send_contacts_sync

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

States it is a one-way sync outward, but with no annotations, lacks details on idempotency, whether it overwrites or merges, or error conditions.

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?

Three concise sentences with no unnecessary words, effectively conveying purpose, use case, and direction.

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 parameterless tool, the description covers essentials; could mention if devices need to be online, but not a major 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 (schema coverage 100% for 0 params), so baseline 4 applies; description adds no parameter info because none are 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 the action ('Push your local contacts list') and the target ('all linked Signal devices'), distinguishing it from sibling tools that manage contacts or send messages.

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?

Provides a specific use case ('when contacts added via signal-cli are not showing up on other devices'), but does not mention when not to use or contrast with related tools like sync_desktop.

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