CtrlK
BlogDocsLog inGet started
Tessl Logo

claude-opus-4-5-migration

Migrate prompts and code from Claude Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5. Use when the user wants to update their codebase, prompts, or API calls to use Opus 4.5. Handles model string updates and prompt adjustments for known Opus 4.5 behavioral differences. Does NOT migrate Haiku 4.5.

93

1.75x
Quality

93%

Does it follow best practices?

Impact

91%

1.75x

Average score across 6 eval scenarios

SecuritybySnyk

Passed

No findings from the security scan

SKILL.md
Quality
Evals
Security

Quality

Content

87%

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

The body is concise, highly actionable, and well-structured with real one-level-deep references. Its one weakness is the migration workflow: a batch operation without an explicit validation feedback loop.

Suggestions

Add an explicit validation checkpoint after the model-string update — e.g., re-search the codebase to confirm no old source strings remain before summarizing.

Include a verify step such as running an API call with the new Opus 4.5 string to confirm it succeeds, turning the summary into a validate->fix->retry loop for any failures or leftover strings.

Make step 5 a real checklist (old strings gone, beta headers removed, effort parameter set, API call verified) rather than just a prose summary.

DimensionReasoningScore

Conciseness

Lean, table-driven content with no padding about basic concepts; the behavioral notes are Opus-4.5-specific knowledge Claude would not already have, so they earn their place.

3 / 3

Actionability

Copy-paste-ready model-string tables, an exact beta header to remove with a concrete comment, and concrete before/after prompt rewrites provide fully executable guidance.

3 / 3

Workflow Clarity

The six-step migration sequence is clearly ordered, but it is a batch operation lacking an explicit validate->fix->retry checkpoint beyond a soft 'Summarize all changes made' step.

2 / 3

Progressive Disclosure

The body is an overview that points to references/effort.md and references/prompt-snippets.md — both real, one level deep, clearly signaled — keeping snippet detail out of the main file.

3 / 3

Total

11

/

12

Passed

Description

100%

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 is specific, uses natural trigger language, answers both what and when explicitly, and carves out a clearly distinct niche with an explicit exclusion. It reads cleanly in third person without padding.

DimensionReasoningScore

Specificity

Lists multiple concrete actions — 'Migrate prompts and code', 'model string updates', 'prompt adjustments' — with named source/target models, matching the multiple-specific-actions anchor.

3 / 3

Completeness

Explicitly answers both what ('Migrate... Handles model string updates and prompt adjustments') and when ('Use when the user wants to update...'), mirroring the top anchor example.

3 / 3

Trigger Term Quality

'Use when the user wants to update their codebase, prompts, or API calls to use Opus 4.5' uses natural phrasing a user would actually say, giving good coverage of trigger terms.

3 / 3

Distinctiveness Conflict Risk

A narrow niche (specific source models to Opus 4.5) with an explicit exclusion ('Does NOT migrate Haiku 4.5') makes conflict with other skills unlikely.

3 / 3

Total

12

/

12

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
anthropics/claude-code
Reviewed

Table of Contents

Is this your skill?

If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.