drift-detection: Research & Knowledge for AI Agents | OpenAgentSkill

Overview

Identify where a design system has diverged from its original intent across the whole system — components implemented differently to spec, tokens overridden locally, patterns forked across teams. This is a system-wide sweep for divergence patterns, NOT a single-component spec comparison. Trigger when someone says: find drift, where has the system diverged, design code inconsistency, what's out of sync, where are teams going off-system, component drift, or anything about identifying gaps between design system intent and actual implementation. Do NOT trigger for checking one specific component against its design spec — use design-to-code-check for that.

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Drift detection

A skill for identifying and classifying drift in a design system — the accumulated distance between design system intent and actual implementation across consuming products. Produces a drift report with severity ratings, origin classification, and recommended response for each finding.

Context

Drift is the normal condition of a used design system. The question is not whether your system has drifted — it has — but whether the drift is intentional, how severe it is, and whether it is compounding.

Not all drift is bad. A product team that made a deliberate, documented exception to an established pattern is making a design decision. A product team that unknowingly re-implemented a design system component with slightly different spacing is creating maintenance debt. The distinction matters, because the response is different: intentional drift might become a contribution, while accidental drift needs to be corrected and its root cause addressed.

This skill distinguishes between drift types and routes each finding to the appropriate response.

Configuration

Before producing output, check for a .ds-ops-config.yml file in the project root. If present, load:

severity.* — overrides for drift finding severity ratings
system.styling — pre-selects token drift detection approach (CSS vars, SCSS, Tailwind, CSS-in-JS)
integrations.* — enables auto-pull for drift comparison data (see below)
recurring.* — enables comparison with previous drift report

Auto-pull integrations

If integrations are configured in .ds-ops-config.yml, pull data automatically:

Figma MCP (integrations.figma.enabled: true):

Read component specifications from the published library at integrations.figma.file_key
Use as the design-side reference for visual and API drift detection
Compare Figma component properties against code component props to detect API drift without manual specification

GitHub (integrations.github.enabled: true):

Search integrations.github.repo for code patterns that indicate drift:
- Hardcoded colour values outside the design system package
- Local component re-implementations (component names used outside the system's source)
- Token overrides using CSS !important on design token properties
Pull recent PRs to identify components changed outside the design system package
Use commit history on component files to detect version lag

Chromatic (integrations.chromatic.enabled: true):

Pull visual diff data — components with accepted visual changes outside a DS release cycle are potential visual drift
High rates of accepted changes may indicate the team is accepting drift rather than correcting it

If an integration fails, log it and proceed with manual input.

Recurring workflow

If recurring is configured in .ds-ops-config.yml:

Load the previous drift report from recurring.output_directory.
Compare against current findings:
- New drift instances since last run
- Resolved drift instances (corrected since last run)
- Persistent drift (present for 2+ cycles — escalate severity)
- Classification shift (e.g. accidental drift that became intentional divergence)
Add a "Drift trend" section to the report:
- Total drift count: increasing / stable / decreasing
- Drift velocity: how fast is new drift accumulating vs. being resolved?
- Classification trend: is the mix shifting toward more system gaps (E) or more accidental drift (C)?
Save output and prune per recurring.retain_count.

Step 1: Define the scope

Ask for or confirm (skip questions already answered by auto-pull):

What is being assessed? (Specific product, specific component set, specific token scope, or full system)
What sources are available for comparison? (Figma files, codebase, documentation, Storybook, token files in any format — JSON, CSS custom properties, SCSS variables, Tailwind config)
Are there specific areas where drift is already suspected?
Is there any known intentional divergence that should be documented rather than flagged as a problem?

The more specific the scope, the more actionable the report. A drift detection across "the whole system" surfaces patterns but produces a long list of findings with limited prioritisation signal. Scoping to a specific product or a specific component category produces a more actionable output.

Small-system note (fewer than 5 components): For systems this size, scope to the full system — there is no need to sample. Drift patterns are different in small systems: teams are typically smaller and more aligned, so drift is less likely to be accidental and more likely to be intentional divergence (Classification A) or a system gap (Classification E). Simplify the output to a per-component checklist rather than a full drift report. If all components show no drift, state that as the finding and recommend a review cadence.

Step 2: Establish the reference point

Drift is always relative to something. Confirm the source of truth being used as the reference:

The design system's Figma library
The published component package at a specific version
The documented specification for each component
All of the above (inconsistencies between these are themselves a drift signal)

If there is no clear single source of truth, that is a finding in itself and should be included at the top of the report.

Step 3: Identify drift instances

Assess across four dimensions:

Visual drift

Differences in the visual treatment of a component or pattern compared to the design system reference. Includes spacing, colour (particularly non-token values), typography, border radius, shadow, and icon usage.

For each instance: name the component or pattern, describe the visual difference, and note whether it appears to be intentional or accidental.

Behavioural drift

Differences in interactive behaviour — state transitions, animation, timing, keyboard behaviour, focus management — compared to the designed and documented component behaviour.

Behavioural drift is often the hardest to detect without direct testing, but it carries the highest risk because it includes accessibility regressions.

API drift

Components implemented with different props, different prop names, or different prop semantics than the design system's published API. This is most common when teams implement a component locally rather than consuming it from the system, or when a local version was built before the system component existed and was never migrated.

Token drift

Raw values used where design tokens should be referenced. Tokens referenced at the wrong tier. Local token overrides that conflict with semantic intent. Token names used inconsistently across implementations.

Detection depends on the styling approach: in CSS custom properties, look for raw values outside var(). In SCSS, look for raw literals not using $ variables. In Tailwind, look for arbitrary value brackets (h-[12px], bg-[#ff0000]) — standard utility classes that resolve to configured tokens are not drift. In CSS-in-JS, look for raw values outside theme object references. When SCSS variables are the token system, tier can be inferred from naming patterns (e.g. $color-blue-500 → primitive, $color-action-primary → semantic) even without a full SCSS parser.

Step 4: Classify each drift instance

Classify every finding before assigning a response:

Classification A: Intentional divergence The product team made a deliberate decision to diverge from the system, for a known reason. This may be appropriate (the system does not serve this context) or a contribution candidate (the need is real and should be in the system).

Classification B: Version lag The implementation matches an older version of the design system. The system has moved on; the product has not. This is not a mistake — it is normal entropy — but it accumulates into a migration burden if left unaddressed.

Classification C: Accidental drift The implementation diverged from the system without intent. Most commonly caused by implementing a component locally when the system version was not yet available, then not migrating once it was.

Classification D: Misunderstanding The implementation reflects a misreading of the documentation or specification. The consumer thought they were using the system correctly and did not know they were not.

Classification E: System gap The drift exists because the system did not have what the product team needed. The divergent implementation is the product team's solution to a design system gap, not a mistake.

Step 4a: Drift impact severity weighting

Not all drift carries equal risk. Weight severity by component criticality:

Critical path components (core navigation, authentication, checkout, primary data entry) — drift here is automatically elevated one severity level. A Medium finding on a checkout component becomes High.

High-traffic components (buttons, form inputs, cards, modals) — drift here affects the most users. Weight stays as assessed but flag the blast radius.

Utility components (layout wrappers, spacing helpers, icon containers) — drift here is lower risk. A Medium finding may be downgraded to Low if the component is not user-facing.

Recommendation paths by classification

After classifying each drift instance, route it to the appropriate response:

Classification	Primary response	Skill to run next
A — Intentional divergence	Document as a decision record	`decision-record`
B — Version lag	Offer migration path with effort estimate	`deprecation-process` (for migration guidance)
C — Accidental drift	Fix the implementation + review docs that failed to prevent it	`design-to-code-check`
D — Misunderstanding	Update documentation + notify affected teams	`change-communication`
E — System gap	Route to contribution workflow	`contribution-workflow`

Step 4b: Breaking change impact modelling

For drift classified as B (version lag), model the migration impact:

Per-instance migration cost:

How many files/components are affected by this specific drift?
Is the migration a simple find-and-replace (prop rename, token swap) or a structural refactor (API redesign, composition change)?
What is the testing surface area — does migrating this instance require regression testing across the consuming application?

Aggregate migration debt:

Total instances of version lag across all assessed products
Estimated effort to bring all instances current (rough T-shirt sizing: S/M/L per migration)
Identify migration batches — drift instances that can be resolved together because they share a root cause (e.g., all products still on v2 Button)

Migration path clarity:

For each version lag instance, is the migration path documented? If the design system shipped a breaking change without a migration guide, that is a governance finding (flag it separately).
Are there migration codemods or scripts available? If not, recommend whether the

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File metadata

name: drift-detection
description: "Identify where a design system has diverged from its original intent across the whole system — components implemented differently to spec, tokens overridden locally, patterns forked across teams. This is a system-wide sweep for divergence patterns, NOT a single-component spec comparison. Trigger when someone says: find drift, where has the system diverged, design code inconsistency, what's out of sync, where are teams going off-system, component drift, or anything about identifying gaps between design system intent and actual implementation. Do NOT trigger for checking one specific component against its design spec — use design-to-code-check for that."
references:
  - ../../knowledge-notes/token-architecture.md
  - ../../knowledge-notes/design-to-code-contract.md
  - ../../knowledge-notes/output-discipline.md

View original text

---
name: drift-detection
description: "Identify where a design system has diverged from its original intent across the whole system — components implemented differently to spec, tokens overridden locally, patterns forked across teams. This is a system-wide sweep for divergence patterns, NOT a single-component spec comparison. Trigger when someone says: find drift, where has the system diverged, design code inconsistency, what's out of sync, where are teams going off-system, component drift, or anything about identifying gaps between design system intent and actual implementation. Do NOT trigger for checking one specific component against its design spec — use design-to-code-check for that."
references:
- ../../knowledge-notes/token-architecture.md
- ../../knowledge-notes/design-to-code-contract.md
- ../../knowledge-notes/output-discipline.md
---

# Drift detection

## Context

This skill distinguishes between drift types and routes each finding to the appropriate response.

---

## Configuration

Before producing output, check for a `.ds-ops-config.yml` file in the project root. If present, load:
- `severity.*` — overrides for drift finding severity ratings
- `system.styling` — pre-selects token drift detection approach (CSS vars, SCSS, Tailwind, CSS-in-JS)
- `integrations.*` — enables auto-pull for drift comparison data (see below)
- `recurring.*` — enables comparison with previous drift report

## Auto-pull integrations

If integrations are configured in `.ds-ops-config.yml`, pull data automatically:

**Figma MCP** (`integrations.figma.enabled: true`):
- Read component specifications from the published library at `integrations.figma.file_key`
- Use as the design-side reference for visual and API drift detection
- Compare Figma component properties against code component props to detect API drift without manual specification

**GitHub** (`integrations.github.enabled: true`):
- Search `integrations.github.repo` for code patterns that indicate drift:
- Hardcoded colour values outside the design system package
- Local component re-implementations (component names used outside the system's source)
- Token overrides using CSS `!important` on design token properties
- Pull recent PRs to identify components changed outside the design system package
- Use commit history on component files to detect version lag

**Chromatic** (`integrations.chromatic.enabled: true`):
- Pull visual diff data — components with accepted visual changes outside a DS release cycle are potential visual drift
- High rates of accepted changes may indicate the team is accepting drift rather than correcting it

If an integration fails, log it and proceed with manual input.

## Recurring workflow

If `recurring` is configured in `.ds-ops-config.yml`:

1. **Load the previous drift report** from `recurring.output_directory`.
2. **Compare against current findings:**
- New drift instances since last run
- Resolved drift instances (corrected since last run)
- Persistent drift (present for 2+ cycles — escalate severity)
- Classification shift (e.g. accidental drift that became intentional divergence)
3. **Add a "Drift trend" section** to the report:
- Total drift count: increasing / stable / decreasing
- Drift velocity: how fast is new drift accumulating vs. being resolved?
- Classification trend: is the mix shifting toward more system gaps (E) or more accidental drift (C)?
4. **Save output** and prune per `recurring.retain_count`.

## Step 1: Define the scope

Ask for or confirm (skip questions already answered by auto-pull):
- What is being assessed? (Specific product, specific component set, specific token scope, or full system)
- What sources are available for comparison? (Figma files, codebase, documentation, Storybook, token files in any format — JSON, CSS custom properties, SCSS variables, Tailwind config)
- Are there specific areas where drift is already suspected?
- Is there any known intentional divergence that should be documented rather than flagged as a problem?

**Small-system note (fewer than 5 components):** For systems this size, scope to the full system — there is no need to sample. Drift patterns are different in small systems: teams are typically smaller and more aligned, so drift is less likely to be accidental and more likely to be intentional divergence (Classification A) or a system gap (Classification E). Simplify the output to a per-component checklist rather than a full drift report. If all components show no drift, state that as the finding and recommend a review cadence.

## Step 2: Establish the reference point

Drift is always relative to something. Confirm the source of truth being used as the reference:

- The design system's Figma library
- The published component package at a specific version
- The documented specification for each component
- All of the above (inconsistencies between these are themselves a drift signal)

If there is no clear single source of truth, that is a finding in itself and should be included at the top of the report.

## Step 3: Identify drift instances

Assess across four dimensions:

### Visual drift
Differences in the visual treatment of a component or pattern compared to the design system reference. Includes spacing, colour (particularly non-token values), typography, border radius, shadow, and icon usage.

For each instance: name the component or pattern, describe the visual difference, and note whether it appears to be intentional or accidental.

### Behavioural drift
Differences in interactive behaviour — state transitions, animation, timing, keyboard behaviour, focus management — compared to the designed and documented component behaviour.

Behavioural drift is often the hardest to detect without direct testing, but it carries the highest risk because it includes accessibility regressions.

### API drift
Components implemented with different props, different prop names, or different prop semantics than the design system's published API. This is most common when teams implement a component locally rather than consuming it from the system, or when a local version was built before the system component existed and was never migrated.

### Token drift
Raw values used where design tokens should be referenced. Tokens referenced at the wrong tier. Local token overrides that conflict with semantic intent. Token names used inconsistently across implementations.

Detection depends on the styling approach: in CSS custom properties, look for raw values outside `var()`. In SCSS, look for raw literals not using `$` variables. In Tailwind, look for arbitrary value brackets (`h-[12px]`, `bg-[#ff0000]`) — standard utility classes that resolve to configured tokens are not drift. In CSS-in-JS, look for raw values outside theme object references. When SCSS variables are the token system, tier can be inferred from naming patterns (e.g. `$color-blue-500` → primitive, `$color-action-primary` → semantic) even without a full SCSS parser.

## Step 4: Classify each drift instance

Classify every finding before assigning a response:

**Classification A: Intentional divergence**
The product team made a deliberate decision to diverge from the system, for a known reason. This may be appropriate (the system does not serve this context) or a contribution candidate (the need is real and should be in the system).

**Classification B: Version lag**
The implementation matches an older version of the design system. The system has moved on; the product has not. This is not a mistake — it is normal entropy — but it accumulates into a migration burden if left unaddressed.

**Classification C: Accidental drift**
The implementation diverged from the system without intent. Most commonly caused by implementing a component locally when the system version was not yet available, then not migrating once it was.

**Classification D: Misunderstanding**
The implementation reflects a misreading of the documentation or specification. The consumer thought they were using the system correctly and did not know they were not.

**Classification E: System gap**
The drift exists because the system did not have what the product team needed. The divergent implementation is the product team's solution to a design system gap, not a mistake.

## Step 4a: Drift impact severity weighting

Not all drift carries equal risk. Weight severity by component criticality:

**Critical path components** (core navigation, authentication, checkout, primary data entry) — drift here is automatically elevated one severity level. A Medium finding on a checkout component becomes High.

**High-traffic components** (buttons, form inputs, cards, modals) — drift here affects the most users. Weight stays as assessed but flag the blast radius.

**Utility components** (layout wrappers, spacing helpers, icon containers) — drift here is lower risk. A Medium finding may be downgraded to Low if the component is not user-facing.

### Recommendation paths by classification

After classifying each drift instance, route it to the appropriate response:

| Classification | Primary response | Skill to run next |
|---|---|---|
| A — Intentional divergence | Document as a decision record | `decision-record` |
| B — Version lag | Offer migration path with effort estimate | `deprecation-process` (for migration guidance) |
| C — Accidental drift | Fix the implementation + review docs that failed to prevent it | `design-to-code-check` |
| D — Misunderstanding | Update documentation + notify affected teams | `change-communication` |
| E — System gap | Route to contribution workflow | `contribution-workflow` |

## Step 4b: Breaking change impact modelling

For drift classified as B (version lag), model the migration impact:

**Per-instance migration cost:**
- How many files/components are affected by this specific drift?
- Is the migration a simple find-and-replace (prop rename, token swap) or a structural refactor (API redesign, composition change)?
- What is the testing surface area — does migrating this instance require regression testing across the consuming application?

**Aggregate migration debt:**
- Total instances of version lag across all assessed products
- Estimated effort to bring all instances current (rough T-shirt sizing: S/M/L per migration)
- Identify migration batches — drift instances that can be resolved together because they share a root cause (e.g., all products still on v2 Button)

**Migration path clarity:**
- For each version lag instance, is the migration path documented? If the design system shipped a breaking change without a migration guide, that is a governance finding (flag it separately).
- Are there migration codemods or scripts available? If not, recommend whether the

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Source repository: murphytrueman/design-system-ops
License: MIT
Version: 1.0.0
Last GitHub push: Aug 22, 2026
Registry updated: Sep 4, 2026
Instruction path: skills/drift-detection/SKILL.md @ 2f3963ffcf20

Version reported in registry metadata; check source releases before relying on it.

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      "not_relevant": 0,
      "success_rate": null,
      "recent_success_rate": null,
      "recent_failure_rate": null,
      "install_attempts": 0,
      "install_success_rate": null,
      "risk_blocked": 0,
      "setup_required": 0,
      "avg_output_quality": null,
      "production_outcomes": 0,
      "last_outcome_at": null,
      "label": "No agent outcome data yet"
    },
    "auto_install": {
      "allowed": false,
      "sandbox_required": true,
      "reason": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
    },
    "best_for": [
      "research",
      "agent-skill"
    ],
    "known_risks": [
      "This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, filesystem or document access",
      "Stars/forks activity: 174 stars, 7 forks; issue activity unavailable in current metadata",
      "Dependency/runtime risk: credential or environment access, network or browser surface",
      "Permission surface: secrets or environment access, filesystem or document 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": 79,
    "risk_level": "risky",
    "risk_label": "Risky",
    "warnings": [
      "Dependency or permission surface needs review",
      "Permission surface may require sandboxing",
      "Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required",
      "This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, filesystem or document access",
      "Stars/forks activity: 174 stars, 7 forks; issue activity unavailable in current metadata",
      "Dependency/runtime risk: credential or environment access, network or browser surface"
    ]
  },
  "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": 69,
    "label": "Promising"
  },
  "supply": {
    "track": "Research and knowledge work",
    "scenario": "Research agents",
    "maintenance": "26d since push",
    "risk": "Risky"
  },
  "alternative_skills": [
    {
      "slug": "yanliudesign-mono-color-skill",
      "name": "mono-color",
      "url": "https://www.openagentskill.com/skills/yanliudesign-mono-color-skill",
      "stars": 1919,
      "install_command": "npx skills add yanliudesign/mono-color-skill --skill mono-color",
      "trust_score": 85,
      "audit_score": 93
    }
  ],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "high-compliance environments without internal security review",
    "No OpenAgentSkill engagement data yet",
    "Audit risk risky exceeds max_risk=medium",
    "High-risk permission hints: Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required"
  ],
  "agent_contract": {
    "task_input": "Use drift-detection 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: 74/100 Strong shortlist",
      "Audit: 79/100 Risky",
      "Safety: 43/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "murphytrueman-drift-detection (drift-detection)",
      "install_command": "npx skills add murphytrueman/design-system-ops --skill drift-detection",
      "risk_summary": "Risky; 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": "murphytrueman-drift-detection",
      "task": "Use drift-detection 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/murphytrueman-drift-detection",
    "api": "https://www.openagentskill.com/api/agent/skills/murphytrueman-drift-detection",
    "audit": "https://www.openagentskill.com/skills/murphytrueman-drift-detection/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=murphytrueman-drift-detection&task=Use%20drift-detection%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20drift-detection%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20drift-detection%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/murphytrueman-drift-detection/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/murphytrueman-drift-detection"
  }
}

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Creator: murphytrueman
Source: murphytrueman/design-system-ops
Indexed by: OpenAgentSkill community index

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