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 covered. The description adds value beyond that by naming the return fields (pack title, short name, add link format, catalogue page) — useful since there is no output schema. It stops short of describing result ordering or truncation behavior at the limit cap.

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 tight sentences with zero filler: capability and scope first, return shape second. Every clause carries information an agent needs.

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 three-parameter read-only search with no output schema, the description covers purpose and return contents well. The remaining gap is behavioral rather than descriptive: what limit does and whether results are ranked or paginated.

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 coverage is only 33% — only query is documented. The description partly compensates by implying the kind dimension ("emoji and sticker packs") and by broadening query semantics to theme, title, emoji or pack name. It says nothing about limit or its default of 10, so the compensation is partial.

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 ("Search") and resource ("Catalogue App library of Telegram custom emoji and sticker packs") plus the searchable dimensions (theme, title, emoji, pack name). That is enough to distinguish it from siblings like search_apps or search_channels, which target different catalogues.

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 search intent is implied and reasonably clear, but the description never states when to use this rather than create_pack (the sibling that adds packs) or how to choose between kind=emoji vs kind=sticker. No exclusions or alternative routing are given.

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