skill

claude-opus-4-5-migration — Claude Code skill: move to Opus 4.5

Q: How do I install claude-opus-4-5-migration in Claude Code?

Run `npx claude-code-templates@latest --skill development/claude-opus-4-5-migration`. Or use `npx skills add davila7/claude-code-templates --skill claude-opus-4-5-migration -a claude-code`. The skill file itself sits at `~/.claude/skills/claude-opus-4-5-migration/SKILL.md`.

A skill that scans your codebase for model strings and API calls and switches them to Opus 4.5. Useful when a project needs the newer model.

Install into Claude Code · claude-code-templates All methods and platforms ↓

npx claude-code-templates@latest --skill development/claude-opus-4-5-migration

Open on GitHub

What claude-opus-4-5-migration does

The skill walks the repository looking for model strings and API calls, then swaps in the Opus 4.5 identifier for whichever platform you use: claude-opus-4-5-20251101 on the Anthropic API, anthropic.claude-opus-4-5-20251101-v1:0 on AWS Bedrock, claude-opus-4-5@20251101 on Google Vertex AI, claude-opus-4-5-20251101 on Azure AI Foundry. It also strips the context-1m-2025-08-07 beta header, which Opus 4.5 does not accept yet, and leaves a comment in its place.

Model strings are the only thing changed by default. Prompt rewrites happen only when you ask for them or describe a specific problem. In that case the skill pulls ready snippets from references/prompt-snippets.md and folds them into the prompt with XML tags instead of tacking them on at the end. Effort parameter setup lives in references/effort.md.

Migration runs one way: Haiku models stay untouched, and the accepted sources are Claude, Claude and Opus 4.1. At the end the skill lists everything it changed.

What it helps with

locate every model string and API call across a repository
swap Claude, Claude and Opus 4.1 identifiers for Opus 4.5
drop the context-1m-2025-08-07 beta header that Opus 4.5 rejects
soften forceful prompt wording that makes tools fire too often
fold new snippets into a prompt with XML tags without breaking its structure

Example prompts for the agent

Move this project to Opus 4.5: find the model strings and API calls and update them
The model calls tools too often now — soften the wording in my prompts
Add the snippet against extra files and abstractions from references/prompt-snippets.md to my prompt

How to install claude-opus-4-5-migration

1claude-code-templates

npx claude-code-templates@latest --skill development/claude-opus-4-5-migration

2Skills CLI (Vercel)

npx skills add davila7/claude-code-templates --skill claude-opus-4-5-migration -a claude-code

3Manually: put the files in place

~/.claude/skills/claude-opus-4-5-migration/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/claude-opus-4-5-migration/

Manually: put the files in place

.agents/skills/claude-opus-4-5-migration/SKILL.md

For all projects use ~/.agents/skills/

Manually: put the files in place

.cursor/skills/claude-opus-4-5-migration/SKILL.md

Cursor also reads .agents/skills/ and .claude/skills/

1GitHub CLI

gh skill install davila7/claude-code-templates claude-opus-4-5-migration

2Manually: put the files in place

.github/skills/claude-opus-4-5-migration/SKILL.md

Platform CLI

gemini skills install https://github.com/davila7/claude-code-templates --path cli-tool/components/skills/development/claude-opus-4-5-migration

Manually: put the files in place

.devin/skills/claude-opus-4-5-migration/SKILL.md

The legacy .windsurf/skills/ path still works

Step by step, with commands for each platform: How to install skills in Claude Code: five ways

Questions about claude-opus-4-5-migration

How do I install claude-opus-4-5-migration in Claude Code?

Run npx claude-code-templates@latest --skill development/claude-opus-4-5-migration. Or use npx skills add davila7/claude-code-templates --skill claude-opus-4-5-migration -a claude-code. The skill file itself sits at ~/.claude/skills/claude-opus-4-5-migration/SKILL.md.

What does claude-opus-4-5-migration do?

It searches your codebase for model strings and API calls, replaces them with the Opus 4.5 identifier for your platform, and removes the unsupported beta header. Prompt edits happen only on request.

Can it migrate a project off Haiku?

No. Haiku is out of scope; the skill covers Claude, Claude and Opus 4.1.

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