ga4_update_account_access_binding

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries full burden. It discloses that this is a write operation, requires permission 'analytics.manage.users', and explains the updateMask derivation and the necessity of confirm=true. This covers key behavioral aspects, though it could mention outcome details (e.g., success response).

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is two sentences, front-loaded with the operation type, and every sentence provides essential information. No redundant text, making it highly efficient for an AI agent to parse.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple update tool, the description covers the necessary context: operation type, required permissions, parameter usage strategy, and configuration requirements. Given the absence of output schema, it is complete enough to guide correct usage without ambiguity.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 75%, so baseline is 3. The description adds value by explaining the intention behind the parameters: 'Pass only the fields to change' and dynamic updateMask handling. This complements the schema descriptions and helps the agent understand parameter relationships.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description starts with '[GA4 WRITE]' and states 'Change a user's roles on an account', clearly specifying the action on a distinct resource. It distinguishes from sibling tools like ga4_create_account_access_binding and ga4_delete_account_access_binding by indicating it is an update operation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides clear guidance: 'Pass only the fields to change; updateMask is derived from them' and mentions required configuration ('GA4_MCP_ENABLE_WRITES=true and confirm=true'). It does not explicitly specify when not to use this tool versus alternatives, but the guidance is sufficient for correct invocation.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.