General
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readOnlyHint: True
# Tool does not modify environment
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General
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param1: str = Field(...
description=First parameter description (e.g.
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General
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validate_assignment=True
# Validate on assignment
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General
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param2: Optional[int] = Field(default=None
description=Optional integer parameter with constraints
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General
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from pydantic import BaseModel
Field
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General
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Use snake_case for tool names (e.g.
search_users
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General
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str_strip_whitespace=True
# Auto-strip whitespace from strings
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General
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**For complete SDK documentation
use WebFetch to load:**
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General
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- **Examples**: `github_mcp`
`jira_mcp`
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Coding & Debugging
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The official MCP Python SDK provides FastMCP
a high-level framework for building MCP servers. It provides:
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General
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from typing import Optional
List
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General
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@mcp.tool(name=tool_name
annotations={...})
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General
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from pydantic import BaseModel
Field
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General
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- [ ] Error handling uses proper type guards (e.g.
`axios.isAxiosError`
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Coding & Debugging
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This document provides Python-specific best practices and examples for implementing MCP servers using the MCP Python SDK. It covers server setup
tool registration patterns
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General
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- [ ] Error messages are clear
actionable
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General
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- [ ] Annotations correctly set (readOnlyHint
destructiveHint
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Coding & Debugging
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- [ ] Tools enable complete workflows
not just API endpoint wrappers
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General
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- [ ] All tools include `title`
`description`
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General
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- Common operations like pagination
filtering
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General
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Before finalizing your Node/TypeScript MCP server implementation
ensure:
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General
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- If you find yourself writing similar logic twice
extract it into a function
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General
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- **stdio**: Command-line tools
local development
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General
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- **Streamable HTTP**: Web services
remote access
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