ga4_create_measurement_protocol_secret

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

With no annotations provided, the description carries the full burden. It discloses that the response contains a secretValue to store securely and that confirm must be true to apply changes. However, it lacks details on authorization requirements, rate limits, or side effects beyond creating the secret.

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 a single, efficient sentence followed by a critical note. It front-loads the purpose and uses explicit tags like '[GA4 WRITE]'. Every word serves a purpose; there is no fluff.

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?

There is no output schema, so the description compensates by mentioning the secretValue and its sensitivity. It also covers prerequisites and the confirm flag. However, it omits error scenarios or response structure beyond the secret value, leaving some gaps for a complex operation.

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?

The input schema has 100% coverage with detailed descriptions for each parameter. The description adds minimal extra: only the security note about the secret in the response. Since the schema does the heavy lifting, the baseline score of 3 is appropriate.

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 clearly states the action ('Create') and the resource ('Measurement Protocol secret') with context ('on a data stream'). It uses '[GA4 WRITE]' to signal the operation type. However, it does not differentiate from numerous sibling ga4_create_* tools, leaving potential ambiguity.

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 explicitly states required prerequisites: 'GA4_MCP_ENABLE_WRITES=true and confirm=true'. This helps the agent decide when invocation is valid. There is no discussion of alternatives or when not to use the tool, but the specificity of the use case reduces ambiguity.

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