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

No annotations are provided, so the description carries the full burden. It discloses meaningful behavior: enabling the first challenger opts the config into Proof-Me, telegram captures chat_id later, whatsapp must pre-declare phone, and the tool requires a Proof account. It does not describe the return value or whether the operation is reversible, but the core side-effects are clearly stated.

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?

The description is compact and front-loaded with the core purpose, followed by channel-specific notes and an explicit usage workflow. Each sentence earns its place. Minor redundancy with the schema (the whatsapp phone requirement is also in the schema) but the additional context justifies it.

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?

Given the tool has no output schema and no annotations, the description provides the needed context: what the tool does, when to call it, what happens on first enrollment, channel nuances, and authentication requirements. The missing return-value description is a minor gap, but the operational context is strong enough for correct invocation.

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 4 parameters. The description adds value by explaining the telegram vs whatsapp difference and the whatsapp phone requirement beyond the schema's simple field descriptions. This goes beyond baseline without fully detailing formats or constraints already in 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?

The description states a specific verb (pre-enroll), a specific resource (a Proof-Me challenger on a HITL config), and explains special behavior (first challenger opts the config into Proof-Me; telegram vs whatsapp enrollment differences). This clearly distinguishes the tool from siblings like invite_challenger, list_challengers, and remove_challenger.

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 gives an explicit agent-usage workflow: after adding a challenger, call invite_challenger to mint the enrollment link. It also provides an authentication directive and a negative hint (start_login does NOT open this tool), which helps the agent know when and how to use it.

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