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

No annotations are present, so the description carries the full safety burden. It clearly discloses that the operation is read-only ('without sending a message') and restricted to the current match, which are key behavioral traits. It does not cover error cases like no active match, but the output schema handles return shape.

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?

One concise sentence with no filler. The verb and resource are front-loaded, and the side-effect disclaimer is placed at the end where it reinforces rather than obscures the main purpose.

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?

This is a simple read tool with one optional parameter and an output schema, so the description does not need to explain return values. It covers scope and side-effect profile sufficiently. An explicit mention of the limit parameter would improve completeness, but it is a minor gap given the overall simplicity.

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 single limit parameter has 0% schema description coverage, and the description never mentions it or explains that it controls how many recent messages are returned. The parameter name and default give only a partial hint, so the description adds little semantic value beyond the schema.

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 states a specific verb ('Read'), a resource ('recent in-game chat'), and a scope ('current match'). The phrase 'without sending a message' clearly differentiates it from the sibling arcade_chat, so an agent can select the right tool without ambiguity.

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 implies the tool is for read-only chat access and explicitly excludes sending a message, but it never names the alternative tool or provides a direct 'use this when...' condition. Context is clear but the guidance is mostly implied rather than explicit.

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