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playground

Author, edit, or iterate on prompts in the Phoenix prompt playground, including running experiments over a dataset. Load before any playground `ui.*` operation call, including single-shot prompt rewrites.

70

Quality

88%

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SKILL.md
Quality
Evals
Security

Quality

Content

85%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 highly actionable, well-validated operational skill: exact operation names, executable JS/JSON idioms, and explicit checkpoints throughout. Its main weakness is structure — half the file is inlined example-payload data that belongs in a references/ file, plus minor duplication between the workflow and gotchas sections.

Suggestions

Move the few-shot ui.playground.prompt.tools.write example payloads (the '### Few-shot examples' section, ~170 lines) into a references/ file such as references/tools-write-examples.md, keeping only the read-then-write revision idiom and a one-line pointer inline.

Deduplicate rules stated in both the workflow steps and the 'Things to avoid' section (raw-tool write restrictions, forced tool-choice reset, instance.add vs clone semantics) — state each once and cross-reference it from the other location.

Trim explanations of known concepts, e.g. 'LLM outputs are nondeterministic; repetitions build confidence by checking the same task across multiple runs' can be reduced to the operational rule about when to call ui.playground.repetitions.set.

DimensionReasoningScore

Conciseness

The body is dense and operational with almost no padding, but a few sentences explain concepts Claude already knows ("LLM outputs are nondeterministic; repetitions build confidence...") and several rules (instance.add vs clone, raw-tool write restrictions, forced tool-choice reset) are stated twice across the workflow and 'Things to avoid' sections. Minor trims are possible, matching the 'efficient; minor instances of over-explanation' anchor rather than the every-token-earns-its-place anchor.

4 / 5

Actionability

Every workflow names exact operations (ui.playground.prompt.tools.read/write, ui.playground.run, etc.) with copy-paste-ready idioms including error checks (if (!run.ok) return run;), complete JSON example payloads for tools.write batches, a full phoenix-gql query for experiment results, and explicit defaults (snake_case parameter names, object/properties/required schema shape). This matches the fully-executable, common-cases-covered anchor.

5 / 5

Workflow Clarity

Three numbered workflows are clearly sequenced with explicit validation gates (check run.ok, trust summaries only when job.status is COMPLETED or runCount == expectedRunCount), feedback loops (read revision before write, re-read between writes, edit-run-inspect-repeat until useful), and a gotchas checklist. The batch tools.write operation includes validation (fresh expectedRevision, all-or-nothing semantics with explained errors), so the batch-operation cap does not apply; this matches the anchor with explicit validation steps, error-recovery loops, and checklists.

5 / 5

Progressive Disclosure

Sections are well organized (three workflows, few-shot examples, things to avoid) but the skill is entirely monolithic: roughly 170 lines of few-shot tools.write JSON examples are inlined in SKILL.md with no bundle files to absorb that detail. This matches the 'content that should be separate is inline' anchor rather than anchor 4, where most content is appropriately placed in separate files.

3 / 5

Total

17

/

20

Passed

Description

87%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: concrete third-person actions, an explicit and specific load trigger that includes the easy-to-miss single-shot rewrite case, and a distinct niche in the Phoenix playground. Only minor improvements available in keyword synonyms and covering the tool-authoring workflow.

DimensionReasoningScore

Specificity

"Author, edit, or iterate on prompts in the Phoenix prompt playground, including running experiments over a dataset" lists several specific concrete actions in a named domain, but omits the function-tool authoring and prompt save/compare workflows that the body treats as core — minor gaps in coverage, matching anchor 4 rather than the comprehensive anchor 5 and clearly above the 1-2-actions anchor 3.

4 / 5

Completeness

It explicitly answers both what ("Author, edit, or iterate on prompts... including running experiments over a dataset") and when ("Load before any playground `ui.*` operation call, including single-shot prompt rewrites") with concrete trigger phrases, matching the anchor-5 example's structure. Explicit trigger guidance is present, so the missing-'Use when' cap at 3 does not apply.

5 / 5

Trigger Term Quality

Good natural keyword coverage — "prompts", "prompt playground", "experiments", "dataset", "single-shot prompt rewrites" — but a few natural terms users would say are missing ("test", "tune", "evaluate", "compare" prompts). Matches the 'good keyword coverage; a few natural terms missing' anchor.

4 / 5

Distinctiveness Conflict Risk

"Phoenix prompt playground" pins a clear niche with distinct triggers (playground ui.* operations, prompt rewrites), and the when-clause scopes loading to playground operations specifically — minimal conflict risk with other prompt- or experiment-related skills, matching the clear-niche anchor 5.

5 / 5

Total

18

/

20

Passed

Validation

93%

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

Validation — 15 / 16 Passed

Validation for skill structure

CriteriaDescriptionResult

frontmatter_unknown_keys

Unknown frontmatter key(s) found; consider removing or moving to metadata

Warning

Total

15

/

16

Passed

Repository

Arize-ai/phoenix

Path

src/phoenix/server/agents/prompts/skills/playground/SKILL.md

Reviewed

Table of Contents

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