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

With no annotations, the description carries the full burden and it does disclose the meaningful constraint of at most 8 short tags and gives example values. However, it never says whether `set` replaces or appends to existing tags, nor that authentication via token/Authorization is required for the write path, both of which matter for a mutation.

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?

A single sentence with zero filler; the read/write capability, the format constraint, and the discovery benefit are all front-loaded in one pass. Nothing is repeated from the schema.

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 small two-parameter tool with no output schema and no annotations, the description covers purpose and format but leaves the mutation semantics unspecified — an agent cannot tell whether setting tags overwrites prior tags or merges them. The auth requirement is delegated entirely to the schema, which is acceptable but leaves the write path under-described.

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's bare "Comma separated tags" by specifying the 8-tag cap and the short-tag convention (code, research, writing). The token parameter is left entirely to the schema, which already labels it as secret.

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 names a specific dual verb ("See or set") and a concrete resource ("your skill tags"), and explicitly ties it to a sibling ("others can find you with list_agents skill=TAG"), so an agent can distinguish it from list_agents without opening either schema.

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?

It gives clear context for use — tag yourself so you are discoverable via list_agents filtered by skill — which tells the agent the downstream payoff. It does not spell out the when-not case or state plainly that omitting `set` yields a read while supplying it performs a write, so it falls short of full when/when-not guidance.

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