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

Beyond the read-only and non-destructive annotations, it discloses result ordering and explains the operational meaning of zero slack: one day of critical-task delay moves the project finish by one day. The final "Read-only" merely repeats the annotations, and behavior for projects without usable schedule data is not covered.

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?

It is compact and front-loaded, putting the returned analysis first, then the key definition and sibling alternative. The trailing "Read-only" is redundant with structured annotations, so it is not quite zero-waste.

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 analysis, the description, complete input schema, and annotations provide enough information to select and invoke it correctly. Even without an output schema, it names the main result components and the critical chain's ordering; exact field-level response formatting is the only notable unspecified detail.

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 100%, and it already documents the projectId source plus nearThresholdDays units, default, and bounds. The critical and near-critical explanations help interpret the analysis but add little new invocation-specific parameter meaning, so the high-coverage baseline 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?

The description uses a specific verb and resource, listing the critical chain in date order, near-critical tasks, slack distribution, and missed deadlines. It also distinguishes this project-level analysis from planitude_delay_impact, making its role clear among the siblings.

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 output list establishes when to use it for a project-wide criticality and deadline assessment. The explicit condition "For the effect of one specific delay" routes that case to planitude_delay_impact instead, providing a concrete alternative rather than leaving selection to inference.

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