list_projects

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

With no annotations, the description carries the full burden, but "accessible with your API key" does disclose a real behavioral trait: results are permission-scoped, not a global listing. It stops short of covering pagination, result size, or failure behavior for an invalid key.

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 front-loaded sentence with no filler, and the scoping qualifier sits where it matters. It is efficient, though at this length it leaves room to add one clause of usage context without becoming bloated.

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 zero-parameter read tool this is close to sufficient, but there is no output schema, so the description could have named the returned fields (id, name, identifier) that other tools require. That omission is the main gap for an agent trying to chain calls.

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?

The tool takes zero parameters, so there is nothing for the description to document; baseline 4 applies. The only semantic note (API-key scoping) is already present and correctly framed as a filter rather than a parameter.

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?

States a specific verb and resource ("List all Redmine projects") and adds a scope qualifier ("accessible with your API key"), so the agent knows exactly what comes back. It does not, however, differentiate itself from the other listing siblings (list_trackers, list_statuses, list_time_entry_activities), which follow the same pattern.

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?

There is no guidance on when to call this versus the sibling list tools, and no statement of prerequisites or follow-up use (e.g. that the returned project identifiers feed into search_issues or create_issue). The agent must infer the call context entirely.

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