Execution Context Builder

Take a full_context record and write the two canonical artifacts.

Activation Triggers

This skill activates when:

• flow-detector returned exactly one candidate (skip selector, come straight here).
• flow-selector has resolved the user's pick (or synthesized one from "Other").

This skill never asks the user a question. If the input full_context has missing fields, fill them with conservative defaults (see "Field Defaults" below) and move on.

Inputs

The skill receives:

• task — the original task description (string), and optionally a source ref (e.g., ENG-123).
• full_context — the chosen candidate's context record. Schema is defined in references/execution-context.json.

Process

1. Resolve the slug

Generate a slug from the task title:

• Lowercase, replace non-alphanumeric runs with -, strip leading/trailing -.
• Truncate to 60 characters max, on a word boundary.
• If the result is empty (no usable characters), fall back to clarification-YYYYMMDD-HHMMSS using the current local time.

Examples:

• "Send message on sign-in" → send-message-on-sign-in
• "Migrate auth to Better Auth (Phase 2)" → migrate-auth-to-better-auth-phase-2
• "!!!" → clarification-20260427-143022

2. Fill defaults

If any required field in full_context is missing, fill with these defaults:

Defaults are not user-visible questions — silently apply them.

3. Build the JSON artifact

Read references/execution-context.json, populate it from full_context, add metadata:

{
  "task": { "title": "<original task>", "source": "<ticket ref or null>", "slug": "<slug>" },
  "entity": "...",
  "trigger": { "event": "...", "timing": "...", "preconditions": [...] },
  "action": { "verb": "...", "channel": "...", "recipient": "..." },
  "flow": { "services": [...], "mode": "...", "transport": "..." },
  "failure_handling": { "strategy": "...", "details": "..." },
  "out_of_scope": [...],
  "metadata": {
    "created_at": "<ISO-8601>",
    "created_by": "[email protected]"
  }
}

Validate the result parses with a JSON parser before writing. If parsing fails, fix and retry; never write malformed JSON.

4. Build the Markdown artifact

Read references/execution-context.md, fill the template from the same full_context. Keep it human-readable — the developer is the primary reader.

5. Write both files

Path: .claude/clarifications/<slug>.local.md and .local.json.

• Create the .claude/clarifications/ directory if it doesn't exist.
• If a file with the same slug already exists, refuse to overwrite. Print:

A clarification already exists at .claude/clarifications/<slug>.local.md. Delete it first, or re-run /clarify with a different task title.

• Write atomically: write to a temp file, then rename. Prevents partial files on crash.

6. Optional cross-pack hooks (silent if absent)

After writing, if .claude/failure-log.local.md exists in the project, append a one-liner under "Pattern Mistakes":

- [<ISO-8601>] <slug> clarified — see .claude/clarifications/<slug>.local.md (kind: assumption-resolved)

If the failure-log file doesn't exist, skip silently. Do not create it.

7. Print the summary

✓ Execution context written:
  .claude/clarifications/<slug>.local.md
  .claude/clarifications/<slug>.local.json

Do not print the full content of either file. The developer opens the file to review.

Field Reference

See references/execution-context.md and references/execution-context.json for the canonical templates.

Anti-Patterns

Success Criteria

• [ ] Both .local.md and .local.json files are written.
• [ ] JSON parses cleanly with a strict parser.
• [ ] Markdown contains every required section: Task, Entity, Trigger, Action, Flow, Failure handling, Out of scope, Metadata.
• [ ] Slug matches the rules in step 1.
• [ ] No question was asked during execution-context generation.
• [ ] Optional failure-log append is silent when the file is absent.