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

Annotations already declare readOnlyHint and openWorldHint, so safety is covered. The description adds that the figure is a 'public CLOB' midpoint, clarifying the data source, but says nothing about staleness, precision, or behavior on inactive/illiquid tokens.

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 front-loaded sentence with no filler; the resource, scope, and data source are all in the first clause.

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?

An output schema exists, so return values need not be explained, and the tool is a simple one-param read with annotations covering the safety profile. The only real gap is not pointing the agent to where a valid CLOB token id comes from.

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 100% (the single token_id param is documented as a 'Polymarket CLOB token id'), so the schema does the heavy lifting. The description only reinforces the cardinality ('one token id') without adding format or provenance detail.

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 and resource ('returns the ... midpoint') scoped to a single token id. The 'for one token id' qualifier implicitly distinguishes it from the batch sibling polymarket_tokens_midpoints, but no sibling is named explicitly.

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?

Usage is only implied: the singular 'one token id' suggests this is the single-token counterpart to a batch endpoint, but the description never states when to prefer this over polymarket_token_price, polymarket_token_spread, or polymarket_tokens_midpoints.

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