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

Goes well past the annotations, which only declare that this is a non-idempotent, non-destructive write. It discloses async behaviour and rough latency ("about a minute for a large workbook"), where the import report lands (`FINANCE.md`/`has_finance_md`), that a failed import deletes the model, that connector credentials are excluded from template copies, that the source template is unchanged, and that undated period headers raise `IMPORT_DECISION_REQUIRED` with `anchors`.

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 lead sentence front-loads the verb and return value, and nearly every clause carries new information for an 8-parameter, three-mode tool. It is, however, a single dense run-on paragraph with heavy parenthetical nesting, which makes it harder to scan than a few short mode-oriented sentences would be.

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 carries the return-value burden itself and does so: the standard response shape, the special `file_id` shape (`{ model_id, name, status: "importing" }` plus `guidance`), the deferred report location, and the failure/rollback path. Nothing an agent needs to invoke this correctly on a nested-object tool appears absent.

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 63%, and the description compensates well: it explains the `workspace_id` default, the copy semantics of `template_id`, that `timelines` creates only the grains supplied ("`{ monthly }` alone gives a monthly-only model"), and the `anchors`/`IMPORT_DECISION_REQUIRED` loop. `subtitle` goes unexplained in both schema and description, and the glyph examples largely repeat the schema's own examples, so it stops short of a 5.

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?

Opens with a specific verb+resource ("Creates a model and returns its detail with its UUID") and then delineates the three creation paths — blank, `template_id` copy, `file_id` import — so an agent can tell which mode it needs without opening the schema. It also names concrete siblings it interacts with (`layerz_create_upload_url`, `layerz_diff`, `layerz_get_conventions`), which anchors it in the catalog.

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 conditions are explicit for each mode: `template_id` for copying a template, `file_id` "instead" for workbook import, `timelines` for grain scoping, plus availability guidance ("Not advertised to model-scoped or read-only keys") and the plan model cap. What is missing is routing against near-neighbours like `layerz_build_from_blueprint` — the description never says when to prefer that over this tool.

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