Conciseness

The body is a wall of dense multi-clause paragraphs — e.g., the parseDates paragraph enumerates 'PST is -08:00 all year; ambiguous ones such as BST, IST and CST are rejected; PST/CDT follow US usage, so for Philippine time (PST) or Cuban daylight time (CDT) give an IANA name', and the Astra Session section runs 26 lines of unbroken prose. The facts are package-specific (not general knowledge), but the inlined edge-case detail is far beyond what a SKILL.md needs, matching anchor 2 (noticeably verbose, several padded sections) rather than anchor 3's 'mostly efficient, some tightening'.

Actionability

There is one runnable snippet ('program := ax.NewAx(...)' / 'program.Forward(...)') plus concrete signatures ('func(key string, value map[string]Value) (map[string]Value, error)', 'iter.Seq2[AxGenDelta, error]', 'AddFieldProcessor(field, processor)'), but nearly every other feature — multi-sampling, result pickers, tools, MCP, cancellation — is described semantically with no executable example, leaving key usage details missing. That sits at anchor 3 (some concrete guidance but incomplete), below anchor 4's mostly-executable bar.

Workflow Clarity

A rough sequence is implied by the guardrails ('Start from package examples for exact native syntax before inventing a new call shape', 'Use `no-key` examples for deterministic local checks'), which doubles as an implicit validation checkpoint, but no explicit ordered steps or checkpoints are stated anywhere — anchor 3 (sequence present but implicit, checkpoints missing). The destructive/batch cap does not apply since this is a code-writing skill.

Progressive Disclosure

The 'Package Facts' section does clearly signal external material ('Package API docs: `API.md` and `axir-api.json`', 'Runnable examples: `examples/`'), but roughly 80 lines of per-option behavioral semantics (Astra Session Work, Provider Forward Options) are inlined into SKILL.md where they clearly belong in separate reference files, and no bundle reference files ship alongside — anchor 2 (content that clearly belongs in separate files is inlined) fits better than anchor 3's 'references not clearly signaled'.

Specificity

The description enumerates ten concrete capability areas — 'AxGen programs, forward calls, indexed multi-sampling, result pickers, streaming, tools, assertions, traces, usage, and output parsing' — but they are stated as feature nouns rather than concrete actions (only the verb 'writing' appears), so it matches anchor 4 (several specific items, minor gaps) rather than anchor 5's fully action-verb coverage.

Completeness

'Use when writing Go code with `github.com/ax-llm/ax/packages/go`' is an explicit, concrete 'when' clause, and the 'what' is the enumerated capability list that follows — both what and when are clearly and explicitly answered with concrete trigger phrases, matching anchor 5. Anchor 4's weakness ('when' could be more explicit) does not apply.

Trigger Term Quality

Phrases like 'writing Go code', 'AxGen', 'forward calls', 'streaming', 'tools', and 'output parsing' are terms a user of this package would naturally say, giving good keyword coverage; a few natural variants are missing (e.g., 'Golang', 'structured output', 'LLM generation'), which keeps it below anchor 5 and comfortably above anchor 3.

Distinctiveness Conflict Risk

Naming the exact Go package path 'github.com/ax-llm/ax/packages/go' and the AxGen-specific feature vocabulary ('forward calls', 'result pickers') carves out a clear niche with minimal overlap risk against generic Go, LLM, or tooling skills.