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

Annotations already declare readOnlyHint, idempotentHint and non-destructive, so the safety profile is covered. The description adds only the period/anchor semantics and the personal-vs-project planner distinction, which is modest added context rather than rich behavioral detail.

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 tight sentences with no waste; the read scope is front-loaded and the parameter guidance follows. Slightly more than strictly needed but efficient.

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 read-only tool whose annotations cover the safety profile and which has an output schema, the description conveys what an agent needs: resource, period, and the personal/project branch. Nothing essential is missing.

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 the schema already documents all three parameters including the projectId omission rule. The description largely restates what the schema provides, so the baseline 3 is appropriate with no meaningful added value.

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: 'Read planner content', scoped to a period anchored on a date. It does not explicitly differentiate from siblings like get_project_content or get_collection_content, but the resource is named clearly enough to distinguish.

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 description explains the projectId branch ('Provide projectId for a project planner, or omit for your personal planner'), which is usage context. However, it gives no explicit when-to-use vs. alternatives or exclusions relative to the many get_* siblings, leaving that to inference.

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