add SKILL for harness, including a reference to code mode (#228)

Add a harness agent skill

  Documents Code Mode for Pydantic AI, following the agentskills.io spec and matching the existing building-pydantic-ai-agents skill.

  - Skill directory matches the name field (spec requirement)
  - Deps aligned with pyproject.toml: pydantic-ai-slim>=1.95.1 plus the code-mode install extra
  - MCP quick-start passes native=False so CodeMode wraps the tools
  - Documents the Monty timing-primitive restriction; adds a Code Mode API section
  - Examples linted via pytest-examples (model-free ones executed) so they can't go stale
This commit is contained in:
gordonblackadder
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---
name: pydantic-ai-harness
description: Extend Pydantic AI agents with batteries-included capabilities from pydantic-ai-harness — currently Code Mode, which collapses many tool calls into one sandboxed Python execution. Use when the user mentions pydantic-ai-harness, CodeMode, Monty, code mode, or tool sandboxing, when they want an agent to run agent-written Python, or when a Pydantic AI agent would benefit from orchestrating multiple tool calls in a single sandboxed script.
license: MIT
compatibility: Requires Python 3.10+ and pydantic-ai-slim>=1.95.1
metadata:
version: "0.1.0"
author: pydantic
---
# Building with Pydantic AI Harness
Pydantic AI Harness is the official capability library for Pydantic AI. Capabilities that need model or
framework support — and those fundamental to every agent — live in core `pydantic-ai`; optional,
batteries-included capabilities live here. Both are composed onto an agent through the same
`capabilities=[...]` API.
This skill covers the capabilities shipped by `pydantic-ai-harness`. For the core framework — agents,
tools, structured output, hooks, and testing — use the `building-pydantic-ai-agents` skill instead.
## When to Use This Skill
Invoke this skill when:
- The user mentions `pydantic-ai-harness`, `CodeMode`, code mode, or the Monty sandbox
- An agent makes many sequential tool calls that could collapse into one sandboxed Python execution
- The user wants the model to write Python that loops, branches, aggregates, or parallelizes tool calls with `asyncio.gather`
- The user asks to sandbox or constrain the code an agent runs
Do **not** use this skill for:
- Core Pydantic AI usage — building agents, adding tools, structured output, streaming, or testing (use `building-pydantic-ai-agents`)
- Capabilities that ship in core `pydantic-ai`, such as web search, tool search, and thinking
- The Pydantic validation library on its own (`pydantic`/`BaseModel` without agents)
## Supported Capabilities
| Capability | Description | Reference |
|---|---|---|
| `CodeMode` | Wraps eligible tools into a single sandboxed `run_code` tool so the model orchestrates them in Python | [Code Mode](./references/CODE-MODE.md) |
More capability areas are tracked in the
[capability matrix](https://github.com/pydantic/pydantic-ai-harness#capability-matrix); as they stabilize,
this skill grows to cover them.
## Install
```bash
uv add pydantic-ai-harness
```
Each capability declares its own extra. Code Mode needs the Monty sandbox:
```bash
uv add "pydantic-ai-harness[codemode]" # `code-mode` is also accepted as an alias
```
Requires Python 3.10+ and `pydantic-ai-slim>=1.95.1`.
## Quick Start
A harness capability is added to the agent like any other. Here `CodeMode` wraps an MCP server's tools into
a single `run_code` tool that the model drives with Python.
```python {test="skip"}
from pydantic_ai import Agent
from pydantic_ai.capabilities import MCP # MCP ships in core pydantic-ai
from pydantic_ai_harness import CodeMode
agent = Agent(
'anthropic:claude-sonnet-4-6',
capabilities=[
# native=False routes the MCP tools through a local toolset so CodeMode can wrap them.
# Without it, providers with native MCP run the tools server-side and bypass the sandbox.
MCP('https://hn.caseyjhand.com/mcp', native=False),
CodeMode(),
],
)
result = agent.run_sync(
'Across the top and best Hacker News feeds, find the most-discussed story with at '
'least 100 points and summarize its comment thread in one paragraph.'
)
print(result.output)
#> The most-discussed story clearing 100 points is ...
```
Instead of one model round-trip per tool call, the model writes a single Python script that fetches both
feeds with `asyncio.gather`, dedupes and ranks them in plain Python, and pulls the winning thread —
collapsing many calls into one `run_code`.
## Key Practices
- **Confirm a harness capability is actually needed.** If core Pydantic AI tools and capabilities are enough, use the `building-pydantic-ai-agents` skill instead — don't reach for the harness by default.
- **Read the reference before writing code.** Each capability has its own configuration, constraints, and gotchas — load the linked reference (e.g. [Code Mode](./references/CODE-MODE.md)) first.
- **Install the capability's extra.** Importing `CodeMode` without `pydantic-ai-harness[codemode]` raises an `ImportError`; the Monty sandbox is an optional dependency.
## Common Gotchas
- **`native=True` tools bypass `CodeMode`.** Provider-native MCP servers and web search execute server-side, so `run_code` never sees them. Construct them with `native=False` to keep them local and wrappable.
- **The Monty sandbox is a Python subset.** No class definitions, no third-party imports, and only a small stdlib allowlist — read [Code Mode](./references/CODE-MODE.md#sandbox-restrictions) before debugging generated code that fails to run.
- **`CodeMode` needs its extra.** Install `pydantic-ai-harness[codemode]`, not the bare package.
@@ -0,0 +1,176 @@
# Code Mode
Standard tool calling takes one model round-trip per tool call. `CodeMode` wraps eligible tools into a
single `run_code` tool so the model can write Python that loops, branches, aggregates, and parallelizes tool work inside a sandbox.
Use it when the agent needs to call several tools, transform intermediate results, run concurrent
tool work with `asyncio.gather`, or anywhere a simple Python script is more reliable than the model alone, such as for mathematics.
## Install
Code Mode needs the Monty sandbox, pulled in by the `codemode` extra:
```bash
uv add "pydantic-ai-harness[codemode]" # `code-mode` is also accepted as an alias
```
## Basic Pattern
```python {test="skip"}
from pydantic_ai import Agent
from pydantic_ai_harness import CodeMode
agent = Agent('anthropic:claude-sonnet-4-6', capabilities=[CodeMode()])
@agent.tool_plain
def get_weather(city: str) -> dict:
return {'city': city, 'temp_f': 72, 'condition': 'sunny'}
@agent.tool_plain
def convert_temp(fahrenheit: float) -> float:
return round((fahrenheit - 32) * 5 / 9, 1)
```
The model could generate code like:
```python {test="skip" lint="skip"}
paris, tokyo = await asyncio.gather(
get_weather(city='Paris'),
get_weather(city='Tokyo'),
)
paris_c = await convert_temp(fahrenheit=paris['temp_f'])
tokyo_c = await convert_temp(fahrenheit=tokyo['temp_f'])
{'paris': paris_c, 'tokyo': tokyo_c}
```
This reduces four model round-trips to one.
## Choose Which Tools Are Sandboxed
The `tools` parameter controls which tools move behind `run_code`.
```python
from pydantic_ai_harness import CodeMode
CodeMode(tools='all')
CodeMode(tools=['search', 'fetch'])
CodeMode(tools=lambda ctx, td: td.name != 'dangerous_tool')
CodeMode(tools={'code_mode': True})
```
Metadata-based selection is useful when the project already groups tools into toolsets:
```python {test="skip" lint="skip"}
from pydantic_ai import Agent
from pydantic_ai.toolsets import FunctionToolset
from pydantic_ai_harness import CodeMode
search_tools = FunctionToolset(tools=[search, fetch]).with_metadata(code_mode=True)
agent = Agent(
'anthropic:claude-sonnet-4-6',
toolsets=[search_tools],
capabilities=[CodeMode(tools={'code_mode': True})],
)
```
Non-matching tools remain regular tool calls.
## Return Values
`run_code` captures the last expression automatically.
| Scenario | Return |
| --- | --- |
| No print output | Last expression value |
| With print output | `{"output": "<printed text>", "result": <last expression>}` |
| Multimodal content | Returned natively for model processing |
If the user expects a raw dict or list back, avoid unnecessary `print()` statements.
## Retries
```python
from pydantic_ai_harness import CodeMode
CodeMode(
tools='all',
max_retries=3,
)
```
Use `max_retries` when sandbox execution errors are expected to be recoverable.
If the generated code fails during sandbox execution, the error message is sent back to the model, and it is asked to redraft the code in light of that failure. This process is repeated up to `max_retries` times, or until the code executes successfully.
## REPL State
State persists between `run_code` calls during the same agent run. Imports, variables, and helper
functions carry over until the run ends. Use `restart: true` in the tool call to reset state when the
conversation has drifted or stale state is causing wrong behavior.
## Sandbox Restrictions
Code runs inside Monty, an implementation of Python which intentionally supports only a subset of features.
Key restrictions:
- No class definitions
- No third-party imports
- No `import *`
- Only a small stdlib subset is allowed: `sys`, `typing`, `asyncio`, `math`, `json`, `re`, `datetime`, `os`, `pathlib`
- No wall-clock or timing primitives: `asyncio.sleep`, `datetime.datetime.now()`, `datetime.date.today()`, and the `time` module are unavailable
- Tools that need approval or deferred execution are excluded from the sandbox
When a generated example keeps failing, check these restrictions before changing the rest of the agent.
## API
```python {test="skip" lint="skip"}
CodeMode(
tools: ToolSelector = 'all', # 'all', list[str], callable, or dict
max_retries: int = 3, # retries on sandbox execution errors
)
```
## Agent Specs
When the user defines the agent in YAML or JSON, the loader needs to know how to build `CodeMode`:
```yaml
model: anthropic:claude-sonnet-4-6
capabilities:
- CodeMode: {}
```
```python {test="skip"}
from pydantic_ai import Agent
from pydantic_ai_harness import CodeMode
agent = Agent.from_file('agent.yaml', custom_capability_types=[CodeMode])
```
The same pattern applies when passing arguments:
```yaml
capabilities:
- CodeMode:
tools: ['search', 'fetch']
max_retries: 5
```
## Observability
With Logfire or another OpenTelemetry backend, nested tool calls inside `run_code` produce child spans.
That makes CodeMode much easier to debug than a plain blob of generated code.
```python {test="skip" lint="skip"}
for msg in result.all_messages():
for part in msg.parts:
if isinstance(part, ToolReturnPart) and part.tool_name == 'run_code':
tool_calls = part.metadata['tool_calls'] # dict[str, ToolCallPart]
tool_returns = part.metadata['tool_returns'] # dict[str, ToolReturnPart]
```
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@@ -65,6 +65,7 @@ dev = [
'logfire[httpx]>=4.31.0',
"dirty-equals>=0.9.0",
"inline-snapshot>=0.32.5",
"pytest-examples>=0.0.18",
]
lint = [
'ruff>=0.14',
@@ -104,6 +105,8 @@ max-complexity = 15
convention = 'google'
[tool.ruff.format]
# don't format python in docstrings, pytest-examples takes care of it
docstring-code-format = false
quote-style = 'single'
[tool.pyright]
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@@ -0,0 +1,74 @@
from __future__ import annotations as _annotations
import os
from collections.abc import Iterable
from dataclasses import dataclass, field
from pathlib import Path
import pytest
from _pytest.mark import ParameterSet
from pytest_examples import CodeExample, EvalExample, find_examples
from pytest_examples.config import ExamplesConfig as BaseExamplesConfig
@dataclass
class ExamplesConfig(BaseExamplesConfig):
known_first_party: list[str] = field(default_factory=list[str])
def ruff_config(self) -> tuple[str, ...]:
config = super().ruff_config()
if self.known_first_party: # pragma: no branch
config = (*config, '--config', f'lint.isort.known-first-party = {self.known_first_party}')
return config
def find_skill_examples() -> Iterable[ParameterSet]:
# Skill examples are package assets for agents, not executable docs pages.
# Lint them to catch stale Python snippets without running model/file-system examples.
# Genuinely illustrative fragments (e.g. sandbox-side code the model would generate)
# opt out with a `lint="skip"` fence directive.
root_dir = Path(__file__).parent.parent
os.chdir(root_dir)
# `find_examples` yields paths relative to the cwd we just set, so use them as-is.
for ex in find_examples('pydantic_ai_harness/.agents'):
yield pytest.param(ex, id=f'{ex.path}:{ex.start_line}')
@pytest.mark.parametrize('example', find_skill_examples())
def test_skill_examples(example: CodeExample, eval_example: EvalExample):
# Lint every snippet to catch stale imports/syntax, and additionally execute the ones
# that need no live model, network, or external file -- those exercise the real
# constructor/decorator signatures at runtime. Snippets that need a model, network, or
# file (or are illustrative fragments) opt out with `test="skip"` / `lint="skip"`
# fence directives; model-backed flows are covered by `test_readme_quick_start.py`.
# Run with `--update-examples` to reformat snippets and regenerate their printed output.
prefix = example.prefix_settings()
# Snippets default to black's 88-column width (matching pydantic-ai's docs examples);
# a snippet can widen this with a `line_length="..."` fence directive.
line_length = int(prefix.get('line_length', '88'))
eval_example.config = ExamplesConfig(
ruff_ignore=['D', 'Q001'],
target_version='py310',
line_length=line_length,
isort=True,
upgrade=True,
quotes='single',
known_first_party=['pydantic_ai_harness'],
)
if not prefix.get('lint', '').startswith('skip'):
if eval_example.update_examples: # pragma: lax no cover
eval_example.format_ruff(example)
else:
eval_example.lint_ruff(example)
if prefix.get('test', '').startswith('skip'):
pytest.skip('running skipped for this example')
if eval_example.update_examples: # pragma: lax no cover
eval_example.run_print_update(example)
else:
eval_example.run_print_check(example)
Generated
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