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.

Milestone

• Every milestone title you create or rename is one hyphenated token with no spaces (MCP-Read-foundations, Backtest-live-parity). This holds for every path that creates one: a batch from prd-to-issues, a split of one issue into follow-ups, or a manual request.
• Before you assign an issue to a milestone that has spaces in its title, rename that milestone to the hyphenated form (gh api -X PATCH repos/<owner>/<repo>/milestones/<number> -f title=<new-title>). The rename keeps every issue on the milestone. Quote a title that still has spaces in every gh call.

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.
• Complexity rationale line (first line of the body): matches the title prefix and ends with an explicit plan signal: **Complexity: 95/100** — Capability 3 (Risk 4, Uncertainty 2 — money/data-integrity on order-fill path); Volume 20 (Scope 4, Coupling 3, Verification 3) — Opus 5.5, high · plan: yes. The line always carries all five axis grades; the validate-issue scoring reference owns the axes and their anchors.
• plan signal: · plan: yes when the score is ≥ 75 (a plan is posted before the build, by Opus 5.5 at xhigh when the score is ≥ 85 and at high below 85, unless a Plan model: Fable 5.1 stamp asks for Fable, whose plan runs only at high; the builder is Opus 5.5 at high); · plan: no below 75. Always write it. Compatibility (owned here): the signal and the Execution block key were once spelled · fableplan: yes|no and **fableplan first:**, and the PR-title suffix , fableplan. Every reader accepts both spellings, every writer emits only plan, and a restamp rewrites an old spelling to the new one. Fable 5.1 effort tiers follow the LLM Attribution Footer section of CLAUDE.md.
• ## 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, the [C<score>] title prefix, or the complexity rationale line, as a rescore-only edit does) 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.