kb_update_index_md

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

With no annotations, the description carries the burden and does add real value: it discloses the atomic write strategy (temp file + rename) and the failure characteristic (no truncated index on interruption). It stops short of saying whether manually edited content in INDEX.md is overwritten, which matters for a regenerating write.

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 sentences, zero filler, and the primary action is front-loaded in the first clause. The atomicity note is the only secondary detail and it is genuinely useful.

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 zero-parameter tool with an output schema, the description covers the action, its redundancy with automatic refresh, and write safety. The remaining gap is the relationship to kb_reindex and whether existing INDEX.md content is replaced wholesale.

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 tool takes zero parameters, so there is nothing to disambiguate and the baseline of 4 applies. The description correctly spends no words on parameter semantics.

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: regenerate the root INDEX.md. An agent knows exactly what file is affected. It does not, however, differentiate itself from the sibling kb_reindex, leaving a small ambiguity about which one rebuilds what.

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 parenthetical '(it also refreshes automatically)' implies this call is usually unnecessary unless the caller needs the update immediately, which is useful implied guidance. But there is no explicit when-to-use rule and no mention of when kb_reindex would be the right alternative.

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