mcp-wacli

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the action ('Rename') which implies a mutation, but doesn't disclose critical behavioral traits: whether this requires admin permissions, if there are rate limits, what happens on success/failure, or if the change is reversible. The description is minimal and lacks necessary operational context.

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 appropriately concise with a clear purpose statement followed by parameter explanations. The two-sentence structure is efficient with zero wasted words. However, the parameter documentation could be better integrated rather than presented as a separate 'Args:' section, and the overall brevity comes at the cost of completeness.

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 mutation tool with no annotations, 0% schema description coverage, and no output schema, the description is incomplete. It doesn't explain what the tool returns, error conditions, permission requirements, or operational constraints. Given the complexity of group management operations, this minimal description leaves too many unanswered questions for effective tool use.

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 0%, so the schema provides no parameter documentation. The description adds basic semantic meaning by explaining that 'jid' is the 'Group JID' and 'name' is the 'New group name', which clarifies what each parameter represents. However, it doesn't provide format details (e.g., JID structure, name length limits) or validation rules, leaving significant gaps.

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 verb ('Rename') and resource ('a WhatsApp group'), making the purpose immediately understandable. It distinguishes this tool from other group-related tools like group_info, group_join, or group_leave by specifying the rename action. However, it doesn't explicitly differentiate from all siblings beyond the obvious action distinction.

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?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., needing admin permissions), when renaming is appropriate, or what happens if the JID is invalid. There's no comparison to other group management tools like group_participants_add or group_participants_remove.

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