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

The annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior, and the description reinforces this with 'Read-only.' The added value is the indication that it recognizes 'current boundaries,' which suggests a state-aware, non-mutating inspection. However, it does not explain what the returned boundaries look like or how the result should be interpreted, so behavioral transparency is adequate but not rich.

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 a single concise sentence plus 'Read-only.' It front-loads the core action, states when to use it, and adds the key safety qualifier. Every phrase earns its place, with no redundant 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?

Given the tool has no parameters and strong annotations, the description is mostly sufficient for invocation. However, there is no output schema, and the description does not clarify the format or content of the recognized 'boundaries' or what the agent should do with the returned information. The purpose is clear enough, but the return semantics are left underspecified.

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 input schema has zero parameters and 100% schema description coverage, so there is no parameter burden for the description to carry. The 0-parameter case is the baseline of 4, and the description correctly introduces no conflicting parameter information.

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 uses a specific verb, 'Recognize', and a specific resource, 'the free textual descent and its current boundaries', and adds the timing 'before choosing a level'. This separates it from action-oriented siblings like enter_level, especially with the explicit 'Read-only' qualifier. However, the phrase 'free textual descent' is somewhat domain-specific and not fully defined, preventing a perfect score.

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 clearly indicates when to use the tool: before choosing a level. This gives a clear sequencing context relative to level selection. It does not explicitly name alternatives or state when not to use it, but the 'before choosing a level' guidance is concrete enough for an agent to time the call correctly.

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