Get Slack Thread Replies

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

Annotations already cover read-only and idempotent behavior, but the description claims 'all replies' while the schema includes a limit parameter with default 100 and maximum 200. This is misleading and no disclosure is made about truncation or pagination behavior, so the description adds value that conflicts with actual behavior.

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 compact and front-loaded with the main purpose, followed by a simple Args list. It is efficient but slightly incomplete because it lists only two parameters while the schema defines three, and the return description is minimal.

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?

Given the tool's moderate complexity and the presence of strong annotations and a complete schema, the description provides adequate basic information. However, it lacks mention of the limit parameter's effect, returns a vague 'list of messages' without field details, and fails to provide usage context. These gaps make it only minimally 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?

Schema description coverage is 100% for all three parameters, and the description merely repeats channel and thread_ts without adding syntax or format details. The optional limit parameter is omitted from the description, so no additional semantic benefit is provided beyond the schema.

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 'Fetch all replies in a Slack thread' with a clear verb and resource, and it is unambiguous among sibling tools like channel history or search. The inclusion of required parameters channel and thread_ts reinforces the specific purpose.

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 about when to use this tool versus alternatives such as slack_get_channel_history or slack_search_messages. The thread-specific context is implied but not explicitly contrasted, so an agent may not know which tool is best for a given scenario.

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