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add-managed-cli

Add or upgrade a curated, immutable managed CLI for Sim Function sandboxes, including client-safe catalog metadata, a pinned server-only installation recipe, checksum and executable verification, provider compatibility, PATH propagation, content-addressed image identity, and tests. Use when adding a CLI to the Sandbox managed-CLI selector or changing an existing managed CLI version or recipe.

73

Quality

92%

Does it follow best practices?

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SecuritybySnyk

Passed

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SKILL.md
Quality
Evals
Security

Quality

Content

88%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

A well-engineered, highly actionable skill body with a clear sequenced workflow, explicit validation gates, and a completion checklist. The only slack is mild wordiness in a few policy sentences and the absence of any bundle split despite the length.

DimensionReasoningScore

Conciseness

The body is dense, imperative, and free of concept re-teaching — every section carries repo-specific policy Claude cannot infer. A few passages run wordier than needed (e.g., the retirement-field paragraph and the colliding-versions sentence), so it is efficient with minor trims rather than fully lean.

4 / 5

Actionability

Exact file paths, registry keys (SANDBOX_CLI_TOOL_IDS, SANDBOX_CLI_TOOLS), helper names (defineBinaryRecipe, defineTarGzipRecipe), the ID format "<tool>@<upstream-version>-r<recipe-revision>", and copy-paste-ready bun/biome validation commands make the guidance fully executable for this instruction-only skill.

5 / 5

Workflow Clarity

A clear Read First -> steps 1-6 -> Required Validation -> Completion Checklist sequence with explicit validation commands, upgrade regression requirements, and honest disclosure when live provider testing is skipped. The checklist and validation blocks provide the checkpoints and feedback structure the anchor-5 example requires.

5 / 5

Progressive Disclosure

No bundle files exist, and the single body is well organized with clear section headers plus read-first pointers to live source files that serve as one-level-deep references. It sits just above the simple-skill case (well over 50 lines of dense policy that could arguably split recipe-helper details into a reference), landing at good structure with minor organization gaps.

4 / 5

Total

18

/

20

Passed

Description

92%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

A strong description that clearly states both the full set of concrete capabilities and the exact triggering scenarios in third person. Only minor room to grow in natural keyword variations.

DimensionReasoningScore

Specificity

"Add or upgrade a curated, immutable managed CLI... including client-safe catalog metadata, a pinned server-only installation recipe, checksum and executable verification, provider compatibility, PATH propagation, content-addressed image identity, and tests" lists many specific concrete actions with comprehensive coverage. Not 4: there are no minor gaps in the capability list.

5 / 5

Completeness

The first sentence explicitly answers "what" with a full capability list, and "Use when adding a CLI to the Sandbox managed-CLI selector or changing an existing managed CLI version or recipe" explicitly answers "when" with concrete trigger phrases. Matches the anchor-5 pattern of stating both what and when.

5 / 5

Trigger Term Quality

"Use when adding a CLI to the Sandbox managed-CLI selector or changing an existing managed CLI version or recipe" provides good natural keywords (adding a CLI, changing a version or recipe). A few natural variations are missing (e.g., "install a CLI/tool" or naming example CLIs), so it falls just short of comprehensive.

4 / 5

Distinctiveness Conflict Risk

"Sim Function sandboxes" and "Sandbox managed-CLI selector" define a clear niche with distinct triggers, making conflict with other skills minimal. Not 4: the trigger terms are unique to this specific registry surface, not merely mostly distinct.

5 / 5

Total

19

/

20

Passed

Validation

100%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository

simstudioai/sim

Path

.agents/skills/add-managed-cli/SKILL.md

Reviewed

Table of Contents

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