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

Annotations declare a non-read-only, non-open-world write operation, and the description adds genuinely new behavioral facts: the name must be unique per person, uniqueness ignores case and surrounding whitespace, and omitting routes produces an empty group. It does not say what comes back on success (e.g. the new group's identifier) or what happens on a duplicate-name failure, which is a modest gap for a create tool with no output schema.

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?

Three tight sentences, front-loaded with the action and resource, then the eligibility rules. The uniqueness rule is partially echoed in the schema's own name description, so there is a small amount of duplication, but nothing is padding.

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 two-parameter mutation tool with full schema coverage and no output schema, the description covers the key constraints an agent must satisfy (unique name, optional route list) and explains the empty-group default. Only the success return value and failure behavior on a name collision are left unaddressed.

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 100%, so the baseline is 3, but the description adds real meaning beyond the schema by specifying that name uniqueness is evaluated case-insensitively and with trimmed whitespace, and that omitting 'routes' yields an empty group rather than an error.

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 opens with a specific verb and resource ('Создаёт группу маршрутов') and then defines what a group actually is ('общее название для нескольких маршрутов в списках кабинета и бота'), which is exactly the domain context an agent needs to avoid confusing it with route_create or route_set_group.

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?

Usage is only implied: the tool creates groups and optionally seeds them with routes, from which an agent can infer that it is the entry point before group_rename or route_set_group. There is no explicit when-to-use versus when-not-to-use statement and no sibling tool is named.

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