasoning_effort` themselves, so that models whose profile
+            advertises thinking without OpenAI reasoning support (Ollama's
+            deepseek-r1, for one) keep receiving no `reasoning_effort`.
 
     Returns:
         Updated settings instance or None if no settings to apply
     """
+    thinking = model_config.enable_thinking if map_thinking else None
+
     if (
         model_config.temperature is None
         and model_config.max_tokens is None
         and model_config.extra_body is None
+        and thinking is None
     ):
         return settings
 
-    if settings is None:
-        settings_dict = settings_class()
-    else:
-        settings_dict = settings
+    settings_dict = {} if settings is None else settings
 
     if model_config.temperature is not None:
         settings_dict["temperature"] = model_config.temperature
@@ -89,6 +94,9 @@ def apply_common_settings(
     if model_config.extra_body is not None:
         settings_dict["extra_body"] = model_config.extra_body
 
+    if thinking is not None:
+        settings_dict["thinking"] = thinking
+
     return settings_dict
 
 
@@ -139,7 +147,7 @@ def get_model(
                 model_settings = OpenAIChatModelSettings(openai_reasoning_effort="high")
 
         model_settings = apply_common_settings(
-            model_settings, OpenAIChatModelSettings, model_config
+            model_settings, model_config, map_thinking=False
         )
 
         # Ollama's OpenAI-compatible API lives under /v1. Append it if the
@@ -173,7 +181,7 @@ def get_model(
                 )
 
         openai_settings = apply_common_settings(
-            openai_settings, OpenAIChatModelSettings, model_config
+            openai_settings, model_config, map_thinking=False
         )
 
         # Use model-level base_url if set (for vLLM, LM Studio, etc.)
@@ -188,75 +196,42 @@ def get_model(
         return OpenAIChatModel(model_name=model, settings=openai_settings)
 
     elif provider == "anthropic":
-        from anthropic.types.beta import (
-            BetaThinkingConfigDisabledParam,
-            BetaThinkingConfigEnabledParam,
-        )
+        from anthropic.types.beta import BetaThinkingConfigDisabledParam
         from pydantic_ai.models.anthropic import AnthropicModel, AnthropicModelSettings
 
         anthropic_settings: Any = None
 
-        # Apply thinking control
-        if model_config.enable_thinking is not None:
-            if model_config.enable_thinking:
-                thinking_config: BetaThinkingConfigEnabledParam = {
-                    "type": "enabled",
-                    "budget_tokens": 4096,
-                }
-                anthropic_settings = AnthropicModelSettings(
-                    anthropic_thinking=thinking_config
-                )
-            else:
-                thinking_disabled: BetaThinkingConfigDisabledParam = {
-                    "type": "disabled"
-                }
-                anthropic_settings = AnthropicModelSettings(
-                    anthropic_thinking=thinking_disabled
-                )
+        # Unified `thinking=False` omits the request field, which leaves the
+        # adaptive-thinking models (Sonnet 4.6+, Opus 4.6+) thinking by default.
+        disable_thinking = model_config.enable_thinking is False
+        if disable_thinking:
+            thinking_disabled: BetaThinkingConfigDisabledParam = {"type": "disabled"}
+            anthropic_settings = AnthropicModelSettings(
+                anthropic_thinking=thinking_disabled
+            )
 
         anthropic_settings = apply_common_settings(
-            anthropic_settings, AnthropicModelSettings, model_config
+            anthropic_settings, model_config, map_thinking=not disable_thinking
         )
 
         return AnthropicModel(model_name=model, settings=anthropic_settings)
 
     elif provider == "gemini":
-        from pydantic_ai.models.google import GoogleModel, GoogleModelSettings
+        from pydantic_ai.models.google import GoogleModel
 
-        gemini_settings: Any = None
-
-        # Apply thinking control
-        if model_config.enable_thinking is not None:
-            gemini_settings = GoogleModelSettings(
-                google_thinking_config={
-                    "include_thoughts": model_config.enable_thinking
-                }
-            )
-
-        gemini_settings = apply_common_settings(
-            gemini_settings, GoogleModelSettings, model_config
+        return GoogleModel(
+            model_name=model,
+            settings=apply_common_settings(None, model_config),
         )
 
-        return GoogleModel(model_name=model, settings=gemini_settings)
-
     elif provider == "groq":
-        from pydantic_ai.models.groq import GroqModel, GroqModelSettings
+        from pydantic_ai.models.groq import GroqModel
 
-        groq_settings: Any = None
-
-        # Apply thinking control
-        if model_config.enable_thinking is not None:
-            if model_config.enable_thinking:
-                groq_settings = GroqModelSettings(groq_reasoning_format="parsed")
-            else:
-                groq_settings = GroqModelSettings(groq_reasoning_format="hidden")
-
-        groq_settings = apply_common_settings(
-            groq_settings, GroqModelSettings, model_config
+        return GroqModel(
+            model_name=model,
+            settings=apply_common_settings(None, model_config),
         )
 
-        return GroqModel(model_name=model, settings=groq_settings)
-
     elif provider == "bedrock":
         from pydantic_ai.models.bedrock import (
             BedrockConverseModel,
@@ -265,41 +240,25 @@ def get_model(
 
         bedrock_settings: Any = None
 
-        # Apply thinking control for Claude models
-        if model_config.enable_thinking is not None:
-            additional_fields: dict[str, Any] = {}
-            if model.startswith("anthropic.claude"):
-                if model_config.enable_thinking:
-                    additional_fields = {
-                        "thinking": {"type": "enabled", "budget_tokens": 4096}
-                    }
-                else:
-                    additional_fields = {"thinking": {"type": "disabled"}}
-            elif "o1" in model or "o3" in model:
-                # OpenAI reasoning models on Bedrock (o-series only, not gpt-4o)
-                additional_fields = {
-                    "reasoning_effort": "high"
-                    if model_config.enable_thinking
-                    else "low"
-                }
-            elif "qwen" in model:
-                # Qwen models on Bedrock
-                additional_fields = {
-                    "reasoning_config": "high"
-                    if model_config.enable_thinking
-                    else "low"
-                }
-
-            if additional_fields:
-                bedrock_settings = BedrockModelSettings(
-                    bedrock_additional_model_requests_fields=additional_fields
-                )
-
-        bedrock_settings = apply_common_settings(
-            bedrock_settings, BedrockModelSettings, model_config
+        # Same omission as the direct Anthropic branch: unified `thinking=False`
+        # leaves the adaptive-thinking Claude models thinking. Bedrock ids are
+        # `[<geo>.]<family>.<model>`, as in `us.anthropic.claude-...`.
+        disable_claude_thinking = (
+            model_config.enable_thinking is False and "anthropic." in model
         )
+        if disable_claude_thinking:
+            bedrock_settings = BedrockModelSettings(
+                bedrock_additional_model_requests_fields={
+                    "thinking": {"type": "disabled"}
+                }
+            )
 
-        return BedrockConverseModel(model_name=model, settings=bedrock_settings)
+        return BedrockConverseModel(
+            model_name=model,
+            settings=apply_common_settings(
+                bedrock_settings, model_config, map_thinking=not disable_claude_thinking
+            ),
+        )
 
     else:
         # For any other provider, use string format and let Pydantic AI handle it
diff --git a/haiku_rag_slim/pyproject.toml b/haiku_rag_slim/pyproject.toml
index 2d604b2d..827ebaf3 100644
--- a/haiku_rag_slim/pyproject.toml
+++ b/haiku_rag_slim/pyproject.toml
@@ -29,7 +29,7 @@ dependencies = [
     "lancedb==0.34.0",
     "pathspec>=1.0.4",
     "pydantic>=2.12.5",
-    "pydantic-ai-slim[openai,logfire,ag-ui]>=2.11.0,<3.0.0",
+    "pydantic-ai-slim[openai,logfire,ag-ui]>=2.18.0,<3.0.0",
     "pydantic-monty>=0.0.17",
     "pypdfium2>=5.0",
     "python-dotenv>=1.2.2",
diff --git a/tests/capabilities/test_capabilities.py b/tests/capabilities/test_capabilities.py
index cce2e7e0..601082d1 100644
--- a/tests/capabilities/test_capabilities.py
+++ b/tests/capabilities/test_capabilities.py
@@ -4,7 +4,7 @@ from typing import Any, cast
 from unittest.mock import AsyncMock, patch
 
 import pytest
-from pydantic_ai import Agent, RunContext
+from pydantic_ai import Agent, ModelRetry, RunContext, ToolFailed
 from pydantic_ai.messages import (
     ModelRequest,
     ModelResponse,
@@ -291,13 +291,11 @@ async def test_search_and_empty_citation_limits(temp_db_path):
     capability = create_rag(db_path=temp_db_path, config=config)
     capability.state = RAGState()
 
-    result = await capability._search("anything", None)
+    with pytest.raises(ToolFailed, match="Search limit reached"):
+        await capability._search("anything", None)
 
-    assert (
-        result
-        == "Search limit reached. Answer the question using the results you already have."
-    )
-    assert await capability._cite([]) == "Registered 0 citations (empty chunk_ids)."
+    with pytest.raises(ModelRetry, match="chunk_ids was empty"):
+        await capability._cite([])
 
 
 @pytest.mark.asyncio
@@ -372,6 +370,75 @@ async def test_analysis_records_new_sandbox_search_results(temp_db_path):
     ]
 
 
+@pytest.mark.asyncio
+async def test_failed_tool_reaches_the_model_and_the_run_continues(temp_db_path):
+    """A `ToolFailed` tool leaves a failed result in history and answers anyway."""
+    config = AppConfig()
+    config.qa.max_searches = 0
+    calls = 0
+
+    def model_function(_messages, _info):
+        nonlocal calls
+        calls += 1
+        if calls == 1:
+            return ModelResponse(parts=[ToolCallPart("rag_search", {"query": "x"})])
+        return ModelResponse(parts=[TextPart("answered from what I had")])
+
+    agent = Agent(
+        FunctionModel(model_function),
+        deps_type=Deps,
+        capabilities=[
+            create_rag(db_path=temp_db_path, config=config, defer_loading=False)
+        ],
+    )
+
+    result = await agent.run("question", deps=Deps())
+
+    assert result.output == "answered from what I had"
+    failed = [
+        part
+        for message in result.all_messages()
+        for part in message.parts
+        if isinstance(part, ToolReturnPart) and part.outcome == "failed"
+    ]
+    assert [part.tool_name for part in failed] == ["rag_search"]
+    assert "Search limit reached" in str(failed[0].content)
+
+
+@pytest.mark.asyncio
+async def test_analysis_execution_limit_fails_the_tool(temp_db_path):
+    config = AppConfig()
+    config.analysis.max_executions = 0
+    capability = create_analysis(db_path=temp_db_path, config=config)
+    capability.state = AnalysisState()
+
+    with pytest.raises(ToolFailed, match="Code-execution limit reached"):
+        await capability._execute_code("print('done')")
+
+
+@pytest.mark.asyncio
+async def test_analysis_sandbox_failure_records_execution_and_fails_the_tool(
+    temp_db_path,
+):
+    capability = create_analysis(db_path=temp_db_path, config=AppConfig())
+    capability.state = AnalysisState()
+    capability.outer_state = {}
+    sandbox = AsyncMock()
+    sandbox.execute.return_value = SandboxResult(
+        stdout="partial", stderr="NameError: undefined", success=False
+    )
+    sandbox._search_results = []
+    capability.sandbox = cast(Sandbox, sandbox)
+
+    with pytest.raises(ToolFailed, match="NameError: undefined"):
+        await capability._with_state(capability._execute_code("boom"))
+
+    entry = capability.state.executions[-1]
+    assert entry.success is False
+    assert entry.stderr == "NameError: undefined"
+    assert capability.outer_state["analysis"]["executions"][-1]["code"] == "boom"
+
+
 @pytest.mark.asyncio
 async def test_native_agent_composition_initializes_host_state(temp_db_path):
     capability = create_rag(
diff --git a/tests/cassettes/test_search_tools/TestSearchMaxSearches.test_searches_beyond_limit_return_cap_message.yaml b/tests/cassettes/test_search_tools/TestSearchMaxSearches.test_searches_beyond_limit_fail_the_tool.yaml
similarity index 100%
rename from tests/cassettes/test_search_tools/TestSearchMaxSearches.test_searches_beyond_limit_return_cap_message.yaml
rename to tests/cassettes/test_search_tools/TestSearchMaxSearches.test_searches_beyond_limit_fail_the_tool.yaml
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 7616c653..ad3c78b1 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -237,6 +237,27 @@ def test_get_model_openai_non_reasoning_model_ignores_thinking():
     assert result._settings is None
 
 
+def test_get_model_vllm_model_without_reasoning_profile_sends_no_thinking():
+    """A vLLM-served model with no reasoning profile carries no thinking settings.
+
+    Its chat template reads the switch from `chat_template_kwargs`, which only
+    `extra_body` can reach, and the endpoint rejects `reasoning_effort`.
+    """
+    model_config = ModelConfig(
+        provider="openai",
+        name="Qwen/Qwen3-32B",
+        base_url="http://vllm:8000/v1",
+        enable_thinking=True,
+        temperature=0.2,
+    )
+    result = get_model(model_config)
+
+    assert isinstance(result, OpenAIChatModel)
+    assert result._settings is not None
+    assert "thinking" not in result._settings
+    assert "openai_reasoning_effort" not in result._settings
+
+
 def test_get_model_openai_extra_body_forwarded():
     """`extra_body` on ModelConfig is forwarded to ModelSettings.extra_body.
 
@@ -328,27 +349,41 @@ def test_get_model_anthropic():
 
 
 @pytest.mark.skipif(not HAS_ANTHROPIC, reason="Anthropic not installed")
-@pytest.mark.parametrize(
-    "enable_thinking,expected_thinking",
-    [
-        (True, {"type": "enabled", "budget_tokens": 4096}),
-        (False, {"type": "disabled"}),
-    ],
-)
-def test_get_model_anthropic_with_thinking(enable_thinking, expected_thinking):
+def test_get_model_anthropic_with_thinking():
     """Test get_model configures thinking for Anthropic."""
     from pydantic_ai.models.anthropic import AnthropicModel
 
     model_config = ModelConfig(
         provider="anthropic",
         name="claude-3-5-sonnet-20241022",
-        enable_thinking=enable_thinking,
+        enable_thinking=True,
     )
     result = get_model(model_config)
 
     assert isinstance(result, AnthropicModel)
     assert result.settings is not None
-    assert result.settings.get("anthropic_thinking") == expected_thinking
+    assert result.settings.get("thinking") is True
+
+
+@pytest.mark.skipif(not HAS_ANTHROPIC, reason="Anthropic not installed")
+def test_get_model_anthropic_thinking_off_disables_adaptive_models():
+    """Adaptive-thinking models think by default, so off must be explicit.
+
+    The unified `thinking=False` omits the request field, which leaves Sonnet
+    4.6+ and Opus 4.6+ thinking.
+    """
+    from pydantic_ai.models.anthropic import AnthropicModel
+
+    model_config = ModelConfig(
+        provider="anthropic", name="claude-sonnet-4-6", enable_thinking=False
+    )
+    result = get_model(model_config)
+
+    assert isinstance(result, AnthropicModel)
+    assert result.settings is not None
+    assert result.settings.get("anthropic_thinking") == {"type": "disabled"}
+    # The explicit disable replaces the unified key rather than joining it.
+    assert "thinking" not in result.settings
 
 
 @pytest.mark.skipif(not HAS_GOOGLE, reason="Google not installed")
@@ -362,15 +397,21 @@ def test_get_model_gemini():
 
 
 @pytest.mark.skipif(not HAS_GOOGLE, reason="Google not installed")
-def test_get_model_gemini_with_thinking():
+@pytest.mark.parametrize("enable_thinking", [True, False])
+def test_get_model_gemini_with_thinking(enable_thinking):
     """Test get_model configures thinking for Gemini."""
     from pydantic_ai.models.google import GoogleModel
 
     model_config = ModelConfig(
-        provider="gemini", name="gemini-2.0-flash-thinking-exp", enable_thinking=True
+        provider="gemini",
+        name="gemini-2.0-flash-thinking-exp",
+        enable_thinking=enable_thinking,
     )
     result = get_model(model_config)
+
     assert isinstance(result, GoogleModel)
+    assert result.settings is not None
+    assert result.settings.get("thinking") == enable_thinking
 
 
 @pytest.mark.skipif(not HAS_GROQ, reason="Groq not installed")
@@ -384,11 +425,9 @@ def test_get_model_groq():
 
 
 @pytest.mark.skipif(not HAS_GROQ, reason="Groq not installed")
-@pytest.mark.parametrize(
-    "enable_thinking,expected_format", [(True, "parsed"), (False, "hidden")]
-)
-def test_get_model_groq_with_thinking(enable_thinking, expected_format):
-    """Test get_model configures thinking format for Groq."""
+@pytest.mark.parametrize("enable_thinking", [True, False])
+def test_get_model_groq_with_thinking(enable_thinking):
+    """Test get_model configures thinking for Groq."""
     from pydantic_ai.models.groq import GroqModel
 
     model_config = ModelConfig(
@@ -400,7 +439,7 @@ def test_get_model_groq_with_thinking(enable_thinking, expected_format):
 
     assert isinstance(result, GroqModel)
     assert result.settings is not None
-    assert result.settings.get("groq_reasoning_format") == expected_format
+    assert result.settings.get("thinking") == enable_thinking
 
 
 @pytest.mark.skipif(not HAS_BEDROCK, reason="Bedrock not installed")
@@ -417,57 +456,81 @@ def test_get_model_bedrock():
 
 @pytest.mark.skipif(not HAS_BEDROCK, reason="Bedrock not installed")
 @pytest.mark.parametrize(
-    "name,enable_thinking,expected_fields",
+    "name",
     [
-        (
-            "anthropic.claude-3-5-sonnet-20241022-v2:0",
-            True,
-            {"thinking": {"type": "enabled", "budget_tokens": 4096}},
-        ),
-        (
-            "anthropic.claude-3-5-sonnet-20241022-v2:0",
-            False,
-            {"thinking": {"type": "disabled"}},
-        ),
-        ("openai.o3-mini-v1:0", True, {"reasoning_effort": "high"}),
-        ("openai.o3-mini-v1:0", False, {"reasoning_effort": "low"}),
-        ("qwen.qwen3-32b-v1:0", True, {"reasoning_config": "high"}),
-        ("qwen.qwen3-32b-v1:0", False, {"reasoning_config": "low"}),
-        # A family with no reasoning mapping leaves the request fields untouched.
-        ("meta.llama3-70b-instruct-v1:0", True, None),
-        ("meta.llama3-70b-instruct-v1:0", False, None),
-    ],
-    ids=[
-        "claude_on",
-        "claude_off",
-        "o_series_on",
-        "o_series_off",
-        "qwen_on",
-        "qwen_off",
-        "unmapped_on",
-        "unmapped_off",
+        "anthropic.claude-3-5-sonnet-20241022-v2:0",
+        "openai.gpt-oss-120b-1:0",
+        "qwen.qwen3-32b-v1:0",
+        "meta.llama3-70b-instruct-v1:0",
     ],
+    ids=["claude", "gpt_oss", "qwen", "unmapped"],
 )
-def test_get_model_bedrock_with_thinking(name, enable_thinking, expected_fields):
-    """Each Bedrock model family maps thinking onto its own request field."""
+def test_get_model_bedrock_with_thinking(name):
+    """Every Bedrock family carries the unified thinking setting."""
     from pydantic_ai.models.bedrock import BedrockConverseModel
 
     model_config = ModelConfig(
         provider="bedrock",
         name=name,
-        enable_thinking=enable_thinking,
+        enable_thinking=True,
     )
     result = get_model(model_config)
 
     assert isinstance(result, BedrockConverseModel)
-    if expected_fields is None:
-        assert result.settings is None
-        return
     assert result.settings is not None
-    assert (
-        result.settings.get("bedrock_additional_model_requests_fields")
-        == expected_fields
+    assert result.settings.get("thinking") is True
+
+
+@pytest.mark.skipif(not HAS_BEDROCK, reason="Bedrock not installed")
+@pytest.mark.parametrize(
+    "name",
+    [
+        "anthropic.claude-sonnet-4-6-20260514-v1:0",
+        "us.anthropic.claude-sonnet-4-6-20260514-v1:0",
+    ],
+    ids=["plain", "cross_region"],
+)
+def test_get_model_bedrock_thinking_off_disables_adaptive_claude(name):
+    """Bedrock omits the field for adaptive Claude, which leaves it thinking."""
+    from pydantic_ai.models.bedrock import BedrockConverseModel
+
+    model_config = ModelConfig(provider="bedrock", name=name, enable_thinking=False)
+    result = get_model(model_config)
+
+    assert isinstance(result, BedrockConverseModel)
+    assert result.settings is not None
+    assert result.settings.get("bedrock_additional_model_requests_fields") == {
+        "thinking": {"type": "disabled"}
+    }
+    # The explicit disable replaces the unified key rather than joining it.
+    assert "thinking" not in result.settings
+
+
+@pytest.mark.skipif(not HAS_BEDROCK, reason="Bedrock not installed")
+def test_get_model_bedrock_thinking_off_leaves_non_claude_families_alone():
+    """Only the Anthropic variant takes a `thinking` request field."""
+    from pydantic_ai.models.bedrock import BedrockConverseModel
+
+    model_config = ModelConfig(
+        provider="bedrock", name="qwen.qwen3-32b-v1:0", enable_thinking=False
     )
+    result = get_model(model_config)
+
+    assert isinstance(result, BedrockConverseModel)
+    assert result.settings is not None
+    assert "bedrock_additional_model_requests_fields" not in result.settings
+    assert result.settings.get("thinking") is False
+
+
+@pytest.mark.skipif(not HAS_BEDROCK, reason="Bedrock not installed")
+def test_get_model_bedrock_rejects_mantle_only_model():
+    """Proprietary OpenAI models are Bedrock Mantle-only, not served by Converse."""
+    from pydantic_ai.exceptions import UserError
+
+    model_config = ModelConfig(provider="bedrock", name="openai.o3-mini-v1:0")
+
+    with pytest.raises(UserError):
+        get_model(model_config)
 
 
 def test_get_model_unknown_provider():
@@ -491,7 +554,7 @@ def test_get_package_versions():
     assert "docling_document_schema" in versions
 
     # All should be non-empty strings
-    for key, value in versions.items():
+    for value in versions.values():
         assert isinstance(value, str)
         assert len(value) > 0
 
@@ -504,7 +567,7 @@ def test_apply_common_settings_no_settings():
     from haiku.rag.utils import apply_common_settings
 
     mc = ModelConfig(provider="openai", name="gpt-4o")
-    result = apply_common_settings(None, dict, mc)
+    result = apply_common_settings(None, mc)
     assert result is None
 
 
@@ -513,7 +576,7 @@ def test_apply_common_settings_temperature():
     from haiku.rag.utils import apply_common_settings
 
     mc = ModelConfig(provider="openai", name="gpt-4o", temperature=0.7)
-    result = apply_common_settings(None, dict, mc)
+    result = apply_common_settings(None, mc)
     assert result is not None
     assert result["temperature"] == 0.7
 
@@ -523,7 +586,7 @@ def test_apply_common_settings_max_tokens():
     from haiku.rag.utils import apply_common_settings
 
     mc = ModelConfig(provider="openai", name="gpt-4o", max_tokens=500)
-    result = apply_common_settings(None, dict, mc)
+    result = apply_common_settings(None, mc)
     assert result is not None
     assert result["max_tokens"] == 500
 
@@ -534,7 +597,7 @@ def test_apply_common_settings_existing():
 
     mc = ModelConfig(provider="openai", name="gpt-4o", temperature=0.5)
     existing = {"some_key": "value"}
-    result = apply_common_settings(existing, dict, mc)
+    result = apply_common_settings(existing, mc)
     assert result is not None
     assert result["temperature"] == 0.5
     assert result["some_key"] == "value"
diff --git a/tests/tools/test_document.py b/tests/tools/test_document.py
index ab935cf4..967a1bf8 100644
--- a/tests/tools/test_document.py
+++ b/tests/tools/test_document.py
@@ -2,6 +2,7 @@ from pathlib import Path
 from types import SimpleNamespace
 
 import pytest
+from pydantic_ai import ToolFailed
 
 from haiku.rag.tools.document import (
     DocumentInfo,
@@ -130,9 +131,9 @@ class TestDocumentToolExecution:
 
         get_tool = toolset.tools["get_document"]
         ctx = make_ctx(doc_client)
-        result = await get_tool.function(ctx, "nonexistent")
 
-        assert "Document not found" in result
+        with pytest.raises(ToolFailed, match="Document not found: nonexistent"):
+            await get_tool.function(ctx, "nonexistent")
 
     @pytest.mark.asyncio
     async def test_list_documents_with_base_filter(self, doc_client, doc_config):
@@ -183,9 +184,9 @@ class TestSummarizeDocumentTool:
 
         summarize_tool = toolset.tools["summarize_document"]
         ctx = make_ctx(doc_client)
-        result = await summarize_tool.function(ctx, "nonexistent document")
 
-        assert "Document not found" in result
+        with pytest.raises(ToolFailed, match="Document not found: nonexistent"):
+            await summarize_tool.function(ctx, "nonexistent document")
 
     @pytest.mark.vcr()
     @pytest.mark.asyncio
diff --git a/tests/tools/test_search.py b/tests/tools/test_search.py
index 2cd8499e..60bf3404 100644
--- a/tests/tools/test_search.py
+++ b/tests/tools/test_search.py
@@ -2,6 +2,7 @@ from pathlib import Path
 from types import SimpleNamespace
 
 import pytest
+from pydantic_ai import ToolFailed
 
 from haiku.rag.store.models import SearchResult
 from haiku.rag.tools.search import create_search_toolset
@@ -139,26 +140,22 @@ class TestSearchMaxSearches:
         search_tool = toolset.tools["search"]
         ctx = make_ctx(search_client)
 
-        result1 = await search_tool.function(ctx, "Python")
-        assert "Search limit reached" not in result1
-
-        result2 = await search_tool.function(ctx, "JavaScript")
-        assert "Search limit reached" not in result2
+        assert await search_tool.function(ctx, "Python")
+        assert await search_tool.function(ctx, "JavaScript")
 
     @pytest.mark.asyncio
-    async def test_searches_beyond_limit_return_cap_message(
+    async def test_searches_beyond_limit_fail_the_tool(
         self, search_client, search_config
     ):
-        """Searches beyond max_searches return limit message."""
+        """Searches beyond max_searches fail with the limit message."""
         toolset = create_search_toolset(search_config, max_searches=1)
         search_tool = toolset.tools["search"]
         ctx = make_ctx(search_client)
 
-        result1 = await search_tool.function(ctx, "Python")
-        assert "Search limit reached" not in result1
+        assert await search_tool.function(ctx, "Python")
 
-        result2 = await search_tool.function(ctx, "JavaScript")
-        assert "Search limit reached" in result2
+        with pytest.raises(ToolFailed, match="Search limit reached"):
+            await search_tool.function(ctx, "JavaScript")
 
     @pytest.mark.asyncio
     async def test_counter_resets_across_runs(self, search_client, search_config):
@@ -167,15 +164,13 @@ class TestSearchMaxSearches:
         search_tool = toolset.tools["search"]
 
         ctx_run1 = make_ctx(search_client, run_id="run-1")
-        result = await search_tool.function(ctx_run1, "Python")
-        assert "Search limit reached" not in result
+        assert await search_tool.function(ctx_run1, "Python")
 
-        result2 = await search_tool.function(ctx_run1, "JavaScript")
-        assert "Search limit reached" in result2
+        with pytest.raises(ToolFailed, match="Search limit reached"):
+            await search_tool.function(ctx_run1, "JavaScript")
 
         ctx_run2 = make_ctx(search_client, run_id="run-2")
-        result3 = await search_tool.function(ctx_run2, "Python")
-        assert "Search limit reached" not in result3
+        assert await search_tool.function(ctx_run2, "Python")
 
     @pytest.mark.asyncio
     async def test_no_limit_by_default(self, search_client, search_config):
@@ -185,8 +180,7 @@ class TestSearchMaxSearches:
         ctx = make_ctx(search_client)
 
         for _ in range(5):
-            result = await search_tool.function(ctx, "Python")
-            assert "Search limit reached" not in result
+            assert await search_tool.function(ctx, "Python")
 
 
 @pytest.fixture
diff --git a/uv.lock b/uv.lock
index a09266d1..03a7efcd 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1768,7 +1768,7 @@ requires-dist = [
     { name = "pydantic-ai-slim", extras = ["google"], marker = "extra == 'vertexai'" },
     { name = "pydantic-ai-slim", extras = ["groq"], marker = "extra == 'groq'" },
     { name = "pydantic-ai-slim", extras = ["mistral"], marker = "extra == 'mistral'" },
-    { name = "pydantic-ai-slim", extras = ["openai", "logfire", "ag-ui"], specifier = ">=2.11.0,<3.0.0" },
+    { name = "pydantic-ai-slim", extras = ["openai", "logfire", "ag-ui"], specifier = ">=2.18.0,<3.0.0" },
     { name = "pydantic-ai-slim", extras = ["voyageai"], marker = "extra == 'voyageai'" },
     { name = "pydantic-monty", specifier = ">=0.0.17" },
     { name = "pypdfium2", specifier = ">=5.0" },
@@ -3826,7 +3826,7 @@ email = [
 
 [[package]]
 name = "pydantic-ai-slim"
-version = "2.16.0"
+version = "2.18.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "genai-prices" },
@@ -3837,9 +3837,9 @@ dependencies = [
     { name = "pydantic-graph" },
     { name = "typing-inspection" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/76/6a/3048579c646f4cea7966889009a1d7eef1365f9126393945d39cefad9e83/pydantic_ai_slim-2.16.0.tar.gz", hash = "sha256:36d17cb12edd72ffc62f9e06cc49ac5f23cb77cf6b665c4b1fd11c00dbe6a852", size = 889343, upload-time = "2026-07-23T02:47:20.696Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/4b/39/c3a941027be87f6bc07e50e1e72ae93e66a1b11b838e33ad5d135d2fe2f0/pydantic_ai_slim-2.18.0.tar.gz", hash = "sha256:dfe47a3602049f779223702a684ed8091b111cfae1851236616d6b0eb3b0b077", size = 902113, upload-time = "2026-07-25T01:21:05.614Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/2e/95/2c79b9f8e875562bae8141078af27428120e8415d493bb07ea36ca5905f9/pydantic_ai_slim-2.16.0-py3-none-any.whl", hash = "sha256:7cad27fb8f45ce4af4e8da83d7f206a3e1038dbc7535625c0ce5518fe378a55d", size = 1077057, upload-time = "2026-07-23T02:47:12.633Z" },
+    { url = "https://files.pythonhosted.org/packages/bf/a0/a0619bddf602f69a754540cb82147f9b53dfa2d093e1fe7051c5e6a8eceb/pydantic_ai_slim-2.18.0-py3-none-any.whl", hash = "sha256:4c4076166a63ad96fe6ed5a517223c4a5aba6c9682a17d8d0ac42839cbc83622", size = 1091565, upload-time = "2026-07-25T01:20:57.323Z" },
 ]
 
 [package.optional-dependencies]
@@ -3949,7 +3949,7 @@ wheels = [
 
 [[package]]
 name = "pydantic-evals"
-version = "2.16.0"
+version = "2.18.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "anyio" },
@@ -3959,14 +3959,14 @@ dependencies = [
     { name = "pyyaml" },
     { name = "rich" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/52/f5/7c2bf8ce45da52ed70c030e91ce43747317f61bd0615a40e91f1ec515c70/pydantic_evals-2.16.0.tar.gz", hash = "sha256:717e9615c7688650cdc716046f1d8edfbe0bac1748286c0a2744e3689fb518c7", size = 85147, upload-time = "2026-07-23T02:47:22.089Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/fd/4a/e2b629f4724a6026c792a5bd7ceb470bf38d48c6a2ebe8cec091ed85485f/pydantic_evals-2.18.0.tar.gz", hash = "sha256:d26ab006290564a5e56394b9033fbd5925e4a172d9e23be5f3c034ae3637eb18", size = 85222, upload-time = "2026-07-25T01:21:07.101Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/f0/f6/d7f20f976f81d073856138bd046bf1ce5dc96561391526753c1c9076d33c/pydantic_evals-2.16.0-py3-none-any.whl", hash = "sha256:6705b427ea7c77d7f6b7d152ced6f86728931eceb9c57a8aa07ab8225fb1a934", size = 100439, upload-time = "2026-07-23T02:47:14.523Z" },
+    { url = "https://files.pythonhosted.org/packages/1c/8d/be8abc897f9cd9ef83e000bfaa8d9bec0d93fe2f59f219d2c3835d66b033/pydantic_evals-2.18.0-py3-none-any.whl", hash = "sha256:98d20973df83c3ca6d7341ce2f704ae59b53e02698b55df765f9a1cd5ec5ea1d", size = 100524, upload-time = "2026-07-25T01:20:59.284Z" },
 ]
 
 [[package]]
 name = "pydantic-graph"
-version = "2.16.0"
+version = "2.18.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "httpx" },
@@ -3974,9 +3974,9 @@ dependencies = [
     { name = "pydantic" },
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 [[package]]