myxce/CLAUDE.md

# OpenWolf

This project uses OpenWolf for context management. The always-on rules live in `.claude/rules/openwolf.md`; the hooks handle bookkeeping (anatomy index, memory log, read tracking) automatically.

For the full operating protocol (session handoff, memory discipline, bug logging), load the `openwolf` skill, or read `.wolf/OPENWOLF.md`. Regenerate the session handoff with `/handoff`.


# XCE Cluster Management System

## Project Overview
XCE is an HPC cluster management system — Go API/CLI tier fronting C daemons (controller, worker, scheduler). Full context in `.kiro/steering/product.md`.

## Engineering Guide

For details on any topic below, read the corresponding steering file in `.kiro/steering/`. CLAUDE.md provides pointers, not duplicates.

| Topic | Steering File |
|-------|---------------|
| Project purpose, HA phases, design decisions | `product.md` |
| Technology stack, build systems, key decisions | `tech.md` |
| Directory layout, naming conventions, test org | `structure.md` |
| Build commands, Nix flake, deploy, AppImage | `build-deployment.md` |
| REST handler pattern, daemon opcodes, Cap'n Proto | `api-standards.md` |
| HA protocol, async I/O, Raft election, heartbeat | `ha-async-io.md` |
| TDD rules, C + Go test patterns, coverage targets | `testing.md` |
| Error handling: Go ReturnError, C errnox, zap logging | `error-handling.md` |
| RBAC, JWT, auth backends, input validation, secrets | `security.md` |
| WAL durability, recovery, save/restore field-completeness | `persistence.md` |
| Real vs. virtual resources, reservation-vs-usage accounting (mem) | `resource-accounting.md` |
| Resource model: attributes / counters / instances+claims, providers, K8s-LSF mapping, LLM direction | `resource-model.md` |
| Resource design decisions, proposals and open questions (discussion log) | `resource-questions.md` |
| Job/app-profile/queue/project ownership and merge rules | `job-config-layering.md` |

## Key Rules (from steering — summarized for quick reference)

- **TDD mandatory**: red → green → refactor; test in `testsuite/` before C changes, `_test.go` before Go changes
- **Async I/O**: delaymgr is trigger-only and must never block (no `connect()`, no file I/O) — it drives heartbeats/election timeouts, so blocking there causes spurious failover. Long/unbounded blocking goes on the slow lane; bounded blocking in vtask handlers is permitted only under an admission reservation (`COMMIT_WAIT_RESERVED`). `xce_request`/`xce_reply` are always non-blocking. See `ha-async-io.md`
- **Connections are long-lived**: closing signals RDHUP failover. Inbound connections are vote-only; outbound carry all state push
- **No fork in multi-threaded processes**: controller, scheduler, `xcecd` and anything that starts libxce threads never call `fork`/`vfork`/`daemon`/`system`/`popen`/`uv_spawn`; start children with `posix_spawn()` or a systemd unit. A process proven single-threaded (`xcecd_worker`) may fork, marked `/* xce-fork-ok: <why> */`. Tests, harness, autoscaler and Go are out of scope; enforced by `scripts/check-no-fork.py` (meson test + pre-commit). See `tech.md` "Process Creation"
- **Middleware chain** (non-negotiable): WhitelistURL → WhitelistIP → RateLimit → JWT → CORS → RBAC
- **Error pattern**: `ReturnError(code, msg, nil); return` — early return on every error
- **Build**: `/xce-build [component]` — debug + ASAN + tests. Components: `all` (default), `lib`, `controller`, `harness`, `scheduler`, `worker`, `apiserver`, `xcecli`, `xceadmin`. See `build-deployment.md` for full commands
- **Buglog**: each bug is a Markdown record `.wolf/bugs/<id>.md` written to the standard in `.claude/skills/buglog/bug-record.md` (Description, Environment incl. OS/libc/toolchain/commit, Reproduction; Root cause, Fix, Verification and fix commits once fixed). Create and change records only through the `buglog` skill (`scripts/buglog.py new | status | note | recur | check | list --open`), which enforces the standard (so does the pre-commit hook); `.wolf/buglog.json` is a generated index, never edit it. The front-matter `status` is the only source of truth for open/closed (values in `.claude/rules/buglog-status.md`); after a fix commit run `scripts/buglog.py status <id> fixed --commit <sha>`
- **Save/restore field-completeness**: any persistence mechanism (WAL fact, scheduler snapshot, checkpoint) must capture every field of the entity it claims to persist — a state that "recovers correctly" while silently missing a field it depends on (e.g. `job.state` correct but `job.allocs` lost) is a bug, not an acceptable simplification, unless the omission is explicitly documented as a scope decision (see `persistence.md`'s "Snapshot Save/Load Field-Completeness" + `APPLY_CLEAN`/bug-1678 sections). When adding or extending save/restore logic, verify the field round-trips through BOTH the write side and every read/apply seam, and run `/xce-audit-invariants` (controller dimension 7 / scheduler dimension 4) rather than assuming a passing test suite already proves it — `APPLY_CLEAN`-style verdicts check row counts and cursor position, not per-field completeness

## Key Files
- `src/tools/xce-build.sh` — primary build/test orchestration (Meson-based; see `build-deployment.md`)
- `src/frontend/apiserver/cmd/main.go` — server startup, init sequence
- `src/frontend/apiserver/router/routers.go` — all routes and middleware chain
- `src/frontend/apiserver/controllers/rbac_check.go` — RBAC loading and enforcement
- `src/frontend/apiserver/config/rbac.yaml` — role/permission definitions
- `src/frontend/apiserver/config/auth.yaml` — auth provider selection

## Subdirectory Guidelines
- `src/frontend/` — See `src/frontend/CLAUDE.md`
- `src/controller/` — See `src/controller/CLAUDE.md`
- `src/harness/` — See `src/harness/CLAUDE.md`
- `src/worker/` — See `src/worker/CLAUDE.md`
- `src/scheduler/` — See `src/scheduler/CLAUDE.md`
- `src/lib/` — See `src/lib/CLAUDE.md`

# Agentic SDLC and Spec-Driven Development

Kiro-style Spec-Driven Development on an agentic SDLC

## Project Context

### Paths
- Steering: `.kiro/steering/`
- Specs: `.kiro/specs/`

### Steering vs Specification

**Steering** (`.kiro/steering/`) - Guide AI with project-wide rules and context
**Specs** (`.kiro/specs/`) - Formalize development process for individual features

### Active Specifications
- Check `.kiro/specs/` for active specifications
- Use `/kiro-spec-status [feature-name]` to check progress

## Development Guidelines
- Think in English, generate responses in English. All Markdown content written to project files (e.g., requirements.md, design.md, tasks.md, research.md, validation reports) MUST be written in the target language configured for this specification (see spec.json.language).

## Minimal Workflow
- Phase 0 (optional): `/kiro-steering`, `/kiro-steering-custom`
- Phase 1 (Specification):
  - `/kiro-spec-init "description"` — initialize spec scaffold
  - `/kiro-spec-quick "description"` — fast single-pass spec (requirements + design + tasks, no approval gates)
  - `/kiro-spec-batch` — generate specs for all features in a roadmap in parallel
  - `/kiro-spec-requirements {feature}`
  - `/kiro-validate-gap {feature}` (optional: for existing codebase)
  - `/kiro-spec-design {feature} [-y]`
  - `/kiro-validate-design {feature}` (optional: design review)
  - `/kiro-spec-tasks {feature} [-y]`
- Phase 2 (Implementation): `/kiro-impl {feature} [tasks]`
  - `/kiro-validate-impl {feature}` (optional: after implementation)
  - `/kiro-verify-completion {feature}` — validate all acceptance criteria are met
- Debugging: `/kiro-debug {feature}` — systematic debugging with spec context
- Code review: `/kiro-review` — review implementation against spec requirements
- Progress check: `/kiro-spec-status {feature}` (use anytime)

## Development Rules
- 3-phase approval workflow: Requirements → Design → Tasks → Implementation
- Human review required each phase; use `-y` only for intentional fast-track
- Use `/kiro-spec-quick` for small, well-understood features; full workflow for anything touching HA/persistence/RBAC
- Keep steering current and verify alignment with `/kiro-spec-status`
- Follow the user's instructions precisely, and within that scope act autonomously: gather the necessary context and complete the requested work end-to-end in this run, asking questions only when essential information is missing or the instructions are critically ambiguous.

## Steering Configuration
- Load entire `.kiro/steering/` as project memory — all `.md` files are authoritative
- Core: `product.md`, `tech.md`, `structure.md`
- Custom: `testing.md`, `error-handling.md`, `security.md`, `ha-async-io.md`, `api-standards.md`, `build-deployment.md`, `config-design.md`, `persistence.md`, `resource-accounting.md`, `resource-model.md`, `resource-questions.md`, `job-config-layering.md`, `roadmap.md`
- Add new custom files via `/kiro-steering-custom`; sync existing via `/kiro-steering`