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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered by structured data. The description only adds 'server-side filtered', a minor note about where filtering happens; it says nothing about result size, pagination, or ordering.

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 short sentences with zero filler, and the scoping fact plus the key flag tip are both front-loaded. Nothing repetitive or padded.

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 two-parameter read-only list tool with full schema coverage, complete annotations, and no output schema to explain, the description covers what an agent needs. Slightly short of a 5 because it leaves the ordering/result-size behavior of the listing unstated.

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 100%, so both parameters are already documented inline. The description clarifies milestonesOnly as 'just that project's milestones', marginally reinforcing the schema, but adds no format, constraint, or edge-case detail beyond it. Baseline 3 applies.

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?

Uses a specific verb+resource ('List tasks') with an explicit scope constraint ('belonging to one project', 'server-side filtered'), which implicitly distinguishes it from the unscoped sibling list_tasks. A sibling tool name is never cited outright, so the differentiation is inferential rather than explicit.

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?

The phrase 'server-side filtered' plus the milestonesOnly pointer implies when to reach for this tool, but it never states when to prefer the sibling list_tasks instead, nor any prerequisites (e.g. that projectId must be valid/accessible). Usage is implied rather than spelled out.

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