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

With no annotations, the description must carry the full behavioral burden. It usefully discloses the four analysis dimensions it reports on, implying a non-destructive read comparison, but it never states read-only status, whether inputs must be valid/compilable programs, what happens on parse errors, or the shape of the result.

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 tight sentences, front-loaded with the verb and the analytical question it answers. The rhetorical question format efficiently conveys the diff dimensions without padding, and the usage cue trails as a short second sentence.

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, the enumerated check categories effectively preview the return content, which is a strength. But the undocumented host parameter and the absence of input format expectations leave the definition short of what an agent needs to invoke it reliably.

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 description coverage is 0% across three required parameters, so the description must compensate. It implicitly maps old_program/new_program to the two compared versions, but the required "host" parameter is never explained, nor is the expected format of a program string, leaving a real 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?

States a specific verb and resource ("Compare two versions of a program") and enumerates exactly what the comparison surfaces: resource gains, higher worst-case calls/cost, new tagged data flows, new approval sites. That is far more specific than the name alone, though it does not explicitly differentiate itself from siblings like remit_check or remit_run_fixtures.

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?

"Use this after editing a program" gives a clear timing cue for invocation, which is genuinely useful context. However there is no guidance on when NOT to use it, no mention of alternatives (e.g., remit_check for validation), and no prerequisites stated.

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