ai-engineering

Imported from billosys/ai-engineering (AGENTS.md). Install upstream with npx skills add billosys/ai-engineering. Copyright stays with the author.

ai-engineering - standing session instructions

ai-engineering: public Billosys repository for AI-optimized engineering skills, the collaboration framework, domain knowledge packs, and the Composite Cognition Dispatch Protocol (CCDP). The repo is both a source tree for framework documents and a packaging surface for installable assistant skills.

• Planning artifacts live on the dedicated planning branch/worktree, not on the implementation branch. Use git worktree list to locate it. If it is not present locally, inspect or create the canonical .worktrees/planning checkout only after confirming that the repository does not already have a different worktree convention. Do not recreate planning docs on main.
• Use the current collaboration-framework skill at session start. For planning work, read knowledge/project-management/SKILL.md, then knowledge/project-management/guides/README.md as the wayfinder, and then load the relevant knowledge/project-management/guides/ files. The current canonical layout is projectNN-<slug>/project-plan.md plus project ledger.md, arcNN-<slug>/arc-plan.md plus arc ledger.md, and per-slice slice-plan.md, ledger.md, cc-prompt.md, closing-report.md, workflow-specific verification records, and artifacts/ for durable slice-produced artifacts unless the operator records an override. Preserve existing cdc-verification.md records and project conventions under the planning guide's verification filename compatibility rule; do not rename historical records or leave competing current verdicts. Slice records are cdc-verification.md by default and crc-verification.md with three contributors; three-contributor arc/project closure requires both CRC and CDC records under the per-scale record contract.
• Default to the Two-Contributor Workflow (CDC + CC). Enable the Three-Contributor Workflow (CDC + CRC + CC) only on explicit Operator request, recorded with scope, role assignments, and authority in the canonical plan. Follow knowledge/engineering-methods/guides/01-engineering-methodology.md. CRC escalates structural changes via crc-escalationNN.md; CDC returns cdc-directiveNN.md, both relayed by the Operator and preserved under the planning guide's design handoff contract. Neither workflow permits self-acceptance or silent changes to the agreed contract.
• The Operator may explicitly select the One-Contributor Workflow for bounded single-assistant work. Use proportionate self-checks and a completion report, not fictional role handoffs or new planning trees solely for the workflow. Existing ledgered work and independent/Operator gates remain binding; do not present the sole contributor's self-review as independent verification.
• Preserve issued slice prompts. Keep the initial cc-prompt.md and every follow-up cc-prompt-iterationNN.md in the slice root, never in artifacts/. Record the current assignment and prior handoffs in slice-plan.md; follow knowledge/project-management/guides/03-planning-top-down.md for iteration handoff and execution. Supporting-artifact overrides do not change prompt placement.
• Before implementation or slice/arc closure, read the active project-plan.md from the planning worktree first, then the relevant arc-plan.md, slice slice-plan.md, and ledger files. Treat closing-report.md as proposed-done until the required workflow-specific records, a recorded legacy path, or an equivalent independent verification artifact closes the ledger evidence.
• Skill versioning: follow the repository-wide contract below for every skill, including domain/tooling skills, framework components and composers, and method skills. Guides and templates do not have independent versions.
• Work-verification routes: use knowledge/work-verification/guides/01-ledger-discipline.md as the primary ledger-discipline load path, then load the focused evidence-strength, row-closure, silent-drop, or independent-verification guides as needed. knowledge/work-verification/templates/LEDGER-DISCIPLINE.md remains a package-local full-protocol and copyable-table support asset.
• Testing routes: use knowledge/testing/guides/01-testing-discipline.md as the primary testing load path. Load 02-coverage-hardening.md for hard coverage-threshold work and 03-validation-gates.md for repository-native test/lint/format/package validation gates. The old CODE-COVERAGE.md path is not a live route.
• Code-auditing routes: use knowledge/code-auditing/guides/01-audit-scope-and-map.md as the primary diagnosis-only audit load path. Load 02-findings-and-severity.md for report and finding format, 03-scale-aware-auditing.md for all-scale review, 04-modernization-synthesis.md for evidence-backed modernization pressure, and 05-audit-to-hardening-handoff.md for follow-up testing or hardening work. The old CODE-AUDIT.md path is not a live route.
• Agent-coordination routes: use knowledge/agent-coordination/guides/01-when-to-delegate.md as the primary delegation-boundary load path. Load 02-context-packets.md for self-contained lookup packets, 03-result-integration.md for parent-context evidence integration, and 04-anti-patterns.md for delegation failure modes. The old SUBAGENT-DELEGATION-POLICY.md path is not a live route.
• Contribution-style routes: use knowledge/contribution-style/guides/01-contribution-style.md as the primary maintainer-facing voice and calibrated-claim guidance. Load 02-upstream-ticket-workflow.md for local draft, filing, line-reference, blockquote-header, paste-boundary, cross-linking, and template-use mechanics. knowledge/contribution-style/templates/CONTRIBUTION-TICKET.md remains a package-local authoring template, not a guide. The old CONTRIBUTION-STYLE.md path is not a live route.
• Load the relevant domain skill before writing or reviewing domain material: Rust, Go, Erlang/OTP, C++, JavaScript/Deno, Cobalt, Tailwind CSS, Visual Design, Biome, or Deno lint. Preserve source material under knowledge/<domain>/sources/ as provenance; write derived guidance in the domain SKILL.md and guides/ unless a local plan says otherwise.

Skill version and history contract (repository maintenance only)

This is how ai-engineering maintains its own skills. Keep these maintenance instructions in AGENTS.md; do not copy them into distributed skills, guides, templates, or end-user documentation. They supersede older per-document or framework-only versioning instructions and examples. Historical plans and existing nonconforming files are evidence, not exceptions to this contract.

• One authority: a skill's current version has exactly one authoritative value, metadata.version in the YAML frontmatter of its own SKILL.md. Write it as the version string inside the metadata mapping. Read that value before an update. Neither a history heading, prose label, Git release tag, nor another skill's version determines this skill's current version. Do not add a top-level version, a literal dotted YAML key named metadata.version, or another version authority.
• Why the nesting matters (confirmed 2026-09-06): the installed skill-creator validator, ~/.codex/skills/.system/skill-creator/scripts/quick_validate.py, permits only name, description, license, allowed-tools, and metadata at the frontmatter's top level. It rejects top-level version and accepts version inside metadata. The nesting is a compatibility requirement, not evidence of multiple versions; do not flatten it merely because there is one version. Keep other custom fields inside metadata too. Recheck the actual validator before revising this convention; our own gate must not enforce a schema that the skill-creator validator rejects.
• One history: each skill has exactly one version-history.md, sibling to its SKILL.md. That file records significant changes across the whole skill directory: the entrypoint, guides, templates, examples, and any other owned material. It is the change record, not the authority for the current version. Include an entry matching the current metadata version and retain previous entries; do not infer the current version from ordering or the largest number. Do not keep additional history files or embedded change-history sections in the entrypoint or descendants. A link to the sibling history is sufficient.
• One version sequence per skill: record significant changes under the owning skill's version, including changes confined to a guide or template. Update the metadata and corresponding history entry together when bumping the skill version. Do not continue independent guide/template version sequences or automatically bump the collaboration-framework composer for every component edit; assess each affected skill's own change.
• No duplicate skill version numbers: current and previous skill version numbers may appear only in the owning entrypoint's version metadata and its sibling history. Do not repeat them in entrypoint prose, headings, footers, badges, filenames, directory names, guides, templates, examples, or other skill files. Generated packages must preserve this rule; synchronizing a duplicate from metadata does not make the duplicate permissible.
• Preserve the distinction from subject matter: language, dependency, tool, protocol, specification, and example-project versions are not skill versions. Preserve those references and upstream source provenance. Actual project/arc/slice plan histories and CCDP's own protocol history are separate from this skill contract. Preserve former local-document histories as explicitly retired lineage in the sibling history, not as live version sequences; do not invent mappings to skill releases without evidence.
• Reconciliation: when retiring competing skill/document version sequences, use the highest existing version from the entrypoint and sibling history (including local-document history moved there). Compare numeric components, not strings or decimal numbers; normalize omitted minor/micro components to zero. Preserve the old records with their original provenance.
• Bump guidance: use semantic major.minor.micro versions. Increment major for incompatible changes, minor for compatible new capabilities or guidance, and micro for compatible corrections or clarifications. Reset lower components when incrementing a higher one. Use judgment about significance and grouping; no rigid per-edit or per-commit bump cadence is required.
• Establish ownership before editing: identify the owning skill entrypoint and sibling history. Existing SKILL-*.md variants are skills too; sharing a source directory or shipping inside a composite does not exempt them. A shared directory with multiple entrypoints needs an explicit ownership and history migration decision, not an inferred shared skill version. Packaging copies do not create independent version authorities.
• Shared-root deferral (operator decision, 2026-09-06): keep the existing Biome source directory and guide sharing unchanged until the operator revisits skill-root design. Its sibling version-history.md has separate ## Skill: biome-js-linter and ## Skill: biome-linter sections, each with its own version entries matching its entrypoint. Record shared-guide changes in every affected skill's section. This is not a shared version sequence or a general exception allowing new shared roots.
• Verify the whole contract: for each affected skill, check the metadata, sibling history, and entire owned tree for additional histories, live local version sequences, and duplicate skill-version labels. Check packaged output too when packaging is affected. Description-length and Markdown-path checks alone do not establish version-contract compliance. Report existing gaps explicitly rather than treating the current layout as a compliant template. Run make test-skill-versions for checker changes and make check-skill-versions for source plus freshly generated package checks. make check-package-paths includes the version gate. The checker recognizes explicit skill/document version declarations; reviewers must still distinguish subject-matter references from disguised or ambiguous skill-version prose.

Workflow

• Repo home: billosys org, public, default branch main.
• Branching: direct-to-main is normal for this repo unless the operator asks for a branch, PR, or separate worktree. Keep planning work on the planning worktree and implementation/release changes on main.
• Compatibility instructions: keep CLAUDE.md as a symlink to AGENTS.md for tools that still look for the older filename. Edit AGENTS.md, not the symlink target via a separate copy.
• Commit footer convention (operator override, 2026-08-07): every future assistant-authored commit message includes these trailers: Co-authored-by: Codex <noreply@openai.com> and Co-authored-by: Billo AI <ai-engineering@billo.systems>.
• Build entrypoint: start with make help. Use Make-backed targets instead of hand-running packaging scripts when a target exists.
• Skill packaging: make all builds every zip; make collab-framework builds the framework bundle; make skills builds the per-domain bundles; make install installs into $(HOME)/.agents/skills unless INSTALL_DIR is overridden. Generated zips land under target/skills/; target/ and build/ are ignored release artifacts, not ordinary source changes.
• Validation: run make check-skills after any SKILL.md description or packaged-skill metadata change. Run make check-package-paths after changing packaged Markdown links, bundle contents, Makefile packaging lists, or assets/packaging/path-exceptions.tsv. The package-path gate may report accepted warnings; hard failures must be fixed or explicitly dispositioned.
• Packaging lists: when adding, removing, or renaming a skill or bundled document, update the relevant Makefile lists/targets, README skill-library documentation, and package-path exceptions in the same slice.
• CCDP: source chapters live under protocols/ccdp/src/; the assembled protocol is protocols/ccdp/composite-cognition-dispatch-protocol.md. Use make ccdp from the repo root, or make ccdp-rfc-strict inside protocols/ccdp, before treating protocol edits as complete.
• Ignored workbench outputs: workbench/ is ignored. For intended release notes, review packets, or durable analysis artifacts, inspect them directly and use git add -f only for the specific file(s) the operator wants committed.