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

Annotations already declare this is a non-readonly, non-destructive, non-idempotent, closed-world write. The description adds real value on top: it states a validation constraint ("eligible workspaceId") and a concrete side effect ("this changes the workspace's project list"), plus what is returned. It stops short of describing failure modes or duplicate-name behavior.

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 sentences, zero waste, with the workspace/ID requirement front-loaded ahead of the return and side-effect note.

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 2-parameter create tool with no output schema, the description covers inputs, return, and the workspace-level consequence. Only the eligibility definition and error/duplicate behavior are missing, which are minor for this complexity.

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 0%, so the description must carry the parameter burden. It does name both parameters and adds the source of workspaceId (list_projects) plus the selection criterion, but leaves the name constraints (1-256 chars) and the actual meaning of "eligible" undefined.

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?

Specific verb+resource ("Create a Replo project") with a stated scope ("in a workspace"). It does not explicitly contrast with update_project or get_project, so the sibling differentiation is only implied by the verb.

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?

Gives a concrete prerequisite and even names the sibling that supplies it: "Requires an eligible workspaceId from list_projects." No when-not-to-use guidance or exclusions are stated, and "a workspace selected for the user's requested work" stays vague about what makes a workspace eligible.

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