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

Annotations already declare readOnlyHint=false, destructiveHint=false and idempotentHint=true, but the description adds non-obvious side effects: the slug is derived from the name and is immutable, and the caller becomes project Admin. These are behavior details the schema and annotations do not carry.

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 short sentences, purpose front-loaded, and every clause carries information (UI equivalence, slug rules, resulting role, permission floor). The comma splice is slightly awkward but the density is appropriate.

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 single-parameter creation tool with no output schema, the description covers purpose, side effects, immutability of the derived slug, and required role. Nothing essential is missing, though a note on what the response contains or duplicate-name behavior would round it out.

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?

Only one parameter with 100% schema coverage, so the baseline is 3. The description goes beyond the schema by explaining the name's downstream effect (slug derivation and immutability), though it does not restate the two-character/digit minimum.

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?

Names a specific verb+resource ('Creates a project') and anchors it to the concrete UI equivalents ('New project in the switcher or Settings › Projects'), which makes it easy to distinguish from siblings like create_access_group or create_tag. No ambiguity about what the tool produces.

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?

'Member and above' gives a role prerequisite, which is useful invocation context. However, there is no explicit when-to-use/when-not guidance and no routing against neighboring creation tools (e.g., create_access_group, create_api_key), so usage is only implied.

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