meta-mcp

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 but fails to mention that this creates public content, potential rate limits, whether it triggers notifications, or what happens if reply_to_id references a deleted post. The write nature of the operation is only implied, not stated.

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 single sentence is efficient and front-loaded with the essential verb and resource. However, given the complexity of social media publishing and lack of annotations, the description may be overly terse rather than appropriately concise, leaving critical safety and usage information unstated.

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?

As a write operation with no annotations and no output schema, the description inadequately prepares the agent for invocation. It omits visibility implications (public reply), media restrictions beyond URL format, authentication requirements, and error handling scenarios essential for social media publishing tools.

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 input schema has 100% description coverage, documenting all four parameters (reply_to_id, text, image_url, video_url) including the maxLength constraint on text. The description adds no additional semantic context beyond the schema, meeting the baseline expectation when schema coverage is high.

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 core action (reply) and target resource (Threads post or reply), distinguishing it from sibling tools like threads_publish_text (original posts) and ig_reply_to_comment (Instagram platform). However, it lacks specificity about the operation type (write/mutation) and scope constraints.

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 is provided for when to use this versus alternatives like threads_publish_text for original content, or prerequisites such as needing to obtain a post ID first via threads_get_posts. There are no exclusions or failure mode warnings (e.g., cannot reply to private accounts).

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