list_contacts

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

No annotations provided, so descriptions carries the burden. 'List' implies read-only, but does not explicitly state it is non-destructive or safe. With zero annotations, a note that it only reads data would improve transparency. Still, the intent is clear.

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?

Single sentence, zero waste. Perfectly concise for its purpose.

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?

Output schema exists, so return values are documented. The description is complete for a simple list-all tool. However, lacking usage context like performance considerations or pagination (if any) – though no parameters suggest no pagination. Minor gap.

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?

No parameters exist, and schema coverage is 100%. Baseline for 0 params is 4. The description adds no parameter info, but none is needed.

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 clearly states it lists all Telegram contacts (verb '列出' + resource '通讯录里的所有 Telegram 联系人'). However, it does not explicitly distinguish from sibling tool 'search_contacts', which is for searching rather than listing all. Slight improvement possible.

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 on when to use this tool vs alternatives like 'search_contacts' or 'add_contact'. The description implies it is for listing all, but does not explicitly state when not to use it or provide exclusion criteria.

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