diff_snapshots_tool

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

With no annotations, the description carries the full burden and does disclose key behavior: "Side effects: none; no socket call is made" and the edge case that lists are compared by position, not identity. These are genuinely useful traits not derivable from the schema. Return-format detail is thin, though the output schema covers that.

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?

Front-loaded with the core action, then labeled subsections (side effects, example, edge cases). It is efficient, though the fragmented "Example:/Edge cases:" labeling is slightly choppier than a flowing sentence would be.

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 described, and the description still adds the changed-paths behavior. Combined with the explicit side-effect and comparison-semantics notes, this is nearly complete; only the upstream relationship to take_snapshot is left implicit.

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 0%, so the description must compensate. The example ``diff_snapshots_tool(old, new)`` hints at ordering (old vs new) and the params are clearly two snapshots, but the description does not define what a "snapshot" object should contain or how the two args differ. It partially compensates but leaves the parameter meaning under-specified.

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 snapshots") plus the scope qualifier "on the MCP-server side," and the example clarifies it "reports changed paths." It does not explicitly distinguish itself from the related take_snapshot sibling, so it falls short of the top mark.

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?

Usage is only implied: the agent can infer this runs over snapshots (presumably from take_snapshot), but no when-to-use, prerequisites, or named alternatives are given. The example supplies a calling pattern rather than guidance on when this tool is the right choice.

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