Conciseness

Mostly efficient runbook prose with no padding about concepts Claude already knows, but it repeats its own material: the misspelled alias paths appear in Workflow step 1, Anti-Patterns, and Gotchas; the $CODEX_HOME vs repo-local distinction is restated four times; cache-invalidation warnings recur across four sections. Meta lines ("Use strict skill audit and Plugin Eval when changing this skill", "Apply the context-disposition policy") and time-sensitive "current ~/dev/codex" statements add tokens without operator value and are not isolated in a deprecated section, fitting anchor 3 rather than 4.

Actionability

Concrete, specific guidance throughout: exact paths (`.codex/environments/environment.toml`, `$CODEX_HOME/environments.toml`), preferred wrapper commands (`./bin/ask`, `make`, `pnpm`, `uv`, `cargo`), and a precise create/triage/update mode taxonomy. It stops short of anchor 5 because the body contains no copy-paste TOML shapes or exact validator commands (e.g. a tomllib one-liner), deferring those to references — a minor gap for an instruction-only runbook.

Workflow Clarity

The 10-step Workflow is clearly sequenced with an explicit validation step ("Validate with the smallest real check... Report exact pass, fail, or blocked outcomes"), a fail-fast feedback loop ("Fail fast at the first failed gate; fix and rerun before claiming completion"), and error-recovery guidance in Failure Mode ("separate pre-existing repo failure from the environment-file change and rerun only after a targeted fix"). This matches anchor 5: explicit validation, feedback loops, and itemized triage checklists.

Progressive Disclosure

The body serves as the overview and all five referenced files exist, are exactly one level deep, and each is signaled with an explicit purpose: contract.yaml and evals.yaml for machine-readable contract/benchmark coverage, task-profile.json for evaluator thresholds, and "Read when" conditions for environment-authoring.md and provider-examples.md. This matches anchor 5's clear overview with well-signaled one-level-deep references.

Specificity

Names the artifact (environment TOML) and three concrete operations ("created, triaged, or updated"), plus covered areas ("safe setup, actions, exec-server providers, and validation evidence"). The trailing list reads as compressed coverage categories rather than fully distinct concrete actions, so it falls just short of the comprehensive anchor 5.

Completeness

Both parts are present: what ("environment TOML created, triaged, or updated with safe setup, actions, exec-server providers") and an explicit when ("Use when a project or Codex runtime needs..."). The when clause is abstract — it names conditions rather than concrete user-mentionable trigger phrases (e.g. "when the user mentions environment.toml or Codex setup"), so it fits anchor 4, not 5.

Trigger Term Quality

"Codex", "environment TOML", "setup", and "triaged" are natural terms a user might say. However the concrete filename triggers users actually produce — "environment.toml", the common "environmental.toml" misspelling the skill itself documents, and ".codex/environments" — are missing, matching anchor 4 (good coverage, a few natural terms missing) rather than 5.

Distinctiveness Conflict Risk

"Codex runtime" and "exec-server providers" carve a clear niche that would rarely trigger for unrelated skills. Minor overlap remains with closely related skills (the referenced [[toml]] and [[bootstrap]] skills, generic environment/setup tooling), and "environment TOML" without the .codex path could tug at broader config-file skills — anchor 4 rather than 5.