docs: clarify local vs signing region resolution#343
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Document that --region / endpoint URL / --metadata AWS_REGION control the signing region for the remote MCP server, while the proxy's local boto3 session resolves its own region from the standard provider chain (env or active profile) for credential refresh. Profiles without a persisted region (common with AWS CLI v2 `aws login`) hit NoRegionError at startup, which most MCP clients display as `-32602: Invalid request parameters`. Refs aws/agent-toolkit-for-aws#63
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Summary
--region/ endpoint URL /--metadata AWS_REGION=...set the signing region for the remote MCP server, while the proxy's localboto3session resolves its own region from the standard provider chain for credential refresh.NoRegionErrorat startup (commonly displayed as-32602: Invalid request parametersby MCP clients) — typical of AWS CLI v2aws loginprofiles with no persistedregion = ...line — to setAWS_REGIONin the MCP server's environment block.Refs aws/agent-toolkit-for-aws#63.
Test plan
AWS_MCP_PROXY_PROFILESnote and the Multi-account access heading.