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 the auth gate ('needs kunci') and the audience (the owner), and the schema adds that bad keys are refused and logged. It does not state whether the reply is delivered immediately, whether it fails if no conversation exists, or what a success response returns — meaningful gaps for a mutation tool.

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 short clauses, no filler, and the audience restriction is front-loaded. Slightly too terse for a mutation tool, but nothing is wasted.

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 an unannotated mutation tool with no output schema and half-documented parameters, the definition leaves out what the reply actually does (where it lands, whether it needs a prior conversation, failure modes). The access restriction is covered, but the operational picture is not.

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 50%: 'kunci' is well documented in the schema, but 'teks' has no description anywhere. The description adds nothing about either parameter, so the payload content, length limits, or formatting expectations for the reply text are undocumented in both places.

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: 'Reply to the owner in the TerTau chat.' That is clearer than the sibling names tertau_tulis / tertau_baca, since 'reply to the owner' implies an outbound message in an existing conversation. It does not explicitly contrast with tertau_tulis, so differentiation is only partial.

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?

'OCKLU internal: TerTau agent only (needs kunci)' tells the agent who may call it and what credential is required, which is real usage guidance. It never says when to choose this over tertau_tulis for outbound messages, so the alternative-selection question is left implicit.

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