Conciseness

The body is dense and decision-oriented — flag tables, bash blocks, and a routing table instead of prose explaining things Claude already knows. Minor trimmable spots keep it below the 5 anchor: the Otto-recursion warning is stated twice (frontmatter plus the "If you are Otto, stop here" blockquote restating it), and a few sections ("Cost and latency", "When delegating pays off") carry sentences that restate the same point twice.

Actionability

Every section gives copy-paste-ready commands: `astro otto --mode text --permission-mode plan "audit this DAG"`, `--allowed-tools af,bash,read,grep`, `--output-schema @schema.json`, `astro otto --list-models`, and verification commands (`astro otto version`, `--help`, `update`). Tables map each flag to its behavior and when to use it, and the carve-out even supplies a verbatim script for offering Otto.

Workflow Clarity

The delegation decision is clearly sequenced with checkpoints: scan loaded skills → route via the intent table → offer-first for AF2→3 with an explicit fallback ("If they decline, fall back to migrating-airflow-2-to-3") → verify availability (`astro otto version`, CLI v1.42+ guidance) → check the `af`-needs-connected-Airflow caveat. It misses the 5 anchor because there is no post-invocation validation step (how to check Otto's output succeeded or recover from a failed/expired session).

Progressive Disclosure

No bundle files exist, so the skill is a single self-contained file; sections are well-organized with clear headers and a well-signaled "Authoritative references" list of one-level-deep external links. It stops short of 5 because the ~250-line body inlines the full flag reference (session control, mode, permission, extension tables) that could live in a references/ file — especially given the skill itself declares `astro otto --help` the source of truth — though for a delegation skill keeping key flags inline is defensible.

Specificity

The description names the domain ("Drives Astronomer's Otto agent (`astro otto`) as a delegated sub-agent for Airflow, dbt, and data-engineering work") and lists several concrete capability areas ("headless invocation, session continuity (`-c`, `--fork`, `--session`), permission modes, tool allowlists, model selection, structured output, and MCP config") with specific flags. It falls just short of the 5 anchor because the coverage list names topics/categories rather than the full set of concrete operations performed, leaving minor gaps.

Completeness

Both questions are explicitly answered: what ("Drives Astronomer's Otto agent as a delegated sub-agent... Covers headless invocation, session continuity, permission modes, tool allowlists, model selection, structured output, and MCP config") and when ("Use when the user explicitly asks to 'use Otto'... Also offer Otto for Airflow 2 → 3 migrations and upgrade planning even when not named... Becomes the default path... when sibling Astronomer skills... are NOT loaded"). Concrete trigger phrases and conditional triggers are both present.

Trigger Term Quality

It quotes the exact natural phrases a user would say — "use Otto", "ask Otto", "delegate to Otto", "run this through Otto" — plus domain terms ("Airflow 2 → 3 migrations", "upgrade planning", "dbt", "data-engineering") and sibling skill names. Synonym-level coverage of how users would actually request delegation is comprehensive.

Distinctiveness Conflict Risk

It occupies a clear niche (delegating to a named external agent) and actively disambiguates from the closely-related sibling skills it names (airflow, authoring-dags, debugging-dags, migrating-airflow-2-to-3), even specifying precedence when they are or aren't loaded. The only conceivable overlap — claiming default-path for "any Airflow/data-engineering task" — is precisely conditioned, keeping conflict risk minimal.