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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds real behavioral detail beyond them: the 10-channel cap, the 30-day window for comparison changes, and the notable failure-tolerant behavior of listing unknown entries as unresolved rather than erroring.

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?

Two dense sentences, front-loaded with the single-channel case before the multi-channel case, with no filler. It is slightly heavy for a tool of this size but each clause carries information about mode or metrics.

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?

With an output schema present, the description need not explain return shapes, and it does not. It fully covers the input modes, the window semantics, the cap, and error handling, which is everything an agent needs to invoke it correctly.

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 schema already documents slug/id format, date patterns, and the 'single channel only' constraint on start/end dates. The description largely restates that the date range is optional and mode-dependent, adding little beyond the schema; baseline 3 applies.

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+resource pairing (retrieves a tracked Telegram channel's profile and metrics) and makes the mode-dependent behavior explicit. However, it never names a sibling tool such as search_channels or get_channel_posts, so an agent must infer routing from the sibling list alone.

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?

Gives clear context for the two modes: one channel for the full profile, several (up to 10) for compact comparison rows. It does not, though, state when to prefer this over siblings like get_channel_timeline or get_similar_channels; no exclusions are given.

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