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

With no annotations, the description carries the full burden and does disclose the most important trait: no persistence and no award, i.e. side-effect-free validation. 'Public bounded checker only' also hints at sandboxed/limited execution. It still omits auth requirements, rate limits, and whether validation failures are returned as errors or results.

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?

Two tight sentences, front-loading the action and the no-side-effects qualifier. No filler, nothing redundant with the name.

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 a deeply nested challenge/checkerProgram schema, no output schema, and no annotations, the description is thin on what the caller receives back (validation verdict, computed outcome, error shape) and on the grammar limits it merely gestures at with 'bounded.' Adequate but leaves real gaps for a complex tool.

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?

At 50% schema coverage the description should compensate more, but it only echoes that the answer is optional and adds no semantics about the checker grammar, rule assertions, or outcome fields that the nested schema leaves partly unexplained. It matches the schema without enriching it.

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?

States a specific verb (validate) and resource (challenge and optional answer) plus the crucial scope qualifier 'without persisting or awarding anything,' which implicitly separates it from declare_challenge (persists) and score_challenge (awards). An agent can tell this is the dry-run path without opening any schema.

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 dry-run framing implies 'use this before declaring,' but no explicit when-to-use, prerequisites, or named alternative appears. The agent must infer that this is the pre-flight check for declare_challenge rather than being told so.

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