dif-sh
Registry indexed
dif-generate-surfaces
Generating the initial set of dif.sh surfaces by reading the app's structure and product context. Use when the user wants to set up, scaffold, populate, auto-create, or propose surfaces for a dif project — especially right after `dif init`, when `dif/surfaces/` is empty or sparse
Overview
Generating the initial set of dif.sh surfaces by reading the app's structure and product context. Use when the user wants to set up, scaffold, populate, auto-create, or propose surfaces for a dif project — especially right after `dif init`, when `dif/surfaces/` is empty or sparse, or when `dif new` fails with "surface does not exist". Reads the codebase (routes, pages, README, package.json) plus `dif/context.json`, proposes a candidate set of surfaces with one-line rationales, confirms with the user, then writes the matching `dif/surfaces/<name>.md` files.
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Generating dif surfaces
Use this skill to produce the initial set of dif/surfaces/<name>.md files for a dif project — either right after dif init (which only writes the one default surface), or when dif new --surface X fails with "surface does not exist" because nobody's created X yet.
What a surface is
A surface is a unit of experimentation agency, not a unit of code. It's the place in the app where you'll run experiments — broadly: the home page, the checkout flow, the search results page, the signup form. One surface per place where you'd reasonably A/B test something.
Surfaces are not one-per-route or one-per-component. A typical app has 3–8 surfaces total, not 30. Over-fragmenting splits institutional memory across too many Learnings logs and makes the dif new "recent learnings on this surface" embed less useful.
Workflow
1. Survey existing state
List dif/surfaces/*.md. If many already exist, scope your work to "what's missing" — read each existing surface's H1 + description paragraph to understand what's already represented, then propose only the gaps. If the directory only contains the default home.md from dif init, propose a fresh set.
Also read dif/context.json if it exists — active experiments tell you which surfaces are already in real use.
2. Read product context
The point is to understand what the app does and where experimentation actually happens. Useful reads, in priority order:
README.md— what is this app, who uses it, what's the productpackage.json— framework signals (Next.js, Remix, Vite, etc.) tell you where the routes live- Routing files —
app/(Next.js app router),pages/(Next.js pages or Vite),src/routes/(Remix / SvelteKit),src/App.tsx(React Router config), and equivalents in other stacks dif/config.yaml— declared audience attributes hint at what dimensions the team already cares about- Any
docs/,ARCHITECTURE.md, or similar that explains the app's surface set
Don't fan out further than needed. The signal is usually obvious from README + routes in 1–2 minutes of reading.
3. Draft a candidate list
Aim for 3–8 surfaces. Each one gets:
- A kebab-case id (
checkout,signup,search-results) - A one-line rationale for why it deserves its own surface
Examples for a typical e-commerce app:
home— landing surface; first-touch optimization, hero copy / layout testssearch-results— list page after a user searches; ranking, filter UI, density testsproduct-detail— single-product page; image carousel, social proof, CTA copycart— cart review before checkout; abandonment-recovery, upsellscheckout— payment + confirm step; form length, trust signals, payment optionssignup— account creation flow; field count, social-auth prominence
Notice these are coarse-grained. There's no search-results-mobile or checkout-step-2 — those would be variants or audience predicates inside one surface, not separate surfaces.
4. Confirm with the user
Show the proposed list before writing. Format like this:
I'd propose these surfaces:
- home: landing surface; first-touch optimization
- checkout: payment step; form length, trust signals
- signup: account creation; field count, social-auth prominence
- search-results: post-search ranking and density
- product-detail: PDP CTA + social proof
Add, remove, or rename any before I write the files?
Accept renames, additions, removals. Push back gently on:
- Over-fragmentation (one per component, one per route).
- Surfaces for parts of the app the team won't realistically test (internal admin, debug panels, marketing splash).
- Plural or verbose names (
checkouts,checkout-flow-page) — suggest the singular kebab form.
5. Write each surface file
The file format mirrors what dif init emits for the default surface — keep the structure identical so the parser stays happy and dif new knows where to read the Learnings log from.
# Surface: <name>
(One-sentence description: where in the app is this surface? Who sees it?
What kind of experimentation happens here?)
## Known landmines
(Vendor DOM you can't touch, regulated regions, race conditions —
anything that's bitten a previous test on this surface. One bullet per.)
## Learnings
(One line per concluded test, appended automatically by `dif conclude`.)
Fill the description from product context — one to two concrete sentences. Leave ## Known landmines and ## Learnings as empty stub text. Both fields accrue from real experience, not speculation; pre-filling them with guesses pollutes future dif new drafts (which embed the last 3 Learnings into the experiment Brief).
After writing all of them, run dif validate to confirm the files parse cleanly. Then dif build to refresh dif/context.json so any agent picking up next sees the new surfaces.
6. Don't touch dif/config.yaml's default_surface
default_surface is the surface dif new writes to when no --surface flag is passed. The user picks it deliberately during dif init. Don't auto-flip it. If the user's default_surface doesn't appear in your proposed set, flag it as a question ("you've got default_surface: foo in config but no foo in the new list — keep the default or rename it?") rather than silently changing the config.
Naming conventions
- kebab-case, lowercase. Same as experiment ids.
- Singular:
checkout, notcheckouts. - One word when possible:
cart,signup,home. Two words when you need to disambiguate:search-results,product-detail. - Describes the place, not the test:
signup, notsignup-form-testornew-signup-flow. - Stable: a surface should remain valid for years. Rename only if the app fundamentally reorganizes.
Anti-patterns
- One surface per route. A 40-route Next.js app does not have 40 surfaces. Group routes by "what kind of test would I run here." If two routes share the same experimentation strategy, they share a surface.
- Speculation in Landmines or Learnings. Both fields should be empty until real experience fills them. The Learnings log is load-bearing — future
dif newdrafts on this surface embed the last 3 lines into the experiment Brief, so seeding it with guesses corrupts future briefs. - Surfaces for non-experimentation parts of the app. Admin tools, internal dashboards, marketing splash pages you won't iterate on — skip them. A surface earns its place by being tested.
- Auto-flipping
default_surface. That's a config change the user makes deliberately. Ask, don't act.
After surfaces exist
The natural next step is drafting an experiment. The dif-author-experiment skill picks up from here — dif new <id> --surface <one-of-the-new-surfaces> will now succeed instead of exit-3'ing.
File metadata
name: dif-generate-surfaces description: Generating the initial set of dif.sh surfaces by reading the app's structure and product context. Use when the user wants to set up, scaffold, populate, auto-create, or propose surfaces for a dif project — especially right after `dif init`, when `dif/surfaces/` is empty or sparse, or when `dif new` fails with "surface does not exist". Reads the codebase (routes, pages, README, package.json) plus `dif/context.json`, proposes a candidate set of surfaces with one-line rationales, confirms with the user, then writes the matching `dif/surfaces/<name>.md` files.
View original text
---
name: dif-generate-surfaces
description: Generating the initial set of dif.sh surfaces by reading the app's structure and product context. Use when the user wants to set up, scaffold, populate, auto-create, or propose surfaces for a dif project — especially right after `dif init`, when `dif/surfaces/` is empty or sparse, or when `dif new` fails with "surface does not exist". Reads the codebase (routes, pages, README, package.json) plus `dif/context.json`, proposes a candidate set of surfaces with one-line rationales, confirms with the user, then writes the matching `dif/surfaces/<name>.md` files.
---
# Generating dif surfaces
Use this skill to produce the initial set of `dif/surfaces/<name>.md` files for a dif project — either right after `dif init` (which only writes the one default surface), or when `dif new --surface X` fails with "surface does not exist" because nobody's created X yet.
## What a surface is
A surface is a unit of *experimentation agency*, not a unit of code. It's the place in the app where you'll run experiments — broadly: the home page, the checkout flow, the search results page, the signup form. One surface per place where you'd reasonably A/B test something.
Surfaces are **not** one-per-route or one-per-component. A typical app has 3–8 surfaces total, not 30. Over-fragmenting splits institutional memory across too many Learnings logs and makes the `dif new` "recent learnings on this surface" embed less useful.
## Workflow
### 1. Survey existing state
List `dif/surfaces/*.md`. If many already exist, scope your work to "what's missing" — read each existing surface's H1 + description paragraph to understand what's already represented, then propose only the gaps. If the directory only contains the default `home.md` from `dif init`, propose a fresh set.
Also read `dif/context.json` if it exists — active experiments tell you which surfaces are already in real use.
### 2. Read product context
The point is to understand what the app does and where experimentation actually happens. Useful reads, in priority order:
- `README.md` — what is this app, who uses it, what's the product
- `package.json` — framework signals (Next.js, Remix, Vite, etc.) tell you where the routes live
- Routing files — `app/` (Next.js app router), `pages/` (Next.js pages or Vite), `src/routes/` (Remix / SvelteKit), `src/App.tsx` (React Router config), and equivalents in other stacks
- `dif/config.yaml` — declared audience attributes hint at what dimensions the team already cares about
- Any `docs/`, `ARCHITECTURE.md`, or similar that explains the app's surface set
Don't fan out further than needed. The signal is usually obvious from README + routes in 1–2 minutes of reading.
### 3. Draft a candidate list
Aim for 3–8 surfaces. Each one gets:
- A kebab-case id (`checkout`, `signup`, `search-results`)
- A one-line rationale for why it deserves its own surface
Examples for a typical e-commerce app:
- `home` — landing surface; first-touch optimization, hero copy / layout tests
- `search-results` — list page after a user searches; ranking, filter UI, density tests
- `product-detail` — single-product page; image carousel, social proof, CTA copy
- `cart` — cart review before checkout; abandonment-recovery, upsells
- `checkout` — payment + confirm step; form length, trust signals, payment options
- `signup` — account creation flow; field count, social-auth prominence
Notice these are coarse-grained. There's no `search-results-mobile` or `checkout-step-2` — those would be variants or audience predicates inside one surface, not separate surfaces.
### 4. Confirm with the user
Show the proposed list before writing. Format like this:
```
I'd propose these surfaces:
- home: landing surface; first-touch optimization
- checkout: payment step; form length, trust signals
- signup: account creation; field count, social-auth prominence
- search-results: post-search ranking and density
- product-detail: PDP CTA + social proof
Add, remove, or rename any before I write the files?
```
Accept renames, additions, removals. Push back gently on:
- Over-fragmentation (one per component, one per route).
- Surfaces for parts of the app the team won't realistically test (internal admin, debug panels, marketing splash).
- Plural or verbose names (`checkouts`, `checkout-flow-page`) — suggest the singular kebab form.
### 5. Write each surface file
The file format mirrors what `dif init` emits for the default surface — keep the structure identical so the parser stays happy and `dif new` knows where to read the Learnings log from.
```md
# Surface: <name>
(One-sentence description: where in the app is this surface? Who sees it?
What kind of experimentation happens here?)
## Known landmines
(Vendor DOM you can't touch, regulated regions, race conditions —
anything that's bitten a previous test on this surface. One bullet per.)
## Learnings
(One line per concluded test, appended automatically by `dif conclude`.)
```
Fill the description from product context — one to two concrete sentences. Leave `## Known landmines` and `## Learnings` as empty stub text. Both fields accrue from real experience, not speculation; pre-filling them with guesses pollutes future `dif new` drafts (which embed the last 3 Learnings into the experiment Brief).
After writing all of them, run `dif validate` to confirm the files parse cleanly. Then `dif build` to refresh `dif/context.json` so any agent picking up next sees the new surfaces.
### 6. Don't touch `dif/config.yaml`'s `default_surface`
`default_surface` is the surface `dif new` writes to when no `--surface` flag is passed. The user picks it deliberately during `dif init`. Don't auto-flip it. If the user's `default_surface` doesn't appear in your proposed set, flag it as a question ("you've got `default_surface: foo` in config but no `foo` in the new list — keep the default or rename it?") rather than silently changing the config.
## Naming conventions
- **kebab-case**, lowercase. Same as experiment ids.
- **Singular**: `checkout`, not `checkouts`.
- **One word when possible**: `cart`, `signup`, `home`. Two words when you need to disambiguate: `search-results`, `product-detail`.
- **Describes the place, not the test**: `signup`, not `signup-form-test` or `new-signup-flow`.
- **Stable**: a surface should remain valid for years. Rename only if the app fundamentally reorganizes.
## Anti-patterns
- **One surface per route.** A 40-route Next.js app does not have 40 surfaces. Group routes by "what kind of test would I run here." If two routes share the same experimentation strategy, they share a surface.
- **Speculation in Landmines or Learnings.** Both fields should be empty until real experience fills them. The Learnings log is load-bearing — future `dif new` drafts on this surface embed the last 3 lines into the experiment Brief, so seeding it with guesses corrupts future briefs.
- **Surfaces for non-experimentation parts of the app.** Admin tools, internal dashboards, marketing splash pages you won't iterate on — skip them. A surface earns its place by being tested.
- **Auto-flipping `default_surface`.** That's a config change the user makes deliberately. Ask, don't act.
## After surfaces exist
The natural next step is drafting an experiment. The `dif-author-experiment` skill picks up from here — `dif new <id> --surface <one-of-the-new-surfaces>` will now succeed instead of exit-3'ing.
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- MIT
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Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
- Dependency or permission surface needs review
- Permission surface may require sandboxing
- Financial research output is not financial advice; require human review before any live investment decision
- Low GitHub adoption signal
- AI review approval is missing
- Financial research output is not financial advice; require human review before any live investment decision.
- Quality score needs review
- Permission surface needs review: secrets or environment access, shell or command execution
- GitHub adoption: 27 GitHub stars
- Stars/forks activity: 27 stars, 0 forks; issue activity unavailable in current metadata
- Dependency/runtime risk: command execution surface, credential or environment access
- Permission surface: secrets or environment access, shell or command execution
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Start with one small task
- 1Read the source. Confirm the input, expected output, dependencies and permissions.
- 2Ask your agent for a plan. Approve setup and any costs before running a small isolated test.
- 3Check the output and changed files. Report only what actually ran; keep the source revision for reproduction.
Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Source & usage notes
IndexedStatic Checked
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
- Source repository
- dif-sh/dif
- License
- MIT
- Version
- Unknown
- Last GitHub push
- Oct 8, 2026
- Registry updated
- Oct 8, 2026
Version reported in registry metadata; check source releases before relying on it.
Quality
56/100
Promising
Trust
62/100
Sandbox only
Audit
73/100
Needs review
- Dependency or permission surface needs review
- Permission surface may require sandboxing
- Financial research output is not financial advice; require human review before any live investment decision
- Low GitHub adoption signal
- AI review approval is missing
- Financial research output is not financial advice; require human review before any live investment decision.
- Quality score needs review
- Permission surface needs review: secrets or environment access, shell or command execution
- GitHub adoption: 27 GitHub stars
- Stars/forks activity: 27 stars, 0 forks; issue activity unavailable in current metadata
- Dependency/runtime risk: command execution surface, credential or environment access
- Permission surface: secrets or environment access, shell or command execution
- Verified installs
- —
- Outcomes
- —
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.
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This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
More details
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"known_risks": [
"AI review approval is missing",
"Financial research output is not financial advice; require human review before any live investment decision.",
"Low GitHub adoption signal",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, shell or command execution",
"GitHub adoption: 27 GitHub stars",
"Stars/forks activity: 27 stars, 0 forks; issue activity unavailable in current metadata",
"Dependency/runtime risk: command execution surface, credential or environment access"
]
},
"agent_proven": {
"version": "agent-proven-v1",
"score": 0,
"tier": "unproven",
"label": "Needs first agent run",
"summary": "No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.",
"metrics": {
"totalOutcomes": 0,
"successfulOutcomes": 0,
"failedOutcomes": 0,
"installAttempts": 0,
"installSuccessRate": null,
"successRate": null,
"recentSuccessRate": null,
"recentFailureRate": null,
"riskBlocked": 0,
"setupRequired": 0,
"notRelevant": 0,
"avgOutputQuality": null,
"avgTimeToUsefulMs": null,
"productionOutcomes": 0,
"humanReviewRequired": 0,
"uniqueAgents": 0,
"lastOutcomeAt": null
},
"signals": [],
"penalties": [
"No real agent outcome evidence yet"
]
},
"audit": {
"score": 73,
"risk_level": "needs_review",
"risk_label": "Needs review",
"warnings": [
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"Financial research output is not financial advice; require human review before any live investment decision",
"Low GitHub adoption signal",
"AI review approval is missing",
"Financial research output is not financial advice; require human review before any live investment decision.",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, shell or command execution"
]
},
"safety_gate": {
"tier": "blocked",
"label": "Blocked for auto-install",
"auto_install_policy": "block",
"auto_install_allowed": false,
"human_review_required": true,
"blocked": true,
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
},
"quality": {
"score": 56,
"label": "Promising"
},
"supply": {
"track": "Coding and developer agents",
"scenario": "Coding agents",
"maintenance": "5d since push",
"risk": "Needs review"
},
"alternative_skills": [],
"do_not_use_when": [
"teams that need a vendor-supported SLA",
"production agents without a repository review",
"Low GitHub adoption signal",
"High-risk permission hints: Shell or command execution, Secrets or environment access",
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"Financial research output is not financial advice; require human review before any live investment decision",
"AI review approval is missing"
],
"agent_contract": {
"task_input": "Use dif-generate-surfaces in an agent workflow",
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
"install_policy": "block",
"minimum_review_before_use": [
"Trust: 70/100 Manual review",
"Audit: 73/100 Needs review",
"Safety: 29/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "dif-sh-dif-generate-surfaces (dif-generate-surfaces)",
"install_command": "npx skills add dif-sh/dif --skill dif-generate-surfaces",
"risk_summary": "Needs review; Blocked for auto-install; Review before production",
"verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
}
},
"outcome_feedback": {
"endpoint": "https://www.openagentskill.com/api/agent/outcome",
"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
],
"payload_template": {
"event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
"skill_slug": "dif-sh-dif-generate-surfaces",
"task": "Use dif-generate-surfaces in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
"risk_blocked": false,
"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
}
},
"endpoints": {
"web": "https://www.openagentskill.com/skills/dif-sh-dif-generate-surfaces",
"api": "https://www.openagentskill.com/api/agent/skills/dif-sh-dif-generate-surfaces",
"audit": "https://www.openagentskill.com/skills/dif-sh-dif-generate-surfaces/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=dif-sh-dif-generate-surfaces&task=Use%20dif-generate-surfaces%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20dif-generate-surfaces%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20dif-generate-surfaces%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/dif-sh-dif-generate-surfaces/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/dif-sh-dif-generate-surfaces"
}
}For the creator
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- Creator
- dif-sh
- Source
- dif-sh/dif
- Indexed by
- OpenAgentSkill community index
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