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

Beyond the annotations (readOnly=false, destructive=false, idempotent=false), the description discloses the approval workflow for acts assigned to others ('nobody is bound until they accept'), role-holder notification behaviour, and the caller membership prerequisite. These are non-obvious behavioural details not derivable from the structured fields.

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 with purpose then bulleted decision shapes, which is well structured. The framing sentence ('Whenever the user wants something new to happen...') and the trailing docs link are mild padding, but nothing is genuinely wasteful for a 10-parameter tool with multiple modes.

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, a 10-parameter mutation tool is fully covered: prerequisite membership, required project ID, the two assignment modes, approval semantics, and a docs link. An agent has everything needed to choose and invoke it.

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%, so the baseline is 3, but the description adds relational meaning the schema only partly encodes: which parameter set belongs to which mode (missionId paired with assignedUserId; tafkidims as the no-assignee path), and how getMemberMissionsTool / getProjectMembersTool resolve the IDs. It stops short of format details beyond the schema.

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 - create a task in a project - and immediately scopes what a task is ('the way a member gets something new done'). It explicitly contrasts itself with prepareMissionTool, so an agent can route between them without opening either schema.

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?

Gives three explicit decision branches (existing mission -> create act linked to it; nobody does this kind of work -> use prepareMissionTool instead; no specific person -> create unassigned with tafkidims). When-not-to-use is stated as directly as when-to-use, with the named alternative tool.

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