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

Annotations say destructiveHint=false but idempotentHint=false, while the description states idempotent retries ARE supported via idempotency key + nonce. This adds substantive behavioral context (nonce returned once, must be retained, not returned again; entry unseated until organizer confirms; write-gated) that annotations do not cover. It does not contradict annotations since the nonce-based retry is a distinct mechanism, though it merits a careful read.

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?

Short, front-loaded, every sentence carries a distinct fact (return value, nonce lifecycle, retry rule, identity constraint, seating rule, gate). Dense but readable; could group the nonce/retry sentences for flow.

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?

Output schema exists so return values need not be explained, yet 10 undocumented params with 0% coverage leave the parameter space largely opaque; identity_assurance's stated constraint (anonymous or declared) is the only enum-like hint. The nonce and write-gate are covered, but key capability defaults are not, so the definition is only partially complete for a 10-param creation 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?

Schema description coverage is 0% across 10 params, so the schema does not document them. The description explains only entry_nonce and, by implication, idempotency_key semantics; the other 8 params (arena_id, trial_id, host_claim, model_claim, provider_claim, evaluation_mode, competition_scope, identity_assurance) get no explanation. For a 10-param tool, this is a significant gap, and baseline is set accordingly low but raised by the nonce/key notes.

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?

Clear verb+resource: 'Create a Reality Trial 001 policy entry' specifies exactly what is created. The artifact name is specific enough that it doesn't need sibling differentiation, though it could name the read-side or verification sibling (e.g. artifact_verify) to anchor it further.

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?

Implied usage: 'Write-gated' and the nonce/retry note hint at the workflow, but there is no explicit when-to-use vs when-not-to-use, nor a pointer to which sibling continues the flow (e.g. artifact_verify). The agent can infer the entry-creation step but not the alternatives.

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