MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
Migrate prompts and code from Claude Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5.
Install Opus 4 5 Migration
$ npx skills add gotalab/skillport --skill opus-4-5-migration -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install gotalab/skillport opus-4-5-migration --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/gotalab/skillport.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.skills/experimental/opus-4-5-migration .claude/skills/opus-4-5-migration && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "opus-4-5-migration" agent skill from https://github.com/gotalab/skillport/tree/main/.skills/experimental/opus-4-5-migration into .claude/skills/opus-4-5-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "opus-4-5-migration", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/gotalab/skillport/tree/main/.skills/experimental/opus-4-5-migrationType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add gotalab/skillport --skill opus-4-5-migration -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install gotalab/skillport opus-4-5-migration --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/gotalab/skillport.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.skills/experimental/opus-4-5-migration .agents/skills/opus-4-5-migration && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "opus-4-5-migration" agent skill from https://github.com/gotalab/skillport/tree/main/.skills/experimental/opus-4-5-migration into .agents/skills/opus-4-5-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "opus-4-5-migration", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add gotalab/skillport --skill opus-4-5-migration -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install gotalab/skillport opus-4-5-migration --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/gotalab/skillport.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.skills/experimental/opus-4-5-migration .cursor/skills/opus-4-5-migration && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "opus-4-5-migration" agent skill from https://github.com/gotalab/skillport/tree/main/.skills/experimental/opus-4-5-migration into .cursor/skills/opus-4-5-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "opus-4-5-migration", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/gotalab/skillport.git --path .skills/experimental/opus-4-5-migration--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add gotalab/skillport --skill opus-4-5-migration -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install gotalab/skillport opus-4-5-migration --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/gotalab/skillport.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.skills/experimental/opus-4-5-migration .gemini/skills/opus-4-5-migration && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "opus-4-5-migration" agent skill from https://github.com/gotalab/skillport/tree/main/.skills/experimental/opus-4-5-migration into .gemini/skills/opus-4-5-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "opus-4-5-migration", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install gotalab/skillport opus-4-5-migrationInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add gotalab/skillport --skill opus-4-5-migration -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/gotalab/skillport.git skills-src && mkdir -p .github/skills && cp -r skills-src/.skills/experimental/opus-4-5-migration .github/skills/opus-4-5-migration && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "opus-4-5-migration" agent skill from https://github.com/gotalab/skillport/tree/main/.skills/experimental/opus-4-5-migration into .github/skills/opus-4-5-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "opus-4-5-migration", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add gotalab/skillport --skill opus-4-5-migration -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install gotalab/skillport opus-4-5-migration --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/gotalab/skillport.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.skills/experimental/opus-4-5-migration .opencode/skills/opus-4-5-migration && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "opus-4-5-migration" agent skill from https://github.com/gotalab/skillport/tree/main/.skills/experimental/opus-4-5-migration into .opencode/skills/opus-4-5-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "opus-4-5-migration", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
opus-4-5-migration- GitHub stars
- 413
- Used in
- 4 other repos
- Token cost
- ~1.2k tokens
- SKILL.md length
- 520 words
- Files
- 3 (incl. references)
- Skills in repo
- 3
- Repo updated
- First seen
- Licence
- MIT
At a glance
Migrate prompts and code from Claude Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5.
- Works in 5 steps: Tool Overtriggering → Over-Engineering Prevention → Code Exploration → …
- The user wants to update their codebase
- SKILL.md covers Migration Workflow, Model String Updates, Prompt Adjustments and Reference
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Opus 4 5 Migration is an agent skill from gotalab/skillport. 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.
Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including reference files (for example `references/effort.md` and `references/prompt-snippets.md`).
It sits in Agent Workflows. It works with Model Context Protocol. The repository describes itself as: Bring Agent Skills to Any AI Agent and Coding Agent — via CLI or MCP. Manage once, serve anywhere. The licence is MIT.
When your agent uses it
- The user wants to update their codebase
- API calls to use Opus 4.5
Example prompts
- “/opus-4-5-migration”
Requirements
- Python 3
Workflow steps
5 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 51334ae. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are python).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Opus 4 5 Migration loads about 1.2k tokens when it runs, and up to ~3.2k if it reads all its reference files. Until then it costs about 79 tokens; SKILL.md has 520 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from gotalab/skillport at commit 51334ae, republished under its MIT licence (© gotalab). 520 words, ~1,211 tokens.
Download SKILL.mdSave it as
.claude/skills/opus-4-5-migration/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.- name
- opus-4-5-migration
- description
- 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.
Opus 4.5 Migration Guide
One-shot migration from Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5.
Migration Workflow
- Search codebase for model strings and API calls
- Update model strings to Opus 4.5 (see platform-specific strings below)
- Remove unsupported beta headers
- Add effort parameter set to
"high"(seereferences/effort.md) - Summarize all changes made
- Tell the user: "If you encounter any issues with Opus 4.5, let me know and I can help adjust your prompts."
Model String Updates
Identify which platform the codebase uses, then replace model strings accordingly.
Unsupported Beta Headers
Remove the context-1m-2025-08-07 beta header if present—it is not yet supported with Opus 4.5. Leave a comment noting this:
# Note: 1M context beta (context-1m-2025-08-07) not yet supported with Opus 4.5Target Model Strings (Opus 4.5)
| Platform | Opus 4.5 Model String |
|---|---|
| Anthropic API (1P) | claude-opus-4-5-20251101 |
| AWS Bedrock | anthropic.claude-opus-4-5-20251101-v1:0 |
| Google Vertex AI | claude-opus-4-5@20251101 |
| Azure AI Foundry | claude-opus-4-5-20251101 |
Source Model Strings to Replace
| Source Model | Anthropic API (1P) | AWS Bedrock | Google Vertex AI |
|---|---|---|---|
| Sonnet 4.0 | claude-sonnet-4-20250514 | anthropic.claude-sonnet-4-20250514-v1:0 | claude-sonnet-4@20250514 |
| Sonnet 4.5 | claude-sonnet-4-5-20250929 | anthropic.claude-sonnet-4-5-20250929-v1:0 | claude-sonnet-4-5@20250929 |
| Opus 4.1 | claude-opus-4-1-20250422 | anthropic.claude-opus-4-1-20250422-v1:0 | claude-opus-4-1@20250422 |
Do NOT migrate: Any Haiku models (e.g., claude-haiku-4-5-20251001).
Prompt Adjustments
Opus 4.5 has known behavioral differences from previous models. Only apply these fixes if the user explicitly requests them or reports a specific issue. By default, just update model strings.
Integration guidelines: When adding snippets, don't just append them to prompts. Integrate them thoughtfully:
- Use XML tags (e.g.,
<code_guidelines>,<tool_usage>) to organize additions - Match the style and structure of the existing prompt
- Place snippets in logical locations (e.g., coding guidelines near other coding instructions)
- If the prompt already uses XML tags, add new content within appropriate existing tags or create consistent new ones
1. Tool Overtriggering
Opus 4.5 is more responsive to system prompts. Aggressive language that prevented undertriggering on previous models may now cause overtriggering.
Apply if: User reports tools being called too frequently or unnecessarily.
Find and soften:
CRITICAL:→ remove or softenYou MUST...→You should...ALWAYS do X→Do XNEVER skip...→Don't skip...REQUIRED→ remove or soften
Only apply to tool-triggering instructions. Leave other uses of emphasis alone.
Show full SKILL.md (177 more words)Show less
2. Over-Engineering Prevention
Opus 4.5 tends to create extra files, add unnecessary abstractions, or build unrequested flexibility.
Apply if: User reports unwanted files, excessive abstraction, or unrequested features. Add the snippet from references/prompt-snippets.md.
3. Code Exploration
Opus 4.5 can be overly conservative about exploring code, proposing solutions without reading files.
Apply if: User reports the model proposing fixes without inspecting relevant code. Add the snippet from references/prompt-snippets.md.
4. Frontend Design
Apply if: User requests improved frontend design quality or reports generic-looking outputs.
Add the frontend aesthetics snippet from references/prompt-snippets.md.
5. Thinking Sensitivity
When extended thinking is not enabled (the default), Opus 4.5 is particularly sensitive to the word "think" and its variants. Extended thinking is enabled only if the API request contains a thinking parameter.
Apply if: User reports issues related to "thinking" while extended thinking is not enabled (no thinking parameter in request).
Replace "think" with alternatives like "consider," "believe," or "evaluate."
Reference
See references/prompt-snippets.md for the full text of each snippet to add.
See references/effort.md for configuring the effort parameter (only if user requests it).
© gotalab, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 2 other files (references) in .skills/experimental/opus-4-5-migration of gotalab/skillport.
- SKILL.md
- references/effort.md
- references/prompt-snippets.md
Open the folder on GitHubat commit 51334ae
Used in 4 other repositories
We found 15 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 4 other GitHub owners. This page covers the copy in gotalab/skillport, which our catalogue first saw on October 7, 2026.
- LING71671/Open-ClaudeCodeplugins/claude-opus-4-5-migration/skills/claude-opus-4-5-migration
- davila7/claude-code-templatescli-tool/components/skills/development/claude-opus-4-5-migration
- Microck/ordinary-claude-skillsskills_all/claude-opus-4-5-migrationskills_categorized/llm-ai/claude-opus-4-5-migration+9 more
- aiskillstore/marketplaceskills/claude-opus-4-5-migrationskills/davila7/claude-opus-4-5-migration
Compare with similar skills
Opus 4 5 Migration next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Opus 4 5 Migration this skillgotalab/skillport | 413 | 4 repos | ~1.2k | Automated safety check: Pass | MIT | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| MCP Server BuildershareAI-lab/learn-claude-code | 78k | 4 repos | ~1.2k | Automated safety check: Pass | MIT | |
| MCP Integration for Pluginsanthropics/claude-plugins-official | 38k | 11 repos | ~3.1k | Automated safety check: Pass | Apache-2.0 | |
| MemPalace Memory SearchMemPalace/mempalace | 59k | — | ~1.4k | Automated safety check: Pass | MIT | |
| Crush Configurationcharmbracelet/crush | 29k | — | ~3.7k | Automated safety check: Pass | Custom licence |
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shareAI-lab/learn-claude-code
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- Official
MCP Integration for Plugins
anthropics/claude-plugins-official
Explains how to bundle Model Context Protocol servers in a Claude Code plugin, covering config files, stdio, SSE, HTTP and WebSocket server types, and authentication.
MemPalace Memory Search
MemPalace/mempalace
Mines project files and conversation exports into a local, searchable memory palace and recalls past work by semantic search through the mempalace CLI.
Crush Configuration
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Explains how to configure the Crush coding agent with crushrc or crush.json, covering providers, models, LSPs, MCP servers, hooks, permissions and config precedence.
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Related
Works with
Categories
Questions about Opus 4 5 Migration
What does Opus 4 5 Migration do?
Migrate prompts and code from Claude Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5. Opus 4 5 Migration is an agent skill from gotalab/skillport.5.
When should I use Opus 4 5 Migration?
Opus 4 5 Migration fits situations like: the user wants to update their codebase; API calls to use Opus 4.5.
How do I install Opus 4 5 Migration in Claude Code?
Run `npx skills add gotalab/skillport --skill opus-4-5-migration -a claude-code`. Or copy the skill folder (.skills/experimental/opus-4-5-migration in gotalab/skillport) into .claude/skills/opus-4-5-migration in your project. Claude Code loads it when a task matches its description.
How do I install Opus 4 5 Migration in Codex?
Run `npx skills add gotalab/skillport --skill opus-4-5-migration -a codex`. Or copy the skill folder (.skills/experimental/opus-4-5-migration in gotalab/skillport) into .agents/skills/opus-4-5-migration in your project. Codex loads it when a task matches its description.
Can I use Opus 4 5 Migration in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add gotalab/skillport --skill opus-4-5-migration -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/opus-4-5-migration, .gemini/skills/opus-4-5-migration, .github/skills/opus-4-5-migration and .opencode/skills/opus-4-5-migration in your project.
What does Opus 4 5 Migration need to run?
SKILL.md names no scripts, command-line tools or credentials: Opus 4 5 Migration is instructions for the agent only. Our summary lists: Python 3.
Does Opus 4 5 Migration access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Opus 4 5 Migration safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Opus 4 5 Migration use?
Opus 4 5 Migration is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Opus 4 5 Migration use?
About 1.2k tokens (SKILL.md is roughly 4.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 2k tokens, read only when the agent opens those files.
What are the alternatives to Opus 4 5 Migration?
Skills that share tags, products or a category with Opus 4 5 Migration: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and MemPalace Memory Search (MemPalace/mempalace, 59k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Opus 4 5 Migration?
gotalab (a GitHub user) maintains it in gotalab/skillport, which has 413 GitHub stars. The repository holds 3 skills in this directory. The repository was last updated on June 24, 2026.
Source: gotalab/skillport on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.