github-issue-format git:20260901.c877bb0A

Immutable. This exact content is served forever at /api/v1/blob/745dc8a452132031.

---
name: github-issue-format
description: Required format for creating or editing any GitHub issue — [C<score>] title convention, complexity rationale line, complete-body rule, mandatory Plain simple English section, attribution footer. Load BEFORE creating or editing a GitHub issue.
---

# GitHub issue format

## Title

- `[C<score>] <title>`: a plain-simple-English sentence in ASD-STE100, precise about component and behavior, e.g. `[C95] Orders can be filled twice when two fills arrive at the same moment`.
- The **complexity score (0–100)** is a model and effort routing signal. `validate-issue` step 6 owns the formula, axes, and routing table; never restate or approximate them here.

## Body

- **Never create a placeholder, stub, or empty-bodied issue.** Every issue gets a complete body at creation, even in a batch. If a follow-up is not ready to spec, track it in the parent issue or notes until it is.
- **Section order:** complexity rationale line, `## Problem`, `## Goal`, `## Approach`, `## Acceptance criteria`, `## Plain simple English`, then any Execution block, then the attribution footer. An Execution block is machine metadata and keeps its place between the last prose section and the footer.
- **Complexity rationale line** (first line of the body): matches the title prefix and ends with an explicit fableplan signal:
  `**Complexity: 95/100** — Capability 3 (Risk 4 — money/data-integrity on order-fill path); Volume 20 — Opus 5, xhigh · fableplan: yes`
- **fableplan signal:** `· fableplan: yes` when the score is ≥ 71 (a Fable 5.1 plan is posted before the build; the builder is Opus 5, high at 71–80, xhigh at 81+); `· fableplan: no` below 71. Always write it: absence is ambiguous. `xhigh` is legal only on Opus- or Sonnet-class builds; the LLM Attribution Footer section of CLAUDE.md owns the Fable effort ceiling.
- **`## Plain simple English` is mandatory on every issue:** one short paragraph under 55 words in ASD-STE100, per the CLAUDE.md/AGENTS.md Response Style definition. State what is wrong or missing and why it matters, for a reader who knows the product but not the code. Never restate the approach, list file paths or symbols, or give a time or effort estimate there. An edit that rewrites body prose adds the section when it is missing; an edit that changes only machine metadata (the Execution block, or the `[C<score>]` title prefix) leaves every prose section unchanged and does not add it.
- **LLM Attribution Footer** ends the body: `Created` for a new issue, `Validated` when a validation pass produced the edit (`validate-issue` and its wrappers), `Updated` for any other edit. Stack the new line under the existing ones; never replace them, and never append an exact duplicate of a line already there.
- **Project precedence:** a repo CLAUDE.md issue or footer format overrides this default.