agent: builder model: opus max_turns: 220 budget_usd: 45 —
scalar::from with a precondition) from the uncommitted work of y4-1003-scalar-fromy4-1003-scalar-from.md (read it whole: decision, steps, done-when) ran out of turns at step 1 and committed nothing. Its work lies uncommitted in this checkout and is yours to take over (no other agent runs in this lane): crates/nikaia-std/src/num.rs, std.contracts, tools/{check_walked,emit_below,prover_state,prover_walk}.nika and their lowered/*.rs, docs/specification/10-nikaia-light.md, packages/json/src/main.nika, scripts/grammar_arrow.nika, tests/compiler/tests/scalar_from_a_proved_code_point.{nika,stdout}. Do not stage docs/briefs/yaml/cost.txt/tokens.txt (the driver’s). Read docs/briefs/yaml/y4-1003-scalar-from.debrief.md first: it says what is built and where the cost went.
State per the debrief: scalar::from exists (contract requires, Rust helper num::scalar_from, emitter mapping, scalar without a use); the prover now reads std’s preconditions (scalar::from(0xD800) is NK1207). Missing:
scalar::from, std preconditions reaching the prover, the Part I text, the new test. If the partial work does not pass the gate as is, finish 1b first and commit both together.std precondition is a claim like a program’s assert (ADR-269 D5/D20, ADR-380 D1): refused with NK1300 under unproved-claims = "error", checked at run time under "warn", listed by --asserts - also where it passes through a function the program wrote (fn g(n: i64) -> scalar { return scalar::from(n) }: the precondition becomes g’s, proved at g’s callers, as for any assert). Values that arrive from outside are checked where they arrive, by design (Part I main’s preconditions) - not a missing refusal. Locations: prover_walk.nika (the foreign lookup), check_claims.nika, prover_state.nika. Test beside step 1’s: an unproved call refused (.stderr), and one through a helper proved at its caller.grammar_arrow, rs2nika, old test moves; the json and grammar_arrow edits are already made and check clean per the debrief).u8 as scalar). NK1241 is listed in Part I but no compiler code emits it: emitting it for this refusal is fitting (an as that can lose a value); if its listed meaning does not cover this, ask under Needs:, do not invent a code. Last commit Fixes #1003.Facts the first run paid for: scalar is a prelude alias of Rust’s char (no Rust module scalar; the emitter maps the call); scalar counts as a module in check_walked.nika because of keys like scalar::to_string; requires in std.contracts had never been used before; rs2nika already writes (x as u8) as scalar.
Budget: if 1b turns out larger than this run, commit 1a and the finished parts, report Result: partial with exactly what is missing - never leave work uncommitted at the end.
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).cargo fmt, cargo clippy --all-targets -- -D warnings, scripts/pre-push-check.sh, and the gate of .claude/agents/builder.md (#852).CHANGELOG.md, badges; no new NK code. New tests in Nikaia only; never the full suite. No foreground sleep, no polling; scripts in files.std or the toolchain lacks stops the work: no code around it unless an ADR or Part I-III refuses it (name it). Else Result: blocked, Found: gap + probe, Needs: owner decision (CLAUDE.md, A missing form stops the work).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.Pushed: line names the pushed sha. A report without a Pushed: line, or with a placeholder left in (TC, DISK), is not done and cuts the batch (k3a1 2026-10-29: Result: done, nothing committed).NIKAIA_CACHE_LIMIT=2G target/fast/nikaia test --project packages/yaml green, and cargo test --profile fast -p nikaia --test it -- fmt::every_nika_file (it formats every .nika under packages/). For a change only under packages/yaml/ this is the gate the line above asks for; a change under crates/ runs the gate of .claude/agents/builder.md (#852) as well. target/fast/nikaia is built by the session hook; if it is missing, cargo build --profile fast -p nikaia once.Changelog: none, unless the brief changes crates/.packages/yaml/ and the brief’s own report, unless the brief names it; never docs/briefs/batch.txt or a brief of another lane./home/user/Nikaia/docs/briefs/yaml/y4b-1003-scalar-from-continue.md.report.md)Fields of docs/architect.md, Briefs and reports: Result: done|noop|partial|blocked (the bare word alone on that line: Result: done, never a summary after it, which cuts the batch, b869a 2026-10-27; Owner: is a question for the owner or none, never a role), Files, Commit, Body (optional, one paragraph for the commit message), Fixes, Pushed, Tests, Gate (green|red), Deviation, Found, Needs, Changelog, Owner, Disk freed, and for a move Rs2nika: (the kept N of M lines of rs2nika --score, then the three costliest hand edits; none for a task that moves no Rust, none (redesign) for a brief with Shape: redesign and no Convert: line). none where nothing, and then the bare word: Deviation: none (a note) cuts the batch (batch.nika compares exactly); a note goes into the commit message. Found: is only for a defect outside your change (it cuts the batch); a process event such as another session resetting or rewriting your files is no Found:, it goes under Needs: (m3a 2026-10-28); a converter draft that came out wrong is no Found:, it is one of the costliest edits under Rs2nika:, which the converter lane reads (e12-4b 2026-10-27); how you solved your own step goes into the commit message. Deviation: is only a step of the brief built otherwise than written or not built (a choice the brief left to you, such as keep what X needs and say so, is no deviation: it goes into the commit message; nor is building two steps in one commit when every step is built, e12-3a 2026-10-27, nor a step another commit on develop already built, shown by your test failing with that commit’s change reverted, b889 2026-10-27: name the commit in Body:, nor a test’s expected .stdout/.stderr taken from what the program really prints where the brief’s sketch of it was short or wrong, b934 2026-10-29: say so in Body:, nor a lowering that follows the ADR governing it where the brief’s expected lowering contradicts that ADR, b933 2026-10-29: name the ADR in Body:, nor re-keying an allow-list entry (KNOWN) whose hash changed for the same program and the same reason, b-fixforward-sweep2 2026-10-28: say so in Body:); how you verified (e.g. a test not run against the unfixed compiler) goes under Tests:. A noop says why under Tests: (what was probed), not under Deviation:. 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_01UVxJDveRM5qKZKyCqq6Y24