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

Annotations already establish readOnly and non-destructive, and the description adds genuinely new context: the data is private to the caller, spans both attempt and action history, and the tool degrades to a list operation when attemptId is omitted. It does not explain ordering, page size, or what happens when an invalid attemptId is supplied.

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 that front-loads the primary purpose and appends the mode switch as a trailing clause. No filler.

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?

Two parameters with no output schema means the description should convey what the returned history looks like; it only says 'attempt and action history' without describing shape, recency window, or how many 'latest attempts' are returned. Adequate to call correctly, but thin for a tool whose return value is undocumented elsewhere.

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 description usefully explains that omitting attemptId triggers list mode, which is the most important semantic of that parameter. However, the game parameter is not described beyond implying the two game names, and the attemptId schema text is a tautology ('Attempt ID'), so with 50% coverage the description only partly compensates.

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 (read) and resource (your diagnostic attempt and action history) and names the two game contexts it covers. It cleanly separates from siblings like start_diagnostic_attempt and act_on_diagnostic_attempt by the read verb, though it does not name those siblings 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?

Explicitly describes the two invocation modes: pass attemptId to read a specific attempt's history, omit it to list latest attempts. That conditional is a real usage rule, but no guidance is given on when to prefer this over related tools such as read_check or start_diagnostic_attempt.

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