[samuelcolvin]

Adds logfire.agent_sandboxes(), which returns a pydantic_monty.AsyncMontyWebsocket pool connected to Logfire Agent Sandboxes.

async with logfire.agent_sandboxes() as pool:
    async with pool.checkout() as session:
        result = await session.feed_run('1 + 1')

• It's a plain def returning the pool, which is already an async context manager, so async with logfire.agent_sandboxes() works without an await.
• The API key comes from the api_key argument, then configure(api_key=...), then LOGFIRE_API_KEY. Without one it raises LogfireConfigError.
• The URL is wss://<region host>/monty-ws/, derived from the key's region through advanced.generate_base_url(), so advanced.base_url for self-hosted is respected. url= overrides it.
• It sends Authorization: Bearer <key>. A user-supplied connect_headers is merged in and wins on conflicts.
• It calls instrument_monty() by default; pass instrument=False to skip it.
• The other AsyncMontyWebsocket kwargs are inlined with Monty's defaults.
• Requires the new agent-sandboxes extra (pydantic-monty-client>=1.0.0), which is also forwarded by the logfire meta package.
• The logfire-api shim raises RuntimeError, because there's no no-op pool it could return.

Docs are in #2670 so this can be released for beta testing first. agent_sandboxes is filtered out of reference/api/logfire.md until then.

Tests in tests/test_agent_sandboxes.py use a local WebSocket relay to a real monty subprocess, so code actually runs end to end. I haven't run the full suite locally; CI will tell.

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[github-actions]

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
logfire-api/logfire_api
__init__.py
logfire-sdk/logfire
__init__.py
logfire-sdk/logfire/_internal
agent_sandboxes.py
main.py
Project Total

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[Copilot]

🟡 Changes recommended

Header merging must handle case-insensitive names so user-supplied authorization reliably overrides the default.

1 open issue

• Normalize header names before merging credential overrides · New

What changed in this PR

Adds logfire.agent_sandboxes() to connect the Python SDK to hosted Pydantic Monty sandbox pools, with API-key authentication and optional tracing. Public documentation is deferred to #2670.

Changes:

• Adds the pool factory with regional URL selection, configurable headers, and Monty options.
• Exposes the API through the SDK and shim, with an agent-sandboxes installation extra.
• Adds local WebSocket integration tests and temporarily hides the API from generated reference docs.

File	Description
uv.lock	Records the new extra and dependency wiring.
tests/​test_logfire_api.py	Checks shim availability and its unsupported-operation error.
tests/​test_agent_sandboxes.py	Tests execution, authentication, URLs, instrumentation, and dependency errors.
logfire/​pyproject.toml	Forwards the sandbox extra to the SDK.
logfire-sdk/​pyproject.toml	Adds the Monty client dependency extra.
logfire-sdk/​logfire/​_internal/​main.py	Defines the public sandbox method and options.
logfire-sdk/​logfire/​_internal/​agent_sandboxes.py	Constructs authenticated sandbox pools.
logfire-sdk/​logfire/​__init__.py	Exports the module-level API.
logfire-api/​logfire_api/​__init__.py	Adds the shim method with an explicit error.
docs/​reference/​api/​logfire.md	Hides the API pending the documentation release.

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All reported issues were addressed across 3 files (changes from recent commits).

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[coderabbitai]

Walkthrough

The SDK adds an agent_sandboxes method that creates a Monty WebSocket client. It supports API-key and URL configuration, optional instrumentation, connection headers, and forwarded pool options. The new optional dependency and module-level exports make the feature available through the SDK and package API. The fallback API raises an installation-guidance error. Tests cover connection behavior, configuration, option forwarding, and API availability.

Priority: Normal

Merge Risk: Low · up to 80521

Sandbox creation can fail when LOGFIRE_API_KEY is set after configuration. The PR is mergeable with owner awareness, though the fallback should be fixed.

Pre-merge checks: 3 · 1

Failed checks: 1 inconclusive

Check name	Status	Explanation	Resolution
Title check		The title "ASB" is too vague to identify the primary change, although the changeset adds Agent Sandboxes support.	Use a concise, descriptive title such as "Add logfire.agent_sandboxes() support".

Passed checks: 3 passed

Check name	Status	Explanation
Description check		The description clearly explains the new logfire.agent_sandboxes() API, configuration behavior, dependency changes, fallback behavior, and tests.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @logfire-sdk/logfire/_internal/agent_sandboxes.py:
- Line 38: Update the agent-sandbox factory’s api_key resolution so it checks
LOGFIRE_API_KEY at call time when both the explicit api_key and config.api_key
are absent, while preserving the existing precedence for provided keys.

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Reviewing files that changed from the base of the PR and between c711ee6 and 8052199.

Files ignored due to path filters: 1

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Files selected for processing: 9

• docs/reference/api/logfire.md
• logfire-api/logfire_api/__init__.py
• logfire-sdk/logfire/__init__.py
• logfire-sdk/logfire/_internal/agent_sandboxes.py
• logfire-sdk/logfire/_internal/main.py
• logfire-sdk/pyproject.toml
• logfire/pyproject.toml
• tests/test_agent_sandboxes.py
• tests/test_logfire_api.py

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• pydantic/logfire (manual)
• pydantic/pydantic-ai (manual)

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