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

With no annotations, the description covers required authentication and the side effect of disabling Proof-Me when removing the last challenger, which is useful. However, it doesn't mention whether removal is reversible, if there are cascading effects on other entities, or what the return value is. This is adequate but could be richer.

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?

Two sentences with no filler. The main action is front-loaded, and the critical side effect is immediately stated. The authentication note is placed after the action, making the most important information first.

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 simple two-parameter mutation with no output schema, the description covers the what, when, and the likely failure condition (auth). The only gap is the lack of behavioral details like idempotency or error cases, but given the tool's simplicity, this is nearly complete.

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 schema already describes both parameters with clear names and IDs. The description adds context about the 'hitl_id' referring to the config and the 'challenger_id' identifying the challenger, but this is minimal beyond the schema. 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?

The description states a specific verb ('Remove') and resource ('a Proof-Me challenger from a HITL config'), and distinguishes it from related tools like list_challengers, invite_challenger, and add_challenger. It also notes the consequence of removing the last challenger, making the purpose unambiguous.

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 clearly explains the prerequisite (needs a Proof account, authenticate) and explicitly states that start_login does not open this tool, preventing misuse. However, it does not explicitly compare with alternatives like remove_circle_member or update_hitl, so it's clear but not exhaustive.

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