sort_playlist_apply

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

With no annotations provided, the description carries the full burden and discharges it excellently: it discloses that this is a mutating operation, that a local backup is created first, that the rewrite is a single atomic replace, that dry-run previews without changing anything, and even the quota cost (1 GET + 1 local write + 1 PUT). This is exactly the behavioral context an agent needs to safely invoke a mutation tool.

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?

Three dense sentences, zero filler: purpose and safety behavior first, then mode semantics, then quota cost. The most decision-relevant information (it's an in-place mutation with a safety backup) is front-loaded before operational details.

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 mutation tool with no annotations and no output schema, the description covers the essential contract: what changes, how it protects against data loss (backup + atomic replace), how to preview safely, and the cost. It leaves return-value details to the schema's PLAN mention and doesn't clarify edge behavior around max_results, but nothing critical to calling it safely is missing.

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's sort-key list maps onto the sort_by enum and 'release era' helpfully aligns with the release_date value, but the schema already documents all parameters thoroughly; the dry_run restatement adds minimal value beyond the schema's own detailed description.

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 precise action ('Sort a playlist in place') with an explicit list of sort keys (name, artist, album, duration, added-at date, release era). The 'in place' scoping plus the backup-then-atomic-replace detail clearly distinguishes it from plan-only siblings like sort_playlist_plan and simpler utilities like playlist_sort.

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 clear internal mode guidance ('dry_run=true (default) previews only'), implying a preview-then-commit workflow. However, it never explicitly routes the agent between this tool and the closely related sort_playlist_plan sibling, nor states when committing is appropriate versus when a plan-only tool should be used.

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