Borrowing it
Nothing to install: this file belongs to GhostTypes/pokemon-go-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/GhostTypes/pokemon-go-mcp/main/.claude/skills/fastmcp-v3-migration/SKILL.mdgit clone --depth 1 https://github.com/GhostTypes/pokemon-go-mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/ghosttypes/pokemon-go-mcp/fastmcp-v3-migration)<a href="https://agentmods.dev/skills/ghosttypes/pokemon-go-mcp/fastmcp-v3-migration"><img src="https://agentmods.dev/badge/skills/ghosttypes/pokemon-go-mcp/fastmcp-v3-migration/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/ghosttypes/pokemon-go-mcp/fastmcp-v3-migration"><img src="https://agentmods.dev/badge/skills/ghosttypes/pokemon-go-mcp/fastmcp-v3-migration.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high System Prompt Leakage · line 130 Skill contains instructions that could directly expose system prompts, internal rules, or hidden instructions to users or external parties.Fix: Remove any instructions that reveal, print, or output system prompts or internal rules. System instructions should never be exposed to end users.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00109 | $0.02872 |
| Opus 5 | $0.00055 | $0.01436 |
| Sonnet 5 | $0.00022 | $0.00574 |
| Haiku 4.5 | $0.00011 | $0.00287 |
Grade A, and why
fastmcp-v3-migration scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 493 lines — stays where its author put it; the contents beside it link to each section on GitHub.
FastMCP v3 Migration Skill
Migrate FastMCP MCP servers from v2.x to v3.0 with zero breaking changes or regressions.
Critical: User Confirmation Protocol
Use AskUserQuestionTool to confirm before any destructive or ambiguous operation:
- Before modifying any file, confirm the migration scope
- Before changing imports, confirm which v2 patterns are in use
- Before removing deprecated code, confirm replacement approach
- Before testing, confirm the test strategy
- After migration, confirm all features work as expected
Quick Start Migration
Most servers need only one change:
# BEFORE (v2.x)
from mcp.server.fastmcp import FastMCP
# AFTER (v3.0)
from fastmcp import FastMCP
If that's the only change needed, the migration is complete. Run tests to verify.
Migration Workflow
Phase 1: Assessment
- Identify FastMCP version: Check
pip show fastmcporrequirements.txt - Scan for breaking patterns: See Breaking Changes Reference
- Use AskUserQuestionTool: Confirm migration scope with user
- Create backup: Ensure git commit or file backup exists
Phase 2: Core Migration
Apply changes in order of priority:
- Update imports (required)
- Fix breaking changes (if any patterns detected)
- Update deprecated patterns (optional but recommended)
- Adopt new v3 features (optional enhancement)
Phase 3: Validation
- Run existing tests
- Test with FastMCP Client
- Verify with MCP Inspector:
fastmcp dev server.py - Use AskUserQuestionTool: Confirm migration success with user
Breaking Changes Reference
Import Change (Required)
# v2.x
from mcp.server.fastmcp import FastMCP
# v3.0
from fastmcp import FastMCP
WSTransport Removed
# v2.x (removed)
from fastmcp.client.transports import WSTransport
# v3.0 replacement
from fastmcp.client.transports import StreamableHttpTransport
Auth Provider Environment Variables
Auth providers no longer auto-load from environment:
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 493 lines · 109 tokens per session scan A c2272cabde1a
fastmcp-v3-migration is a skill published in the GitHub repository GhostTypes/pokemon-go-mcp (7 stars, last pushed today), licensed MIT. It adds 109 tokens to every session and 2,872 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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