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

Annotations already declare this as a non-read-only, non-idempotent, non-destructive write. The description goes beyond that with genuinely useful behavior: the output is a link, that link expires after 30 days, and the user must open it to save or share the chart. Remaining gaps are auth/permission requirements and what happens on partial or duplicate data.

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?

Three short sentences with the core action front-loaded and no filler. The 'Up to 500 people' sentence duplicates the schema maxItems, which is the only redundancy.

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?

With no output schema, the description correctly compensates by describing the return value (a 30-day editor link) and the post-open workflow. For a single-parameter create tool this covers what an agent needs, missing only permission/auth context.

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 the nested items schema already documents id, name, title, department, reports_to, and also_reports_to in depth. The description only restates the array ('from a list of people', 'Up to 500 people'), adding no meaning beyond the schema, so the 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?

Specific verb+resource ('Create an org chart') plus the resulting artifact (a link that opens in the SimplOrg editor), so an agent knows exactly what this produces. It does not explicitly distinguish itself from the sibling read_org_chart, which is the only thing keeping it off a 5.

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?

Usage is implied by the name and the create/link framing, and the 500-person limit gives a rough scope boundary. However, there is no statement of when to choose this over read_org_chart, no prerequisites, and no error or failure conditions.

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