feat(tools): add Velaris tools: sandboxed execution of agent-written code with effect budgets - #7279
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feat(tools): add Velaris tools: sandboxed execution of agent-written code with effect budgets#7279gowrishankar-infra wants to merge 7 commits into
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…dgets Adds VelarisAuditTool, VelarisRunTool and VelarisCardTool. VelarisRunTool runs agent-written Velaris programs under an effect budget chosen by the crew's author (default: io only); effects outside it are refused at run time. Includes tests, a README, the velaris optional extra, and the regenerated tool specifications. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018tQF3M3r9Eupg1A4SfKVQe
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Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughVelaris tools now support optional installation, public exports, effect auditing, bounded execution, resource limits, tool specifications, documentation, and validation tests. Legacy compiler versions use a bounded subprocess path. ChangesVelaris tool integration
Sequence Diagram(s)sequenceDiagram
participant CrewAI as CrewAI caller
participant VelarisRunTool
participant VelarisLang as velaris-lang
participant Subprocess as bounded subprocess
CrewAI->>VelarisRunTool: Provide source, arguments, stdin, effect budget, timeout, and memory limit
VelarisRunTool->>VelarisLang: Execute with native limits when supported
VelarisRunTool->>Subprocess: Execute legacy compiler with timeout and platform memory limit
VelarisLang-->>VelarisRunTool: Return output or execution diagnostics
Subprocess-->>VelarisRunTool: Return output, timeout, memory, or compiler status
VelarisRunTool-->>CrewAI: Return formatted execution report
Merge Risk: 🔵 Low · up to Velaris adds bounded program execution with effect controls and resource limits. Timeout behavior is covered at the stopped-result level, but the timeout-specific result code is not verified, leaving a bounded regression risk in diagnostic reporting. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 24 functions across 5 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@lib/crewai-tools/src/crewai_tools/tools/velaris_tool/velaris_tool.py`:
- Line 180: Update the execution flow around velaris.run so agent-provided code
runs in a killable subprocess or container rather than synchronously in the
worker, enforcing wall-time and memory limits and returning a controlled timeout
result when either limit is exceeded.
In `@lib/crewai-tools/tests/tools/test_velaris_tool.py`:
- Around line 54-55: Update the assertions for the VelarisRunTool refusal
response to verify that "failed" is absent, alongside the existing checks for
"REFUSED", "'fs'", and absence of "READ IT".
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… and memory limits VelarisRunTool now passes timeout (default 30 s) and max_memory_mb (default 512) to velaris.run, which runs the program in a killable subprocess and reports E610/E611 when a limit is hit; the tool reports STOPPED with the limit. Limits need velaris-lang 2.59.0; with an older compiler they are skipped and the program runs unbounded. Tests gain a refusal-does-not-reach-fail-branch assertion, a timeout test and a defaults test. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018tQF3M3r9Eupg1A4SfKVQe
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Inline comments:
In `@lib/crewai-tools/tests/tools/test_velaris_tool.py`:
- Around line 81-84: Strengthen the assertion in the relevant Velaris timeout
test to verify the timeout-specific message, such as “ran longer than 2
seconds.”, appears in out. Keep the existing assertions that confirm the stopped
result and absence of the end marker.
- Around line 75-78: Raise the project’s minimum velaris-lang requirement to
2.59.0 and regenerate uv.lock so CI resolves a supported compiler version.
Preserve the _supports_limits(velaris) skip behavior for older compiler
versions.
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… compiler version When the installed velaris-lang predates velaris.run's own timeout and max_memory_mb (added in 2.59.0), VelarisRunTool now runs the compiler as its own killable subprocess with subprocess.run(timeout=...) and, on POSIX, an RLIMIT_AS cap, mapping the outcome to the same STOPPED, REFUSED and error reports. The timeout test no longer skips on the locked 2.57.0. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018tQF3M3r9Eupg1A4SfKVQe
Adds test_run_stops_a_program_that_eats_memory: a program that doubles a 16-byte string 40 times is stopped by the fallback runner's RLIMIT_AS cap on the locked velaris-lang 2.57.0 and reports the limit hit. Skipped on Windows, where the address-space limit is not available. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018tQF3M3r9Eupg1A4SfKVQe
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Inline comments:
In `@lib/crewai-tools/tests/tools/test_velaris_tool.py`:
- Line 104: Update the assertion in the Velaris tool memory-program test to
verify that the exact computed value 17592186044416 is absent from out, rather
than checking for lines beginning with 16.
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RLIMIT_AS is not reliably honoured on macOS, so the memory-cap test could flake there. The test now runs only on Linux. The subprocess fallback still sets the limit on every POSIX platform, since setting it is harmless where it is ignored. The docstrings and README now state the cap as enforced on Linux, best-effort on macOS, not applied on Windows. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018tQF3M3r9Eupg1A4SfKVQe
The memory test checked for a line starting with "16", but 16 * 2**40 is 17592186044416, which starts with 17. A run that printed the computed length could pass. The assertion now checks that exact value is absent from the output. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018tQF3M3r9Eupg1A4SfKVQe
The timeout test asserted only that some STOPPED line appeared, which an out-of-memory stop could also satisfy. It now checks the timeout message "ran longer than 2". Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018tQF3M3r9Eupg1A4SfKVQe
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Add Velaris tools: sandboxed execution of agent-written code
The problem
When an agent writes code, the crew has to run it somewhere. Today the
choices are a subprocess with the crew's full permissions, or a
container. Neither tells you what the code will do before it runs,
and neither lets the crew's author say "this agent may print and
nothing else."
What this adds
Two tools (plus a third that returns the language reference):
VelarisAuditTool— reports what a program can touch (io, fs, net,clock, rand, ffi), what each function promises, and whether those
promises were proven before running. Returns versioned JSON.
VelarisRunTool(allow=["io"])— runs the program with an effectbudget the crew's author sets. Effects outside it are refused while
the program runs, whatever the source claims, and a refusal cannot
be caught by the program.
Velaris is a small language built for this: a function's signature
declares its effects and its promises, and a theorem prover checks the
promises before execution. A model learns it from a ~2,300-word card
(the third tool returns it), so an agent can write it without prior
training.
Tests
Seven tests, all runnable in CI with
pip install velaris-lang:the audit names effects, the run refuses
fswhen onlyioisallowed (and the program's fail branch does not run), permits it when
granted, returns output, defaults to
io-only, has the default limitsset, and stops a program that never ends.
Limits
VelarisRunToolruns the program in a separate, killable process bounded bytimeout(default 30 s) andmax_memory_mb(default 512). A breach stops theprogram and the tool reports
STOPPEDwith the limit hit (E610 for time,E611 for memory). The limits are enforced on every supported compiler version:
on velaris-lang 2.59.0 and newer by
velaris.runitself, and on older versions(including the 2.57.0 this repository's
exclude-newerlock policy currentlyresolves) by the tool running the compiler as its own killable subprocess with
the same timeout and, on POSIX, an
RLIMIT_ASmemory cap. The memory cap isenforced on Linux and macOS only; the timeout is enforced everywhere.
Not a security boundary.
allow=["ffi"]grants everything Python cando. It is a guard for the ordinary case of running a script a model
wrote. The tool's docstring and README say so.
Links
holds through the API:
EMBEDDING.mdandcheck_library.pythereMaintenance
Velaris has been through 71 tagged releases on GitHub (48 published to PyPI) with adversarial review from three model families, and will be maintained.
Related: #6180 (documentation for production code execution in crews, which asks for sandboxing patterns for agent-generated code).
Disclosure
This PR was authored with an AI coding agent (Claude Code) under the direction of the Velaris maintainer. The
llm-generatedlabel the contributing guide asks for could not be applied from a fork; maintainers, please add it.