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

Annotations already declare readOnlyHint and idempotentHint, so the safety profile is covered. The description adds useful behavior beyond annotations: the existence of a special tax guide, the list-when-omitted behavior, and that guides contain 'detailed progression paths with real game data.' No contradiction is present.

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?

The description is compact and front-loaded, with the core purpose in the first sentence and usage variants in a parenthetical. No filler or redundant restatement exists; every phrase contributes to correct invocation.

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?

For a simple read-only guide lookup with no output schema, the description provides sufficient return expectations: listing titles when omitted, and detailed progression paths otherwise. Session handling is fully covered by the schema, and annotations cover safety. Nothing essential is missing.

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 schema already documents both parameters well, including the 'omit to list' behavior for 'guide'. The description adds one meaningful semantic—'use guide=taxes'—but 'taxes' is not present in the enum, which could mislead an agent into supplying an invalid value. Since schema coverage is 100%, the description does not add enough consistent value to exceed baseline.

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 and resource: 'Get a detailed playstyle progression guide.' It enumerates covered topics (ship upgrades, skill training, crafting chains, grinding strategies) and distinguishes the special tax guide and listing behavior. There is no ambiguity about what this tool returns, and it is clearly different from sibling get_* tools.

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 gives explicit usage conditions: use 'guide=taxes' for tax-related instructions and omit 'guide' to list available guides. This is clear context for deciding how to invoke the tool, though it does not discuss alternatives or exclusions relative to siblings, which are largely irrelevant for a guide-lookup tool.

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