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

Adds real behavioral context beyond the annotations: absent fields are left untouched, explicit `null` clears fields where allowed, and `kind` is irreversible once set (and must not be set on the General project). It also discloses the fallback behavior for workspaceId/teamId and that the response reports which workspace was used. Not stated: permission requirements or what the update overwrites on failure.

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?

Front-loaded correctly: create-vs-update routing first, create requirements second, update field catalog third, with workspace/team fallbacks last. It is dense and repeats enum values already present in the schema, but the length is defensible for an 18-parameter tool.

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?

Covers the create path, the update path, field-clearing semantics, supporting lookup tools, and the fallback/response behavior for workspace and team, which is essentially everything needed to call it correctly. Gaps are minor: no error/permission behavior and no guidance on ordering or required state before update.

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?

With 0% schema description coverage across 18 parameters, the description carries the full burden and does so — it defines date format (epoch ms), color format (hex #rrggbb, null = neutral), icon format (emoji or 'lucide:Name'), the groupBy options, the null-vs-absent clearing contract, and the permanence of `kind`. Only the contents of propertyOrder/visibleColumns arrays remain loosely specified.

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?

Opens with a specific verb+resource pair and immediately splits the two modes: create without `id`, update with `id`. The field list and the `kind` distinction make it unambiguous against siblings like save_issue or save_project_label.

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?

Explicitly routes the agent to `list_projects` to obtain the id, `list_members` for leadId, and `list_project_labels` for projectLabelId, plus states create-vs-update selection via presence of `id`. It stops short of saying when *not* to use this tool (e.g. label/team creation), but the prerequisites are unusually well covered.

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