complete_chain_link

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

Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the safety profile is externally supplied. The description adds only the side effect of recording deliverables and says nothing about what completion destroys or mutates, whether it advances the chain to the next link, or what happens to the handoff file, which is exactly the gap a destructive, idempotent mutation should address.

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?

A single compact sentence with the action and its side effect front-loaded and no filler. It is efficiently written, though its brevity is part of why the other dimensions are thin rather than a demonstration of disciplined scoping.

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?

An output schema exists so return values need not be explained, but for a destructive, non-read-only lifecycle mutation with undocumented parameters and a large family of chain siblings, the description leaves critical context missing: which link is affected by default, what completion implies for the chain's subsequent state, and how deliverables/handoff interact.

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?

The nested input object holds five meaningful fields (handoff, chain_id, link_number, deliverables, progress_markers) with a top-level schema description coverage reported at 0%, so the schema is not carrying this load. The description mentions only deliverables and omits the link_number default behavior and the handoff/progress_markers semantics, so it fails to compensate for the coverage gap.

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?

"Mark a chain link as complete, record deliverables" gives a specific verb (complete) and resource (chain link), plus a secondary effect (recording deliverables). It does not distinguish this from the closely named sibling complete_chain, which completes an entire chain rather than one link, leaving some ambiguity an agent must resolve by other means.

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?

There is no statement of when to use this tool versus complete_chain, add_chain_link, or set_chain_status, and no prerequisites or ordering guidance for the chain lifecycle. The agent must infer the intended call context entirely from the name.

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