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Most MCP problems fall into a few buckets. Match the symptom to the cause below.

The error shape

Every tool error is a JSON object an agent can branch on:
The code is one of a fixed set: unauthorized, forbidden, not_found, invalid_input, invalid_framework, too_many_fields, field_too_large, internal_error.

Install

Per-client install commands.

API tokens

Full vs setup token scopes.