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

Annotations already declare this is a non-readOnly, idempotent, non-destructive, open-world mutation. The description adds useful outcome context by saying the parties can then message each other with dm_say, but it does not cover authorization requirements, failure cases, or what happens if the request is not pending.

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 front-loaded sentence with no wasted prose. The core action appears first, followed by a brief source reference and outcome.

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 simple one-parameter mutation, the description covers the action, the pending-request source, and the post-accept messaging outcome. However, it leaves the only parameter undefined and does not address edge cases, so it is adequate but not complete.

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 schema has 0% description coverage for the single required parameter, 'from', and the description never defines it. The reference to contacts_mine lightly implies where to find the pending request identifier, but it does not clarify the expected format or semantics of 'from'.

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 and resource: 'Accept a pending contact request.' It also clarifies the resulting capability, messaging via dm_say, but it does not explicitly differentiate this from related siblings such as contact_request or contact_block.

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?

It clearly indicates the relevant context by pointing to contacts_mine for pending requests. It does not state when not to use the tool or name alternative actions, so it lacks explicit exclusions but gives usable guidance.

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