diff_since_snapshot

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

With no annotations, the description carries the full burden of disclosing behavior. It only states the comparison action and does not mention whether the operation is read-only, what the result looks like, whether it fetches live data, or how it handles missing/stale snapshots. This is a meaningful gap for a tool that accesses stored state.

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 a single, efficient sentence with no filler. It front-loads the verb and resource immediately, making it easy to scan and understand.

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?

The tool has no output schema, so the description should clarify what the tool returns, but it does not. It also lacks guidance on distinguishing this tool from several closely related snapshot-diff tools. For a simple tool this is close to minimal viability, but the missing return-value semantics and sibling differentiation leave it incomplete.

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 input schema fully documents both parameters, so the baseline is 3. The description adds little beyond the schema, but the parameter names and schema descriptions ('Playlist ID', 'Snapshot ID to compare against') are sufficient for an agent to understand the required inputs.

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 identifies the action ('Compare') and the resources ('current playlist state' vs 'stored snapshot'), making the tool's core purpose understandable. It does not explicitly name or distinguish from nearby siblings such as diff_playlist_snapshots or playlist_diff, but the phrase 'current playlist state' provides meaningful differentiation.

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 description gives no explicit guidance on when to use this tool versus alternatives, nor does it mention prerequisites like needing a snapshot to already exist. Among the many snapshot-related siblings, there is no routing information to help an agent choose this tool over diff_playlist_snapshots, snapshot_changelog, or find_new_since_snapshot.

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