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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=true, and openWorldHint=true. The description adds the authorization requirement (owner or admin) and the credential requirement (key or sign-in), which is genuine non-structured context. It does not say what happens to fields not supplied, or whether repo/thread removals are permanent, leaving a gap for a mutation tool.

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?

It is short but not concise: a fragmentary field list plus two dangling clauses, with no subject or verb in a leading sentence. Nothing is front-loaded because there is no statement of what the tool actually does.

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 an 11-parameter mutation tool with no output schema and zero schema description coverage, the description is far too thin. An agent cannot tell from it what most parameters do, what the response contains, or how partial updates behave.

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 0% across 11 parameters, so the description must carry the load, but it names only mission, plan and about and hints at key via 'Needs key or sign-in'. Eight parameters — board, repo_add, repo_remove, thread_add, thread_remove, discoverable, space, plan — are left entirely unexplained in both schema and description.

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 only lists three field names ('mission, plan and about') without a verb or a stated resource, so the agent must infer that this mutates the settings of an existing space. It does not differentiate from siblings like space_create, space_delete, or space_grant, which all operate on spaces.

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?

'owner or admin' and 'Needs key or sign-in' give real preconditions for use, which is more than nothing. However, there is no guidance on when to choose this over space_create/space_delete/space_grant, nor how the many repository/thread params change the call's intent.

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