Conciseness

The body is dense and code-heavy, and XVCL syntax is genuinely out-of-training-data so directive explanations earn their tokens. However, the prefer-tables-over-if-chains guidance is stated three times (in 'Tables with Loops' twice and again in 'Common Mistakes'), and the 'Trigger and scope' section restates frontmatter content. This matches the 4 anchor ('efficient; minor instances of over-explanation that could be trimmed') rather than 5 ('every token earns its place').

Actionability

Fully executable throughout: copy-paste compile/lint/simulate commands with a curl test, a complete minimal working example, per-directive syntax blocks, and a compilation options table. This matches the 5 anchor ('fully executable; copy-paste ready code or commands; specific examples cover the common cases') — no pseudocode and no missing key details.

Workflow Clarity

The write → compile (`uvx xvcl`) → lint (`falco lint`) → simulate (`falco simulate`) → curl sequence is clear with most checkpoints present, plus useful guardrails ('Linting alone does not execute the VCL', backend naming rules). It falls short of 5 because there is no explicit fix-and-retry loop when compilation or linting fails. No destructive/batch operations, so the workflow cap at 3 does not apply.

Progressive Disclosure

The body is a genuine overview: directive syntax is summarized inline with complete detail pushed to references/xvcl-directives.md, and a 10-row references table with a 'Use when...' column provides well-signaled, one-level-deep navigation (all files verified to exist, flat in references/). This matches the 5 anchor ('clear overview with well-signaled one-level-deep references; easy navigation').

Specificity

Lists multiple concrete capabilities — 'loops, functions, constants, macros, conditionals, and includes', 'compiles .xvcl files into standard VCL' — with comprehensive coverage of the transpiler's feature surface in third-person voice. This matches the 5 anchor ('lists multiple specific concrete actions; comprehensive coverage') rather than 4, since no significant capability area is missing.

Completeness

Explicitly answers both questions: what ('Extends Fastly VCL with... a VCL transpiler that compiles .xvcl files into standard VCL') and when ('Use when writing VCL for Fastly, working with .xvcl files, generating repetitive VCL...'). This matches the 5 anchor exactly — clear what AND when with concrete trigger phrases; not 4 since the 'when' clause leaves nothing implicit.

Trigger Term Quality

Covers natural user phrasing and synonyms comprehensively: 'writing VCL for Fastly', '.xvcl files', 'multiple backends, routing rules, headers', 'reusable VCL functions', 'compile with `uvx xvcl`, test with falco', 'reducing VCL code duplication', 'modular includes'. Includes the file extension and both natural and technical terms, matching the 5 anchor; no common variation a user would say is absent.

Distinctiveness Conflict Risk

The XVCL/Fastly-VCL transpiler niche is distinct with dedicated triggers, but 'doing any VCL development task for Fastly — even without explicitly mentioning XVCL' deliberately broadens the scope, creating minor overlap risk with a hypothetical plain-Fastly-VCL skill. This sits between the 4 anchor ('mostly distinct; minor overlap risk') and 5 ('clear niche... minimal conflict risk') — noticeably above midpoint but the catch-all phrasing keeps it from a clean 5.