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feat: Add tool annotations based on HTTP method #258

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feat: Add tool annotations based on HTTP method #258

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3612fef
feat: Add tool annotations based on HTTP method
web-flow Dec 29, 2025
e4e3eba
fix: Mark POST/PUT/PATCH as destructive per review feedback
web-flow Dec 31, 2025
8db144d
fix: only mark DELETE as destructiveHint=true
triepod-ai Dec 31, 2025
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17 changes: 15 additions & 2 deletions fastapi_mcp/openapi/convert.py
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Original file line number Diff line number Diff line change
Expand Up @@ -259,8 +259,21 @@ def convert_openapi_to_mcp_tools(
if required_props:
input_schema["required"] = required_props

# Create the MCP tool definition
tool = types.Tool(name=operation_id, description=tool_description, inputSchema=input_schema)
# Create the MCP tool definition with annotations based on HTTP method
annotations = types.ToolAnnotations(
title=operation_id,
readOnlyHint=(method == "get"),
destructiveHint=(method == "delete"), # Only DELETE destroys data
idempotentHint=(method in ("get", "put", "delete")), # GET, PUT, DELETE are idempotent
openWorldHint=True, # All generated tools call external APIs
)

tool = types.Tool(
name=operation_id,
description=tool_description,
inputSchema=input_schema,
annotations=annotations,
)

tools.append(tool)

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