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deprecation-and-migration

Manages deprecation and migration. Use when removing old systems, APIs, or features. Use when migrating users from one implementation to another. Use when deciding whether to maintain or sunset existing code.

58

Quality

66%

Does it follow best practices?

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SecuritybySnyk

Passed

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Fix and improve this skill with Tessl

tessl review fix ./skills/deprecation-and-migration/SKILL.md
SKILL.md
Quality
Evals
Security

Quality

Content

63%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.

The body is actionable and well-sequenced with concrete code, decision frameworks, and verification checklists covering destructive and batch operations. Its weaknesses are philosophical padding that Claude mostly already knows and a monolithic structure that doesn't progressively disclose detail into reference files.

Suggestions

Trim the Overview and Core Principles sections to essentials — remove "Code is a liability"-style restatements and the "Most engineering organizations…" framing line.

Move the detailed Migration Patterns and the Common Rationalizations table into a reference file (e.g. references/patterns.md), keeping SKILL.md a concise overview with clearly signaled links.

Add an explicit validate→fix→retry loop to Step 3 of the Migration Process (e.g., "If verification fails, fix and re-verify before removing old-system references").

DimensionReasoningScore

Conciseness

Mostly efficient with strong concrete material, but the Overview and Core Principles sections restate concepts Claude already knows ("Code is a liability…", "Most engineering organizations are good at building things…") and could be trimmed.

3 / 5

Actionability

It provides mostly executable guidance — TypeScript adapter and feature-flag code, an expand/contract worked example, and concrete commands like `npx migrate-check` and `CREATE INDEX CONCURRENTLY` — with only minor gaps in the decision-framework portions.

4 / 5

Workflow Clarity

The Migration Process is sequenced as Steps 1–4 with verify/confirm checkpoints, and verification checklists plus a tested down-path exist, but explicit validate→fix→retry feedback loops are only implied rather than spelled out.

4 / 5

Progressive Disclosure

The body is well-sectioned but monolithic at ~247 lines with no bundle files and all content inlined; the detailed Migration Patterns and Rationalizations table are candidates for one-level-deep reference files.

3 / 5

Total

14

/

20

Passed

Description

70%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.

The description clearly answers what the skill does and when to use it, with strong natural trigger phrases and a distinct niche. Its main weakness is the generic "Manages" verb, which undersells the concrete actions the skill performs.

Suggestions

Replace the generic verb "Manages" with 2-3 concrete actions (e.g., "Plans, announces, and executes deprecations and migrations") to raise specificity.

Consolidate the three "Use when…" clauses into a tighter single trigger sentence to reduce repetition without losing trigger coverage.

DimensionReasoningScore

Specificity

"Manages deprecation and migration" names the domain and two actions, but "manages" is a generic verb and the coverage is not comprehensive, matching the domain-plus-1-2-actions anchor rather than the multi-action anchor above.

3 / 5

Completeness

It states a clear "what" ("Manages deprecation and migration") and an explicit, repeated "when" via three "Use when…" clauses, but the "what" is generic enough to keep it just below the top anchor.

4 / 5

Trigger Term Quality

Natural user phrases are present ("removing old systems, APIs, or features", "migrating users", "sunset", "maintain") with good synonym coverage, though it stops short of the fully comprehensive anchor.

4 / 5

Distinctiveness Conflict Risk

The deprecation/migration niche with sunset and migration triggers is mostly distinct, with only minor overlap risk against a broad refactoring skill.

4 / 5

Total

15

/

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.

Validation16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository
addyosmani/agent-skills
Reviewed

Table of Contents

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