left4me/AGENTS.md

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# AGENTS.md
Guidance for coding agents working in this repository.
## Mission
Build `left4me` according to the two implementation plans:
- `docs/superpowers/plans/2026-04-22-l4d2-host-lib-v1.md`
- `docs/superpowers/plans/2026-04-23-l4d2-web-app-v1.md`
Do not invent architecture outside these plans unless explicitly requested.
## Current Project State
- `l4d2host/` and `l4d2web/` implementation directories exist.
- Implementation plans remain the source of truth for contract changes and task sequencing.
## Non-Negotiable Constraints
### Workspace and tools
- Do not use git worktrees.
### Naming and boundaries
- Use `l4d2` naming consistently.
- Keep host library and web app as separate components.
- Do not collapse them into one package.
### Host library (`l4d2host` / `l4d2ctl`)
- Exposed CLI write command set is fixed:
- `install`
- `initialize <name> -f <spec.yaml>`
- `start <name>`
- `stop <name>`
- `delete <name>`
- CLI read commands are allowed for web/host boundary consistency:
- `status <name> --json`
- `logs <name> --lines <n> --follow/--no-follow`
- Runtime paths are rooted at `LEFT4ME_ROOT`, defaulting to `/var/lib/left4me`.
- Deployment/config management owns global units under `/usr/local/lib/systemd/system` and privileged helpers under `/usr/local/libexec/left4me`.
- Overlays are external directories (no overlay content management here).
- Fail-fast subprocess behavior; pass raw stderr; propagate return code.
- No lock manager, no rollback, no preflight runtime checks.
- Delete missing instance/runtime dirs must succeed (no-op).
- Read APIs required for web app integration:
- `get_instance_status(name)`
- `stream_instance_logs(name, lines=200, follow=True)`
### Web app (`l4d2-web-app`)
- Flask + server-rendered templates + vendored HTMX.
- No external frontend framework/dependencies.
- Custom CSS with tokenized, consistent link and accent colors.
- Local username/password auth and `admin` flag.
- Persist command logs in `job_logs` table (retain indefinitely).
- Desired vs actual server state model.
- Live logs in UI for both jobs and servers.
- Web app host operations go through `l4d2ctl` via a host command client, not direct `l4d2host` imports.
- Blueprint semantics (locked):
- private per user in v1
- live-linked to servers
- no server-level overrides
- deleting in-use blueprint is blocked
- updates apply on next action
- servers can reassign blueprint anytime
## Delivery Workflow
1. Read both plan files fully before coding.
2. Execute plan tasks in order.
3. Keep changes scoped to one task at a time.
4. Run task-level tests before moving forward.
5. Do not claim completion without command evidence.
6. Keep docs updated when behavior/contracts change.
## Verification Expectations
Before claiming success on any step, run the relevant command and report actual output status.
Typical commands (once components exist):
- `pytest l4d2host/tests -q`
- `pytest l4d2web/tests -q`
## Change Control
- If a requested change conflicts with this file, follow explicit user instruction.
- If plans and code diverge, update plans or flag the mismatch clearly.