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agent: builder model: opus max_turns: 70 budget_usd: 15 —

Brief: probe the id readers, and NodeId carries a span until numbered (#903, ADR-383)

Score: self-hosting lane (docs/priorities.md): the grammar rows of the parser/mod.rs slice plan (docs/selfhosting-plan.md, Large files) wait on #903 and #557; the owner decided the question on 2026-10-28 (ADR-383).

Facts

• Read issue #903 (brief, gate, traps, To build) and docs/specification/adr/adr-383.md first; this brief builds the steps named below of its To build list, as written there.
• Do not touch the rest of Trivia (semi, ran, comment, block_comment, PrTrivia::cut): that is #557’s.
• Gate: tests/ and tests/errors/ output byte-identical (spans reach every message): run the tests the change touches and the error tests whose spans come from expressions, not the full suite.

To build

1. Step 1 of #903 (probe): every reader of an id beyond equality and FIRST_BUILT; one that depends on the old order is fixed first, its own commit. If none, say so under Tests: (what was probed).
2. Step 2 of #903: NodeId::parsed() and setting the span once (innermost first); D3 equality and Debug unchanged. Report size_of::<Expr>() before and after in Body:. Commit node_id: a parsed id carries its span until numbered (#903); no Fixes.

Stop and report if

A reader depends on the old id order in a way that changes output and cannot be fixed in one commit; size_of::<Expr>() grows by more than 8 bytes (report before/after, Owner: asks whether to go on); an error in another agent’s file.

Read docs/builder-facts.md.

Rules (CLAUDE.md; this block is pasted into every brief, also a fix-forward)

• Read docs/builder-facts.md first. develop in the main checkout; git status at start: other agents’ uncommitted files are not yours, never touch or stage them.
• git add <files> only; commit after each step; git push origin develop fast-forward, no rebase (rejected: report Pushed: rejected, go on committing).
• Before pushing: cargo fmt, cargo clippy --all-targets -- -D warnings, scripts/pre-push-check.sh, and the gate of .claude/agents/builder.md (#852).
• No version lines, CHANGELOG.md, badges; no new NK code. New tests in Nikaia only; never the full suite. No foreground sleep, no polling; scripts in files.
• Disk: NIKAIA_CACHE_LIMIT=2G; at most two clones with target/ in the machine; delete your own clone’s target/ and target/release/nikaia-scratch at the end; report GB freed.

  Report (at most 15 lines, to exactly /home/user/Nikaia/docs/briefs/n903a-node-id-probe.md.report.md)

  Fields as in p1-large-files-plan.md (Result: bare word; Owner: a question or none; Deviation:/Found: none bare). Rs2nika: none unless a step moves Rust. Final answer, one line: done <sha>, report <path> (or BLOCKED: ... / PUSH REJECTED ...).

Attribution: Co-Authored-By: Claude Opus 5.5 noreply@anthropic.com Claude-Session: https://claude.ai/code/session_01GFeMqxRbtUMiGVyDMxsvEq

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