General
PromptBeginner5 minmarkdown
destructiveHint: False
# Tool does not perform destructive operations
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General
PromptBeginner5 minmarkdown
tags: Optional[List[str]] = Field(default_factory=list
description=List of tags to apply
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General
PromptBeginner5 minmarkdown
readOnlyHint: True
# Tool does not modify environment
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General
PromptBeginner5 minmarkdown
param2: Optional[int] = Field(default=None
description=Optional integer parameter with constraints
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General
PromptBeginner5 minmarkdown
validate_assignment=True
# Validate on assignment
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General
PromptBeginner5 minmarkdown
param1: str = Field(...
description=First parameter description (e.g.
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General
PromptBeginner5 minmarkdown
str_strip_whitespace=True
# Auto-strip whitespace from strings
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General
PromptBeginner5 minmarkdown
Use snake_case for tool names (e.g.
search_users
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General
PromptBeginner5 minmarkdown
from pydantic import BaseModel
Field
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Coding & Debugging
PromptBeginner5 minmarkdown
The official MCP Python SDK provides FastMCP
a high-level framework for building MCP servers. It provides:
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General
PromptBeginner5 minmarkdown
- **Examples**: `github_mcp`
`jira_mcp`
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General
PromptBeginner5 minmarkdown
**For complete SDK documentation
use WebFetch to load:**
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General
PromptBeginner5 minmarkdown
from pydantic import BaseModel
Field
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General
PromptBeginner5 minmarkdown
@mcp.tool(name=tool_name
annotations={...})
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General
PromptBeginner5 minmarkdown
from typing import Optional
List
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Coding & Debugging
PromptBeginner5 minmarkdown
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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- [ ] Error handling uses proper type guards (e.g.
`axios.isAxiosError`
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General
PromptBeginner5 minmarkdown
- [ ] Annotations correctly set (readOnlyHint
destructiveHint
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Coding & Debugging
PromptBeginner5 minmarkdown
- [ ] Tools enable complete workflows
not just API endpoint wrappers
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General
PromptBeginner5 minmarkdown
- [ ] All tools include `title`
`description`
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General
PromptBeginner5 minmarkdown
Before finalizing your Node/TypeScript MCP server implementation
ensure:
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General
PromptBeginner5 minmarkdown
- Common operations like pagination
filtering
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General
PromptBeginner5 minmarkdown
- If you find yourself writing similar logic twice
extract it into a function
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