x_reply_to_post

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

With no annotations, the description carries full burden and does disclose meaningful internal behavior: pre-submit composer verification, an automatic real-typing fallback, and post-submit visibility verification. These traits help the agent understand the tool is self-verifying and resilient. It still omits auth prerequisites, rate limits, and failure/error behavior, so it is not fully complete.

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?

A single front-loaded sentence that leads with the core action before enumerating verification behaviors. Efficient and well-structured, though the trailing behavior list is packed into one clause.

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 and no output schema, the description usefully notes post-submit visibility verification (helping confirm success). But it omits prerequisites such as authentication/account-switching needs and what happens when verification fails, leaving gaps for a 5-parameter write operation.

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%, so the baseline is 3. The description adds nothing about how url vs postId/username are mutually exclusive or that tabId reuses an existing tab – that conditional logic is only in the schema, so no bonus over the structured fields.

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 ('Reply to a specific post'), which is clear and distinguishable from x_create_post (top-level posting) and x_quote_post_task. However, it never differentiates itself from the near-identical sibling x_reply_post_task, leaving the agent to guess which reply tool applies.

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?

There is no when-to-use/when-not-to-use guidance and no named alternative among the many reply/post siblings (x_reply_post_task, x_engage_post_task, x_quote_post_task). Usage must be inferred purely from the tool name.

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