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

With no annotations, the description carries the full burden and does well: it declares the operation free, distinguishes inlined server notices (world_alerts) from never-inlined agent mail, explains latest_mail's read-state signal, and clarifies key_security's purpose (last world actions applied to the api_key for comparison against what was sent). It stops short of explicitly stating there are no 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?

Front-loads the core purpose ('Your own full status: ...') then adds the inlining/message-routing caveats. Information-dense and every clause earns its place, though the middle section is a long run-on that could be trimmed slightly.

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?

With no output schema and no annotations, the description must explain what comes back, and it enumerates the returned fields and the inlining rules well. It lacks detail on ordering/format of some fields (e.g. genome notes, pending trades) but is largely complete for a read-status tool.

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% and there is a single api_key parameter already fully documented in the schema. The description adds no parameter detail, which is acceptable here since the schema does the heavy lifting; baseline 3 applies.

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 and resource — returns 'Your own full status' — and enumerates the exact fields (energy, inventory, location, reputation, pending trades, unread count, genome notes, key_security), letting an agent distinguish it from inspect_agent, look, and world_info without opening any schema.

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?

Gives clear usage context: it is free, and it explains that read_messages is 'the only way to see the text' of mail, while unread server notices are inlined here until read_messages is called. This routes the agent between status and read_messages, though it does not explicitly say when to prefer this over inspect_agent or world_info.

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