react_timeline_sequence_match_beat

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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds one behavioural detail: variable clocks are resolved through actual beat anchors rather than a computed grid, which explains accuracy characteristics. It says nothing about tolerance handling, rounding, or failure when a time falls outside the clock range.

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?

A single compact sentence with no filler, and the core operation is front-loaded. It is arguably over-compressed for a nested oneOf schema, but no wording is wasted.

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?

With a nested two-mode clock union, tolerance parameter, and no parameter descriptions, the description is far too thin for the tool's complexity, even though an output schema exists to cover return values. An agent could not reliably construct the variable clock payload or interpret tolerance_seconds from this text.

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% over a deeply nested schema with two alternative clock shapes, so the description carries the full burden and mostly does not. It gestures at the variable clock's beats/origin data but explains nothing about seconds (the source time), tolerance_seconds, offsetPips, firstBeatSeconds, or pips_per_beat=64, nor that the fixed and variable modes are mutually exclusive.

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 gives a verb-plus-object ('Match a source time to the upstream clock'), so the general purpose is inferable, but it never distinguishes this from the closely related siblings validate_beat_clock, sample_beat_clock, and beat_grid, all of which involve the same beat-clock domain. An agent cannot tell from the text alone which of the four to pick.

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 only guidance is the clause 'variable clocks use actual beat anchors', which hints that the variable clock mode is handled differently but never states when to call this tool versus sample_beat_clock or beat_grid. There are no exclusions, no prerequisites, and no mention of when the fixed mode should be supplied.

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