Conciseness

The body is dense with Trellis-specific facts Claude cannot know (paths, commands, config keys) and never pads with explanations of known concepts. Minor tightening is possible: the "do not default to the global npm install directory" warning appears in both prose (line 20) and the Do Not section (line 80), and the v0.6 paragraph packs three architectural surfaces into one overloaded sentence — matching 'efficient; minor instances that could be trimmed' rather than the fully lean level-5 anchor.

Actionability

Concrete, executable commands appear throughout: "trellis workflow --template <id>", "task.py create --parent <slug>", "trellis channel spawn --agent <name>", "trellis mem list | search | context | extract", plus exact file paths and config keys (channel.worker_guard.idle_timeout, codex.dispatch_mode: inline | sub-agent). For an instruction-only skill the guidance is specific and actionable, but it stops short of copy-paste-ready edit examples for the common customization cases, keeping it just below the fully executable level-5 anchor.

Workflow Clarity

The "How To Use" section gives a clear 5-step conditional routing sequence (overview first, then platform-specific, multi-agent, or customization references), ending with a validation gate ("read the actual files in the user project and treat local content as authoritative"). Additional checkpoints exist (check .trellis/.template-hashes.json before overwrites; cross-check trellis --help before claiming a knob exists), but there is no explicit error-recovery/feedback loop for when a step fails, which fits 'clear sequence with most checkpoints present; minor validation gaps'.

Progressive Disclosure

The body is a well-organized overview: a guided reading order, an annotated index of 23 one-level-deep reference files (all verified to exist under references/local-architecture/, references/platform-files/, and references/customize-local/), grouped by topic with one-line descriptions, plus concise current-rules and do-not sections. This matches the level-5 anchor of a clear overview with well-signaled one-level-deep references and easy navigation.

Specificity

"Understand and customize the local Trellis architecture" gives two concrete verbs applied to an exhaustive, specific enumeration of targets ("modifying .trellis plus platform hooks, settings, agents, skills, commands, prompts, workflows, the channel runtime (trellis channel), bundled runtime agents under .trellis/agents/..."). Coverage of surfaces is comprehensive but the action vocabulary itself is thin (only understand/modify), which keeps it just below the level-5 anchor of multiple specific concrete actions.

Completeness

Explicitly answers both questions: what ("Understand and customize the local Trellis architecture inside a user project") and when ("Use when modifying .trellis plus platform hooks, settings, agents, skills, commands, prompts, workflows..."). The 'when' clause is explicit, detailed, and lists concrete trigger surfaces, matching the level-5 anchor exactly; the missing-'Use when' cap does not apply.

Trigger Term Quality

Strong natural keywords a Trellis user would say: ".trellis", "trellis channel", "trellis mem", "trellis init", "hooks", "settings", "agents", "workflow templates". A few natural phrasings are missing (e.g. "customize Trellis", "trellis config", specific platform directory names like .claude/.codex), so it sits between good (4) and comprehensive (5) keyword coverage.

Distinctiveness Conflict Risk

Trellis-specific anchors (.trellis, trellis channel, trellis mem, bundled skills) give it a clear niche with minimal conflict against unrelated skills. However, generic trigger nouns like "platform hooks, settings, agents, skills, commands, prompts, workflows" create minor overlap risk with a generic platform-configuration skill, so it fits 'mostly distinct; minor overlap risk' rather than the level-5 anchor.