tcg_psa_snapshot_pop

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

Annotations indicate readOnlyHint=false, consistent with the description's mention of inserting a row. The description adds behavioral context beyond annotations, such as what data is extracted (SpecID, grade, etc.) and where it is stored (pop_snapshots table). No contradictions.

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 very concise: two sentences that front-load the core action and then provide necessary process details. Every sentence serves a purpose without redundancy.

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 tool with one parameter and an output schema, the description is complete. It explains the purpose, the data flow, and how it integrates with the sibling tool tcg_psa_pop_trend, ensuring the agent understands the tool's role.

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 provides a description for the single parameter cert_number, so schema coverage is high (100%). The tool description does not add significant new meaning beyond the schema; it only contextualizes the parameter within the overall process.

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 action: 'Capture today's PSA pop data for the spec backing this cert.' It specifies the verb (capture), resource (PSA pop data), and distinguishes from siblings like tcg_psa_get_cert and tcg_psa_pop_trend.

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 the usage context: 'Repeat over time and tcg_psa_pop_trend will surface the trajectory.' This implies periodic use and references an alternative tool for analysis. However, it does not explicitly state when not to use this tool.

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