Google Cloud MCP Server

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the tool sets a default project ID for all operations, implying a state-changing or configuration action, but doesn't clarify if this is persistent across sessions, requires specific permissions, has side effects on other tools, or what happens on failure. This is inadequate for a mutation tool with zero annotation coverage.

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, clear sentence that efficiently conveys the core functionality without unnecessary details. It is front-loaded and wastes no words, making it easy for an agent to parse quickly.

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?

Given the tool's complexity as a state-setting operation with no annotations and no output schema, the description is insufficient. It doesn't explain the behavioral impact (e.g., persistence, error handling), return values, or how it integrates with sibling tools, leaving significant gaps for an agent to use it correctly in context.

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% description coverage, with the single parameter 'project_id' well-documented in the schema. The description adds no additional parameter semantics beyond what the schema provides, such as format examples or validation rules, so it meets the baseline score of 3 for high schema coverage.

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 tool's purpose with a specific verb ('Set') and resource ('default Google Cloud project ID'), and specifies the scope ('for all operations'). However, it doesn't explicitly differentiate from its sibling tool 'gcp-utils-get-project-id', which appears to retrieve rather than set the project ID.

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 no guidance on when to use this tool versus alternatives, such as its sibling 'gcp-utils-get-project-id' or other GCP tools that might require project context. It also lacks information on prerequisites, like whether authentication is needed or if this affects subsequent operations.

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