ga4_update_event_create_rule

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

No annotations provided, so description bears full burden. It discloses the write operation, updateMask behavior (derived vs explicit), and prerequisites. It does not cover error conditions or idempotency, but key behavioral aspects are addressed.

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?

Two concise sentences: first states purpose and scope, second gives usage notes. No filler, front-loaded with key information.

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?

Covers purpose, parameters, prerequisites, and updateMask behavior. Lacks mention of return value (no output schema), but for a verified write tool with nested objects, essential context is provided.

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 100%, but description adds value: explains 'body' for nested/advanced fields, updateMask derivation, and that confirm must be true. This helps the agent understand parameter interplay beyond schema definitions.

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] Update an event-create rule', clearly specifying the action (Update) and resource. It differentiates from sibling tools like ga4_create_event_create_rule and ga4_delete_event_create_rule.

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 explains when to use: updating an existing rule, with guidance on partial updates and updateMask. It notes prerequisites (GA4_MCP_ENABLE_WRITES=true, confirm=true). It does not explicitly state when not to use or alternatives, but context is sufficient.

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