snapshot_changelog

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

With no annotations provided, the description carries the behavioral disclosure burden. It discloses the core behavior: it reads local snapshots, orders them chronologically, computes changes between consecutive ones, and produces a changelog. However, it does not state whether the operation is read-only, what happens when zero or one snapshot exists, or how the output differs across the three response_format values. These are meaningful gaps.

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 well-formed sentence that front-loads the verb and object, then adds the key processing detail. Every phrase earns its place, and it is not bloated. Slight deduction for not using a second sentence to add a usage hint or alternative routing, but the sentence as written is tight and clear.

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 sits in a very crowded snapshot family (playlist_changelog, diff_playlist_snapshots, snapshot_diff_summary, playlist_history, read_playlist_snapshot, etc.), has no annotations, no output schema, and a three-way response format switch. The description explains the algorithm but is incomplete for tool selection and invocation: it does not distinguish itself from similarly named siblings, does not state prerequisites (snapshots must pre-exist), and does not describe what each response_format actually returns. An agent would have to guess or test.

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 100%, so the baseline is 3. The description adds context around the overall purpose (which explains why the playlist parameter matters) but does not add meaning beyond what the schema already says for max_results or response_format. The schema already documents the default and enum values, so the description contributes no extra semantic value.

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 states a specific verb ('Build'), a clear resource ('chronological changelog of a playlist'), and a distinctive behavior ('from every local snapshot, describing the changes between consecutive snapshots'). It is easy to distinguish from sibling tools like diff_playlist_snapshots, which requires naming two specific snapshots, or playlist_diff, which likely compares two playlists rather than aggregating all snapshots.

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 implies the use case: you want a history of playlist changes built from locally stored snapshots. However, it does not explicitly state when to use this over the many snapshot siblings (e.g., playlist_changelog, snapshot_diff_summary, diff_playlist_snapshots), nor does it state prerequisites such as 'snapshots must already exist' or 'use snapshot_playlist first.' This is a meaningful gap given how crowded the sibling set is.

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