prepare_fixture

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

Annotations already declare readOnlyHint=true and idempotentHint=true, but the description adds meaningful behavioral context by stating the tool does not execute the fixture. The 'validate and expand' actions are described, and no contradiction with annotations exists.

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?

A single sentence of twelve words, front-loaded with the action and resource. Every word earns its place, with the key qualifier 'without running it' immediately disambiguating from run_fixture.

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 tool with four optional parameters and an output schema, the description covers purpose and the key non-execution trait, but omits any parameter guidance. It is complete enough as a high-level preparation step, but lacks sufficient detail to fully configure the tool without external knowledge.

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 0% parameter description coverage, yet the description does not explain what analysts, as_of_date, risk_rounds, or debate_rounds mean or how they influence validation/expansion. It provides no semantic value beyond the schema's parameter names and defaults.

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 uses specific verbs 'Validate and expand' to identify the action, names the resource 'deterministic ORCL fixture', and also distinguishes it from running the fixture via 'without running it'. This clearly differentiates it from sibling tools like run_fixture.

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 phrase 'without running it' clearly indicates this is a pre-run preparation step, providing context on when to use it relative to run_fixture. However, it does not explicitly list when not to use it or mention alternatives, so it stops slightly short of full guidance.

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