trend_init

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

No annotations are provided, so the description carries the full burden. It discloses the conditional creation and returned path, which is adequate for a simple tool. However, it omits details like error handling, file locking, or whether existing DBs are overwritten (implied not, but not explicit). With no annotations, more transparency would be beneficial.

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 concise sentence that front-loads the action and outcome. It contains no superfluous information. While it could be slightly more structured (e.g., listing side effects), it is efficient.

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 zero parameters and the existence of an output schema (implied), the description provides the essential purpose and return. It does not explain relation to siblings or prerequisites, but for a simple init tool, it is sufficiently complete. The context signals confirm no parameters and an output schema, so the description does not need to detail return values.

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 tool has zero parameters, so the schema coverage is 100% trivially. The description adds no parameter-level detail, but none is needed. Baseline for 0 params is 4, and the description is adequate.

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 creates a local SQLite snapshot DB conditionally and returns its path. The verb 'create' and resource 'local SQLite snapshot DB' are specific, and the condition 'if it doesn't exist' adds clarity. However, it does not explicitly differentiate from sibling snapshot_* tools, which may have overlapping functionality.

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. Given multiple sibling tools like snapshot_gsc and trend_gsc, an explicit context or prerequisite relationship would help. The tool likely serves as initialization, but this is not stated.

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