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

With no annotations present, the description carries the full burden. It implies a read-only keyword search and discloses the two platforms covered, but says nothing about pagination defaults (page=1, page_size=10), whether results include total counts, or how date bounds affect matching.

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 two substantive sentences are front-loaded and efficient. However, the appended '### Responses: 200 Successful Response' block is boilerplate that conveys no information since no output schema exists, and it dilutes the useful content.

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 six-parameter tool with no annotations and no output schema, the description is too thin: it doesn't explain return shape (fields, ordering, truncation), how date filters interact with the keyword search, or pagination behavior. An agent would have to guess at result-set semantics.

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 67%; q, gte, lte, and platform are documented in the schema, but page and page_size have no descriptions anywhere. The description adds nothing beyond keyword and platform hints, so it does not compensate for the uncovered pagination parameters.

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 gives a specific verb and resource: search the IM database for channels by keyword, returning Telegram or Discord channels. The noun 'channels' naturally separates it from siblings like search_im_messages and search_im_profiles, though it never names those alternatives explicitly.

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?

'Use to find channels related to a topic' is an explicit but thin when-to-use statement. There is no guidance on when a different search tool (messages, profiles, email-in-IM) is the right choice, and no exclusions or prerequisites.

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