reaches

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

There are no annotations, so the description carries the full behavioral burden. It does disclose that the result is a labeled witness path or negative answer and that src/sink can be node ids or names, which gives useful expectations. However, it does not describe ambiguity handling, path format details, or what exactly constitutes the negative answer, so behavioral coverage is solid but incomplete.

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-loads the core behavior in the first sentence. The second sentence clarifies the result, and the third clarifies accepted input forms. Every sentence earns its place with no filler or schema repetition.

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 tool with no output schema and no annotations, this description gives the essential: what it computes, what it returns, and accepted input forms. However, it omits potential constraints such as whether the graph must be loaded first, how names are resolved, and how to disambiguate multiple matches, leaving moderate ambiguity for an agent.

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?

With only 33% schema_description_coverage, the description compensates for the bare 'src' and 'sink' definitions by stating that both may be node ids or names. The 'format' parameter is already documented by the schema enum, so the description provides meaningful extra meaning where it is most needed.

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 clearly states the operation: asking whether src reaches sink through value flow, and it indicates the useful outcome of a labeled witness path or negative answer. It is specific enough, though it does not explicitly distinguish itself from similar sibling tools like 'flow' or 'taint'.

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?

No guidance is given about when to use this tool versus alternatives. The 'Does src reach sink...' phrasing implies a reachability query, but there is no mention of prerequisites, exclusions, or how this compares to the many related sibling graph/flow tools.

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