feat(tools): add Fly.io Sprites command execution tool - #7328
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Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughAdds ChangesFly.io Sprites execution
Sequence Diagram(s)sequenceDiagram
participant Agent
participant SpritesExecTool
participant SpritesClient
participant BoundedWSCommand
participant Sprite
Agent->>SpritesExecTool: Submit command and optional cwd
SpritesExecTool->>SpritesClient: Create client with API token
SpritesClient->>Sprite: Create bash command
SpritesExecTool->>BoundedWSCommand: Execute with timeout and output limit
BoundedWSCommand->>Sprite: Read WebSocket frames
Sprite-->>BoundedWSCommand: Return output and exit frames
BoundedWSCommand-->>SpritesExecTool: Return bounded output and exit code
SpritesExecTool-->>Agent: Return command result
Merge Risk: ⚪ Minimal · up to The tool implementation, packaging, and documentation have no remaining actionable merge-blocking issue. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@lib/crewai-tools/src/crewai_tools/tools/sprites_tool/sprites_exec_tool.py`:
- Line 111: Update SpritesExecTool._run to avoid capture_output=True buffering
the entire command result; use a streaming SDK path or enforce the output limit
server-side so collection stops at max_output_chars. Preserve truncation
behavior and add a regression test proving output exceeding the configured cap
stops at that cap.
- Line 143: Update _arun so cancellation does not leave an unbounded _run
operation occupying the executor: use the SDK session handle and invoke
kill_session when cancellation occurs, while preserving normal command execution
and result handling. If session cancellation cannot be integrated, enforce
bounded concurrency and document the remote command behavior.
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docs/docs.jsondocs/edge/ar/tools/ai-ml/spritestool.mdxdocs/edge/en/tools/ai-ml/spritestool.mdxdocs/edge/ko/tools/ai-ml/spritestool.mdxdocs/edge/pt-BR/tools/ai-ml/spritestool.mdxlib/crewai-tools/pyproject.tomllib/crewai-tools/src/crewai_tools/__init__.pylib/crewai-tools/src/crewai_tools/tools/__init__.pylib/crewai-tools/src/crewai_tools/tools/sprites_tool/__init__.pylib/crewai-tools/src/crewai_tools/tools/sprites_tool/sprites_exec_tool.pylib/crewai-tools/tests/tools/test_sprites_exec_tool.py
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Intercept output before sprites-py accumulates it and retain UTF-8 character prefixes. Await SDK WebSocket I/O directly, including CrewAI structured-tool dispatch, so cancellation does not occupy shared executor workers. Add receive-loop, UTF-8, cancellation, timeout, and cleanup regressions; document definitions and synchronize safety notes across all four locales. Validation: 257 relevant tests, Ruff, focused mypy, Bandit, and sdist/wheel builds pass. Two unchanged legacy description assertions also fail with the original implementation. Signed-off-by: Matt Pearce <mattp@fly.io>
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Related issue
Fixes #7327
Summary
Add
SpritesExecTooltocrewai-toolsso agents can run shell commands in an existing, persistent Fly.io Sprite.commandand optionalcwdto the agent.sprites-pySDK through the optionalcrewai-tools[sprites]extra. Import the SDK lazily so other tools do not require it.Verification
Automated checks
crewai-toolssource; changed Python files passed formatting checks.--follow-imports=silent).Local Python validation used 3.13.12. CrewAI's local credential store was redirected to a temporary directory for the tests, and telemetry/tracing was disabled.
Live smoke test
15 checks passed against a disposable, token-protected Fly.io Sprite using CrewAI 1.15.20 and
sprites-py0.6.0. These covered remote Python execution, stdout/stderr and nonzero exits, working directories, file persistence across tool instances, repeated commands, output truncation, structured-tool invocation, concurrent async calls, timeout handling, and subsequent Sprite usability.The full CrewAI Crew/Agent/tool loop also executed a real command and verified its remote output file. The model was deterministic and local: this tests CrewAI dispatch and the Sprites integration, not a particular LLM provider's tool-selection behavior. No paid LLM calls were used. Both disposable Sprites used during validation were deleted and confirmed absent afterward; existing Sprites were not modified.
Additional context
Safety limits are documented: shell commands can modify/delete data and access resources inside the Sprite; a client timeout or async cancellation does not guarantee remote process termination; output truncation happens after SDK capture and therefore limits agent context, not memory consumption. The tool does not automatically retry commands whose outcome is uncertain.
AI disclosure: this contribution was developed with an AI coding assistant. Please apply the required
llm-generatedlabel; GitHub rejects my account's attempt to add labels in this repository.