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

Annotations mark the tool as destructiveHint=true and readOnlyHint=false, directly contradicting the description's 'Fetch' behavior. Because the description conflicts with the annotations, an agent cannot trust whether the operation is actually a read or has destructive side effects.

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 sentence with no filler and the action is front-loaded. It is appropriately concise for a one-parameter lookup tool.

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?

The description is too sparse relative to the annotations: it does not clarify the destructive behavior implied by destructiveHint=true, nor does it address not-found behavior or return shape in the absence of an output schema. An agent would not have enough coherent context to invoke the tool safely.

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%, so the schema already documents the id parameter, and the description only restates it as 'by id'. The description adds no extra semantic detail beyond what the input schema provides.

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 (Fetch), a resource (a stored Map's key->value data), and a selector (by id), so an agent can identify this as a single-map lookup. It is distinguishable from siblings like sim_map_list or sim_map_put, but it does not explicitly name those alternatives, so it misses a 5.

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?

No guidance is given about when to use sim_map_get instead of sim_map_list or sim_map_put, and there are no when-not-to-use conditions. The only clue is the phrase 'by id', which is more parameter semantics than guidance for tool selection.

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