trmnl_get_mashup_timeline

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

Annotations already declare readOnly/idempotent/openWorld, so the bar is lower, yet the description adds genuinely non-obvious semantics: that today's entries are 'expected' rather than 'recorded', and that each entry names its device. It does not cover auth needs, limits, or the response envelope.

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 action, then the payload semantics. The trailing 'TRMNL GET /api/mashups/{mashup_id}/timeline' line is low value for an agent but is short and harmless.

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 no output schema, the description must convey return shape and does so partially (check-ins with device names, recorded vs expected). It leaves the response structure, pagination, and empty/missing-mashup behavior unaddressed.

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 low (33%), but the schema itself does describe all three inputs, including the ISO 8601 date defaulting to today in the owner's time zone and the profile default. The description only contributes the 'one day' framing, adding little beyond the structured fields.

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 ('Read a mashup timeline') and explains the content precisely: one day of a mashup across every device showing it, with recorded vs. expected check-ins. It implicitly separates itself from trmnl_get_device_timeline by scoping to a mashup across devices, but never names that sibling explicitly.

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 implied by the content description (a per-day view of a mashup's check-in history), but there is no explicit when-to-use/when-not statement and no named alternative such as trmnl_get_mashup or trmnl_get_device_timeline for an agent weighing options.

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