Harness i18n Process

Cognitive mode: advisory-guide. Inject i18n considerations into brainstorming, planning, and review workflows. Adapt enforcement based on project configuration — gentle prompts when unconfigured, gate-mode validation when enabled.

When to Use

• When

  on_new_feature

  triggers fire and the feature may touch user-facing strings
• When

  on_review

  triggers fire to validate i18n was considered in specs, plans, or code
• When brainstorming a feature that will have user-facing text, labels, messages, or notifications
• When planning tasks for a feature that involves UI, API responses, emails, or notifications
• When reviewing code changes that add or modify user-facing strings
• NOT for scanning code for i18n violations (use harness-i18n)
• NOT for setting up translation infrastructure (use harness-i18n-workflow)
• NOT for performing translations (use TMS tools or MCP integrations)

Core Principle

Make i18n impossible to forget.

This skill does not scan code or manage translations. It ensures that i18n is considered at every stage of the development process — before code is written, while it is being planned, and when it is being reviewed. It operates in two modes:

• Prompt mode (default): Non-blocking nudges that seed i18n awareness. Used when i18n is not configured or is disabled. The goal is to make teams aware of i18n considerations without being annoying.
• Gate mode (configured): Validation that enforces i18n requirements. Used when

  i18n.enabled: true

  in

  harness.config.json

  . The strictness level (

  permissive

  ,

  standard

  ,

  strict

  ) controls whether missing i18n produces informational notes, warnings, or blocking errors.

If you find yourself scanning source code for hardcoded strings, STOP. That is

harness-i18n

's job. This skill operates on artifacts (specs, plans, reviews), not source code.

Process

Phase 1: CHECK-CONFIG — Determine Operating Mode

1. Read harness configuration. Check

   harness.config.json

   for the

   i18n

   block:
   • If

     i18n.enabled: true

     exists: enter gate mode. Load

     i18n.strictness

     (default:

     standard

     ).
   • If

     i18n.enabled: false

     exists: enter prompt mode with reduced frequency. The team explicitly disabled i18n — respect that, but still nudge on obviously international features.
   • If no

     i18n

     block exists: enter prompt mode. The team has not considered i18n yet — this is where the skill adds the most value.

2. Load context from configuration (gate mode only). When in gate mode, read:

   • i18n.targetLocales

     — which locales are supported. Use this to provide specific guidance (e.g., "You are targeting Arabic — have you considered RTL layout for this feature?").

   • i18n.platforms

     — which platforms are in scope. Only validate i18n for relevant platforms.

   • i18n.industry

     — load industry-specific i18n guidance from

     agents/skills/shared/i18n-knowledge/industries/{industry}.yaml

     if configured.

   • i18n.strictness

     — determines enforcement level:

     • permissive

       : informational notes only, never block

     • standard

       : warnings for missing i18n in user-facing features, do not block

     • strict

       : errors that block progression when i18n is unaddressed

3. Determine the current workflow context. Identify which workflow triggered this skill:

   • Brainstorming (

     on_new_feature

     during

     harness-brainstorming

     ): inject during Phase 2 EVALUATE.
   • Planning (

     on_new_feature

     during

     harness-planning

     ): inject during task decomposition.
   • Review (

     on_review

     during

     harness-code-review

     or

     harness-pre-commit-review

     ): inject during review checklist.

---

Phase 2: INJECT — Add i18n Considerations

Prompt Mode (unconfigured or disabled)

Inject non-blocking i18n consideration prompts at the appropriate workflow point. These are suggestions, not requirements. Present them as questions the team should consider.

During brainstorming (Phase 2 EVALUATE):

Add the following consideration to the evaluation criteria:

i18n Consideration
==================
For this feature, which user-facing strings will need translation?
Consider:
- UI labels, button text, placeholder text, error messages
- Email or notification content
- API error responses shown to users
- Date, number, and currency formatting
- Text that may expand significantly in other languages (+35% for German, +60% for Finnish)
- Content that may need right-to-left layout (Arabic, Hebrew)

If this feature will be used by an international audience, consider enabling i18n:
Run `harness skill run harness-i18n-workflow` to set up translation infrastructure.

During planning (task decomposition):

Suggest adding i18n tasks to the plan:

i18n Tasks to Consider
======================
If this feature includes user-facing strings, consider adding these tasks:
- [ ] Extract user-facing strings into translation keys
- [ ] Update translation files for all target locales
- [ ] Run pseudo-locale testing to check for text overflow and truncation
- [ ] Verify date/number/currency formatting uses locale-aware APIs
- [ ] Test RTL layout if targeting RTL locales

During code review:

Add i18n items to the review checklist:

i18n Review Checklist
=====================
- [ ] No new hardcoded user-facing strings (should use translation keys)
- [ ] Date/number/currency formatting uses Intl APIs or framework equivalents
- [ ] No string concatenation for user-facing messages (use interpolation)
- [ ] New UI elements have adequate space for text expansion
- [ ] lang and dir attributes are set appropriately

Gate Mode (i18n.enabled: true)

Validate that the artifact under review addresses i18n requirements. The enforcement level depends on

i18n.strictness

.

During brainstorming (Phase 2 EVALUATE):

Check whether the feature evaluation discusses locale considerations. If the feature involves user-facing content and does not mention i18n:

• permissive

  : add an informational note suggesting locale considerations

• standard

  : add a warning: "This feature involves user-facing strings but does not discuss i18n requirements. Consider which strings need translation and which locales are affected."

• strict

  : add an error: "This feature involves user-facing strings but does not address i18n. Add a locale requirements section before proceeding."

When target locales are configured, provide specific guidance based on locale profiles from

agents/skills/shared/i18n-knowledge/locales/

:

• If

  ar

  or

  he

  in target locales: "This feature needs RTL layout consideration."
• If

  de

  or

  fi

  in target locales: "Expect 35-60% text expansion. Verify UI can accommodate longer strings."
• If

  ja

  ,

  zh-Hans

  , or

  ko

  in target locales: "CJK scripts may need different font sizing and line-break rules."

During planning (task decomposition):

Validate that the plan includes i18n-related tasks for features that touch user-facing content. Check for:

• At least one task mentioning string extraction, translation keys, or i18n
• At least one task mentioning translation file updates (if target locales exist)
• At least one task mentioning locale testing or pseudo-localization (if strictness is standard or strict)

If missing:

• permissive

  : note suggesting i18n tasks

• standard

  : warning: "Plan for a user-facing feature does not include i18n tasks. Add tasks for string extraction, translation file updates, and locale testing."

• strict

  : error: "Plan for a user-facing feature is missing required i18n tasks. Add at minimum: string extraction task, translation update task. Plan cannot proceed without i18n coverage."

During code review:

Validate that the review artifact addresses i18n considerations. Do NOT scan source code directly — that is

harness-i18n

's responsibility. Instead, check the review context:

• Does the PR description mention i18n impact (new strings, locale changes, formatting)?
• If the PR touches user-facing components (based on file paths and PR description), was

  harness-i18n

  run as part of the review?
• Does the review checklist include i18n items (hardcoded string check, locale-aware formatting)?

If the review does not address i18n for a user-facing change:

• permissive

  : informational note suggesting i18n review items

• standard

  : warning: "PR touches user-facing code but i18n was not addressed in the review. Recommend running

  harness-i18n

  on the changed files."

• strict

  : error: "PR touches user-facing code and i18n review is required. Run

  harness-i18n

  on the changed files before merging."

---

Phase 3: VALIDATE — Verify i18n Was Addressed

After the inject phase, verify that the output artifact addresses i18n.

For Specs (brainstorming output)

Check the spec document for i18n coverage:

• Does it contain a "Localization", "i18n", or "Internationalization" section?
• Does it mention which strings are user-facing?
• Does it mention which locales are affected?
• Does it mention locale-specific formatting requirements (dates, numbers, currency)?

Gate mode enforcement:

• permissive

  : log result, do not block

• standard

  : warn if missing but allow progression

• strict

  : block progression if the spec lacks an i18n section and the feature touches user-facing content

For Plans (planning output)

Check the plan document for i18n tasks:

• Does it include at least one task with i18n-related keywords (i18n, translation, locale, localization, l10n)?
• Do the i18n tasks cover: extraction, file updates, and testing?

Gate mode enforcement:

• permissive

  : log result, do not block

• standard

  : warn if no i18n tasks found for user-facing feature

• strict

  : block progression if no i18n tasks exist

For Reviews (code review output)

Check the review output:

• Were i18n checklist items addressed?
• Were any new hardcoded strings flagged?
• If hardcoded strings were found, were they resolved or explicitly accepted?

Gate mode enforcement:

• permissive

  : log result, do not block

• standard

  : warn if i18n checklist was not completed

• strict

  : block if new hardcoded strings exist without explicit acceptance

Validation Report

Output a summary of the i18n validation:

i18n Process Validation
=======================
Mode:           gate (standard)
Workflow:        planning
Artifact:        docs/plans/2026-03-20-checkout-redesign-plan.md

Checks:
[PASS] Plan contains i18n-related task (Task 7: "Extract checkout strings")
[PASS] Plan includes translation file update task (Task 8: "Update locale files")
[WARN] Plan does not include pseudo-locale testing task

Result: PASS with warnings

Harness Integration

• harness-brainstorming

  — Injects i18n considerations during Phase 2 (EVALUATE). In prompt mode, adds a suggestion block. In gate mode, validates that locale requirements are discussed.

• harness-planning

  — Injects i18n task suggestions during task decomposition. In gate mode, validates that the plan includes i18n tasks for user-facing features.

• harness-code-review

  /

  harness-pre-commit-review

  — Adds i18n checklist items to the review. In gate mode, validates that no new hardcoded strings are introduced.

• harness-i18n

  — The process skill defers detailed code scanning to the core i18n skill. During review, the process skill does a lightweight check; the full scan is harness-i18n's responsibility.

• harness-i18n-workflow

  — The process skill recommends running the workflow skill when i18n is not yet configured. In prompt mode, it suggests

  harness skill run harness-i18n-workflow

  for setup.
• Knowledge base at

  agents/skills/shared/i18n-knowledge/

  — Locale profiles provide specific guidance for configured target locales. Industry profiles provide domain-specific i18n prompts.

• harness.config.json

  — The

  i18n

  block drives mode selection and enforcement level. When the config changes, the skill automatically adapts its behavior.

Success Criteria

• When i18n is unconfigured, brainstorming/planning receive a non-blocking nudge about locale considerations
• When

  i18n.enabled: true

  and

  strictness: "standard"

  , specs/plans missing i18n handling produce a warning
• When

  i18n.enabled: true

  and

  strictness: "strict"

  , specs/plans missing i18n handling produce an error that blocks progression
• Prompt mode suggestions are contextual -- they reference the feature being discussed, not generic boilerplate
• Gate mode validation references configured target locales and their specific requirements
• The skill never scans source code directly -- that is harness-i18n's job

• harness validate

  passes after all changes

Examples

Example 1: Prompt Mode During Brainstorming (Unconfigured Project)

Context: Team is brainstorming a new checkout flow. Project has no i18n configuration.

Phase 1: CHECK-CONFIG

No

i18n

block found in

harness.config.json

. Entering prompt mode.

Phase 2: INJECT (brainstorming EVALUATE)

i18n Consideration
==================
For the checkout flow, which user-facing strings will need translation?
Consider:
- Payment form labels ("Card number", "Expiry date", "CVV")
- Error messages ("Invalid card number", "Payment declined")
- Order summary text ("Subtotal", "Tax", "Total")
- Currency formatting (not all locales use $ or decimal points)
- Address form fields (vary significantly by country)

If this feature will be used by an international audience, consider enabling i18n:
Run `harness skill run harness-i18n-workflow` to set up translation infrastructure.

Phase 3: VALIDATE

i18n Process Validation
=======================
Mode:           prompt (unconfigured)
Workflow:        brainstorming
Result:         Suggestion provided (non-blocking)

Example 2: Gate Mode During Planning (Configured Project, Standard Strictness)

Context: E-commerce project with i18n enabled, targeting es, fr, de, ja, ar. Planning a new product review feature.

Phase 1: CHECK-CONFIG

i18n config loaded:
  enabled: true
  strictness: standard
  targetLocales: [es, fr, de, ja, ar]
  platforms: [web]
  industry: ecommerce
Entering gate mode (standard).

Phase 2: INJECT (planning task decomposition)

Scanning plan for i18n tasks... Found 0 i18n-related tasks in the plan.

[WARN] i18n Tasks Missing
=========================
This plan covers a user-facing feature (product reviews) but includes no i18n tasks.
Your project targets 5 locales: es, fr, de, ja, ar.

Required i18n tasks for this feature:
- Extract review form labels and messages into translation keys
- Update translation files for es, fr, de, ja, ar
- Verify RTL layout for Arabic locale (review cards, rating display, text input)
- Test text expansion for German (+35%) on review form labels
- Add pseudo-locale testing for overflow detection

Industry note (ecommerce): Product reviews often contain user-generated content.
Ensure the review display component handles mixed-direction text (user reviews
in Arabic within an English UI, or vice versa).

Phase 3: VALIDATE

i18n Process Validation
=======================
Mode:           gate (standard)
Workflow:        planning
Artifact:        docs/plans/2026-03-20-product-reviews-plan.md

Checks:
[FAIL] No i18n-related tasks found in plan
[FAIL] No translation file update tasks
[FAIL] No locale testing tasks

Result: WARNING -- plan should include i18n tasks before execution

Example 3: Gate Mode During Review (Configured Project, Strict)

Context: SaaS project with

strictness: "strict"

. Reviewing a PR that adds a new settings page.

Phase 1: CHECK-CONFIG

Entering gate mode (strict).

Phase 2: INJECT (code review)

i18n Review Validation
======================
Checking review context for i18n coverage...

PR: "Add settings page" (#142)
Changed files: src/components/Settings.tsx, src/components/SettingsForm.tsx
PR description mentions: new UI components, form fields, toast notifications

i18n review status:
  - PR description does not mention i18n impact: MISSING
  - harness-i18n scan not referenced in review: MISSING
  - Review checklist does not include i18n items: MISSING

[ERROR] PR touches user-facing code and i18n review is required.
Run `harness-i18n` on the changed files before merging.
Recommended: harness skill run harness-i18n --scope file --path src/components/Settings.tsx src/components/SettingsForm.tsx

Phase 3: VALIDATE

i18n Process Validation
=======================
Mode:           gate (strict)
Workflow:        review
Result:         BLOCKED -- i18n review not conducted for user-facing PR
Action:         Run harness-i18n scan on changed files, address findings, then re-review

Rationalizations to Reject

Rationalization	Reality
"I can see hardcoded strings in the component the user is discussing — I'll flag them now as part of the process review."	This skill operates on artifacts (specs, plans, review context), never on source code. Scanning source files is harness-i18n's responsibility. Running Grep on component files from within this skill violates the skill boundary, regardless of how convenient it seems.
"The feature clearly has no user-facing strings — it's a background job. I'll skip injection entirely without checking."	The skill must assess whether injection is applicable before skipping. Background jobs can produce user-facing output via notifications, emails, and error responses. A deliberate "not applicable" decision requires reading the feature description, not assuming.
"The team is in prompt mode and has dismissed the suggestion twice — I'll escalate to gate mode enforcement to make sure they take i18n seriously."	Escalating to gate mode is a configuration decision the team must make explicitly. Prompt mode is always dismissible. Unilaterally enforcing gate-mode behavior overrides a team's deliberate choice and violates the skill's core operating contract.
"The plan has one task called 'polish and cleanup' — that probably includes i18n work. I'll mark the i18n check as passing."	In gate mode, i18n task presence must be verified by keyword match (i18n, translation, locale, localization, l10n), not inferred from vague task names. Ambiguous tasks must be flagged as missing, not assumed to cover the requirement.
"The spec mentions 'multi-language support' in passing — that counts as addressing i18n, so I won't require a dedicated section."	A passing mention is not an i18n section. The validation check requires the spec to identify which strings are user-facing, which locales are affected, and any formatting requirements. A vague reference satisfies none of these.

Gates

These are hard stops. Violating any gate means the process has broken down.

• No source code scanning. This skill operates on artifacts (specs, plans, review context), not source code. If you are running Grep/Glob on

  .tsx

  files to find hardcoded strings, STOP. That is

  harness-i18n

  's job. During the review phase, check the review artifact (PR description, checklist, whether

  harness-i18n

  was run) — never scan the code directly.
• Respect the configured mode. If

  i18n.enabled: false

  , do not enforce gate-mode validation. If

  i18n.enabled: true

  , do not downgrade to prompt mode. The team made a configuration choice -- honor it.
• Respect the configured strictness.

  permissive

  never blocks.

  standard

  warns but does not block.

  strict

  blocks. Do not escalate or de-escalate the enforcement level.
• Prompt mode is always dismissible. In prompt mode, suggestions must be presented as questions or checklists the team can acknowledge and move past. Never block progression in prompt mode.
• Gate mode requires specificity. When flagging a missing i18n section or task, state exactly what is expected. "Add i18n section" is not specific enough. "Add a Localization section covering: which strings are user-facing, which locales are affected, formatting requirements" is specific.

Escalation

• When the feature clearly has no user-facing strings: Skip injection. Not every feature needs i18n. Internal tooling, background jobs, data migrations, and infrastructure changes should not receive i18n prompts. Use judgment based on the feature description.
• When the team repeatedly dismisses prompt-mode suggestions: Do not escalate to gate mode. That is a configuration decision the team must make. Instead, note: "If i18n is relevant to your project, consider enabling it: run

  harness skill run harness-i18n-workflow

  to configure."
• When gate-mode validation blocks a plan that genuinely does not need i18n: The team can either add an explicit "i18n: not applicable -- this feature has no user-facing strings" note to the plan, or adjust

  i18n.strictness

  to

  standard

  or

  permissive

  .
• When the spec/plan addresses i18n but not for all configured target locales: In standard mode, warn about the gap. In strict mode, require explicit acknowledgment of which locales are deferred and why.
• When industry-specific guidance conflicts with team practice: Present the industry guidance as a recommendation, not a requirement. The team's established patterns take precedence unless strictness is set to strict.