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Scaffold and harden Surface — a deterministic
"documentation governed like code" gate. Surface anchors prose claims to code symbols, stores an
AST-normalized logic fingerprint per symbol, and blocks CI/commits when the fingerprint drifts
until a human re-runs surf verify. It ignores cosmetic edits and catches flipped operators,
relaxed comparisons, and dropped await.
⚠️ Experimental — adopt defensively. As of 2026-06 Surface is a young, single-maintainer
project (no crates.io publish, bus-factor 1). The engine and release hygiene vetted well, but
treat it as a pinned, optional gate — never an unpinned dependency. This skill defaults to
SHA-pinned installs and fail-closed checksum verification.
When to Use This Skill
Use this skill when...
Use another approach when...
Adding a deterministic doc↔code drift gate to CI/pre-commit
Enforcing same-commit doc discipline by convention (blueprint:blueprint-docs-currency)
You want specific prose claims pinned to specific functions
Detecting stale generated content (blueprint:blueprint-sync)
You want an offline, no-LLM gate that fails the build on logic drift
You want semantic "is the doc still true?" judgment (code-quality:code-review)
Hardening an existing Surface setup (pin by SHA, verify checksums)
Generating docs from code (documentation:docs-generate)
Context
surf.toml: !find . -maxdepth 2 -name 'surf.toml'
Hubs dir: !find . -maxdepth 2 -type d -name 'hubs'
--check-only: Report Surface adoption status and pin hygiene; make no changes (CI mode).
: Apply scaffolding and hardening without prompting.
--fix
--pin <tag>: Release tag to install/pin (default: latest stable; resolve its commit SHA before writing any uses: ref).
Execution
Execute this Surface configuration workflow:
Step 1: Detect current state
From Context, classify the repo:
Signal
Meaning
surf.toml present
Surface already initialised — go to hardening (Step 5)
Hubs dir present, no surf.toml
Partial setup — repair
Neither
Greenfield — full scaffold
Language marker
Surface supports Rust, TypeScript/JS (TSX grammar), Python, Go. Warn if none match — anchors only resolve in supported languages.
If --check-only, report the table and the pin audit from Step 5, then stop.
Step 2: Confirm the maturity trade-off
Before writing files, surface the experimental posture (the blockquote above) and confirm with
AskUserQuestion unless --fix is set: adopt as a pinned optional gate (recommended) or skip.
Record the chosen pin tag.
Step 3: Resolve the pinned ref
Resolve the chosen tag to the commit SHA it points at so every uses: and rev: is
reproducible — a release tag can be re-pointed to a different commit after the fact, so the SHA the
tag resolved to (with the tag kept in a trailing comment) is the real immutable anchor:
Land the Action ref as Connorrmcd6/surface@<sha> # <tag> and the pre-commit rev: as <tag>
(github-tags datasource — Renovate manages both; see .claude/rules/version-pinning.md). Do not
hand-transcribe a SHA from memory.
Carry the same tag into the Action step's version: input (Step 5) — the ref pins the action,
not the binary it installs.
Step 4: Scaffold (greenfield)
Create surf.toml:
hubs = ["hubs/*.md"]
Create hubs/ with one starter hub anchoring a real, stable symbol the team relies on. Hub shape:
---
summary: One-line description of what this hub governs.
anchors:
- claim: >
The prose claim about behaviour that must stay true.
at: src/path/file.ts > symbolName
hash: "" # surf verify seals this after you confirm the prose
refs: []
---
# Title
Longer explanation a reviewer reads when the gate flags drift.
Run surf lint (every anchor resolves to exactly one symbol), then surf verify to seal hashes.
Step 5: Wire + harden the gates
Pre-commit — add to .pre-commit-config.yaml (requires surf on PATH; pair with
/configure:web-session to install it in Claude Code web sessions):
-repo:https://github.com/Connorrmcd6/surfacerev:v0.8.0# --pin tag; Renovate-managed (github-tags)hooks:-id:surf-lint# anchors resolve-id:surf-check# the gate — blocks on drift
GitHub Action — scaffold .github/workflows/ with a SHA-pinned ref and an explicit
version::
name:"Docs: Surface drift gate"on: [pull_request]
jobs:surface:runs-on:ubuntu-lateststeps:-uses:actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8# v5.0.0-uses:Connorrmcd6/surface@091b937ae34ac81a02386604fed977dd24f1f0cf# v0.8.0with:version:v0.8.0# pins the BINARY; the input defaults to floating `latest`args:check
Two pins, not one. The @<sha> # vX.Y.Z ref pins the composite action and its bundled
install.sh; version: pins the binary that installer downloads. Omit it and action.yml's
own default (latest) resolves releases/latest over the API on every run — a new upstream
release then changes gate behaviour with no local change, landing as a red merge gate nobody can
attribute to an edit. Checksum verification does not close this: it proves the download matches
its own published hash, not that it is the version you pinned. Keep the two values equal;
Renovate bumps the ref, so update version: to match in the same PR.
The historical installer-pin gap (action.yml piping install.sh from mutable main) is fixed
and shipped — v0.8.0 runs sh "${{ github.action_path }}/install.sh". Pinning v0.6.2 or
earlier still carries that gap; vendor install.sh at that ref if you must stay there.
Step 6: Document the JSON → reviewer handoff
Surface keeps semantic judgment out of its deterministic core and emits JSON for reviewer plugins
(surf check --format json). Note in the repo (e.g. CONTRIBUTING or the workflow) that a drift
verdict can be handed to code-quality:code-review / verify to judge whether the claim is still
true before a human runs surf verify. That is the division of labour Surface is designed for and
where our skills add the most value.
Step 7: Report
Print: scaffold actions taken, the resolved pin (<sha> # <tag>), the version: input value, the
pre-commit + Action wiring status, and the hardening checklist below with each item ✓/✗.
Hardening checklist
Control
Target state
Action ref
SHA-pinned with # <tag> comment, not a floating major
Binary version
Pinned via version: <tag> in with:, not left at the floating latest default
Installer
Checksum-verified (default) or vendored at the pinned ref
Pin freshness
rev: / uses: Renovate-visible (github-tags shape)
Gate scope
surf check --base <ref> to diff-scope to changed files in CI
Report adoption + pin hygiene without modifying files
--fix
Apply scaffolding and hardening without prompting
--pin <tag>
Release tag to install/pin (resolved to a SHA before writing refs)
Upstream contributions
Installer pin — reported, merged, shipped: action.yml now runs the bundled
${{ github.action_path }}/install.sh, so a SHA-pinned uses: also pins the installer. Released;
the caveat in Step 5 applies only to v0.6.2 and earlier.
Floating version: default — reported, open (Connorrmcd6/surface#169):
proposes the default itself stop being latest, so the SHA pin becomes transitive. Independent of
the fix here — set version: explicitly regardless, since anyone pinning an older release needs it.
See Also
/configure:web-session — install surf in Claude Code web sessions
/configure:pre-commit — pre-commit framework setup this plugs into
blueprint:blueprint-docs-currency — same-commit doc discipline (the convention-level complement)
blueprint:blueprint-sync — drift detection for generated content
code-quality:code-review — the semantic reviewer for Surface's JSON verdicts
