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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered without the description's help. The description adds only a list of returned fields, which largely duplicates the output schema, and says nothing about error behavior for missing ids or result freshness.

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?

One front-loaded sentence with no filler; the verb and source of the id come first. The trailing field enumeration is slightly redundant with the output schema but is short enough not to be wasteful.

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 a single fully-described parameter, rich annotations, and an output schema that carries return-value detail, the description is nearly sufficient for correct invocation. The only real gap is the absence of any note on invalid/unknown ids or on how this differs from channel_stats.

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% and the single `id` parameter is already documented in the schema as 'Id of a `search` result, e.g. channel:durov'. The description's 'by its id' adds no format or provenance detail beyond that, so the baseline of 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 and resource: 'Read one result of `search` by its id as a document', and enumerates the returned content (title, description, audience size, categories, tgden.com page). It explicitly anchors the resource to `search` results, which distinguishes it from siblings like channel_stats or search_telegram.

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?

The description makes the workflow clear: this is the detail-fetch step for an id obtained from `search`, so an agent knows it should call search first. It does not, however, say when to prefer this over a related sibling such as channel_stats, nor does it state what happens for an unknown id.

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