pansy/CLAUDE.md

# CLAUDE.md

Working notes for Claude Code on pansy. [DESIGN.md](DESIGN.md) is the architecture
document and stays authoritative; this file is the operational stuff you'd
otherwise rediscover every session.

## This is a vibe-coded project — say so

**pansy is written by an LLM, with a human directing.** That is not a footnote,
it is a property of the software people should know before they trust it with
their garden plans.

Rules, not preferences:

- The README carries a prominent, near-the-top disclosure. It does not get moved
  below the fold, softened into "AI-assisted", or quietly dropped in a rewrite.
- If you rewrite the README, the disclosure survives the rewrite.
- Anywhere else the project introduces itself (a landing page, a docs site, a
  package description), it says the same thing.

If you find yourself editing that section, the only acceptable direction is
clearer and more honest, never quieter.

## Keep the docs true

Docs rot silently and nobody notices until someone follows them and it doesn't
work. Treat them as part of the change, not follow-up work:

- **README.md** — update it in the *same commit* whenever you add or change an
  environment variable, a route worth knowing about, a build or run command, or
  anything in the Docker/Compose example. The env var table and the compose
  snippet are the two things people copy, so they're the two that hurt most when
  they're stale.
- **DESIGN.md** — update it when the architecture actually changes: a new table,
  a new package, a new API surface, a decision that supersedes one written there.
  Not for every implementation detail.
- **CLAUDE.md** — this file. Add a convention here the moment you find yourself
  rediscovering it.
- **Examples must run.** If you change something an example depends on, fix the
  example. A snippet that references an issue number as "once #5 lands" after #5
  has landed is a bug in the docs.

When you touch a file, glance at whether the comments around your change are
still true. Stale comments are worse than none — the next reader believes them.

## Build and test

pansy is a standalone Go module inside a parent workspace, so **`GOWORK=off` is
required** or the build picks up sibling modules:

```sh
GOWORK=off go build ./...
GOWORK=off go test ./...
cd web && npx tsc --noEmit && npx vitest run && npm run build
make test          # both halves
make build         # web bundle → embed → CGO_ENABLED=0 static binary
```

`gofmt -l internal/` before committing. Note `internal/service/plants_test.go` is
already unformatted on `main` — leave it alone unless you're touching it, so the
diff stays about your change.

## Architecture in one paragraph

`internal/store` (hand-written SQL, `modernc.org/sqlite`, pure Go) →
`internal/service` (**the seam: every permission check and invariant**) →
`internal/api` (thin gin handlers: decode, call service, encode). Agent tools in
`internal/agent` are equally thin adapters over the *same* service methods, so
they inherit permission enforcement for free. If you are about to put a rule in a
handler, put it in the service instead.

Frontend: React 19 + Vite + Tailwind 4 + TanStack Router/Query, built into
`internal/webdist/dist` and embedded with `embed.FS`.

## The look comes from a handoff — don't improvise it

The frontend implements `docs/design_handoff_pansy_ui/` (read its README before
touching anything visual; the `.dc.html` files there are references, not code).
Conventions that follow from it:

- **Tokens live in two places, on purpose.** Light values in
  `web/src/styles/index.css` (`@theme`, same names as the handoff's
  `styles.css`); dark values ONLY in the bootstrap script in `web/index.html`.
  A new color goes in both; a raw hex in a component is wrong. Tailwind's shadow
  utilities inline their values and can't follow the runtime override — use
  `.elev-sm/md/lg` instead.
- **The component classes are in index.css** (`.btn`, `.input`, `.tag`, `.seg`,
  `.toggle`, `.chip`, `.panel`, `.dialog`). Use them with Tailwind utilities for
  layout rather than restyling a pill from scratch.
- **The editor's breakpoint is container width** (`PHONE_BREAKPOINT` = 760 in
  `web/src/editor/shared.ts`, measured with a ResizeObserver), not a media
  query. One component tree, two chromes; don't build a second page.
- **Plant markers are monograms** derived from the name (`web/src/lib/monogram.ts`);
  the collision set is the whole catalog so the letters match everywhere.
  `plant.icon` still exists in the API but nothing renders it.
- **Season plans are a naming convention** (`web/src/lib/plan.ts`): a copy named
  `<garden> — <year>` is that garden's plan. The API keeps no link; renaming the
  copy quietly makes it a plain garden, which is fine.
- **Tap-to-place makes a one-plant plop** (radius = spacing/2, per the handoff);
  "Fill the bed" (rows / clumps) is the bulk tool. Fill geometry still follows
  the clump rules below — different tools, not a conflict.
- **Undo in the header re-reads history before reverting.** The cached list
  trails the canvas right after a placement, and undoing the step *before* the
  one you meant is the worst thing an undo button can do. Keep it that way.
- **Checking a change against the handoff:** run the API on a scratch DB
  (`PANSY_PORT=8099 PANSY_DB=/tmp/x.db GOWORK=off go run ./cmd/pansy`) plus
  `PANSY_PORT=8099 npx vite` in `web/`, seed through the API, and drive the
  Playwright MCP at 1280×800 and 390×844. Its screenshots must be named under
  `.playwright-mcp/` (gitignored) or it writes them into the repo root.

## Conventions that bite if you miss them

- **Everything is centimeters**, stored as SQLite `REAL`. Imperial is a display
  and entry concern only, in `web/src/lib/units.ts`. Two distinct scales live
  there: *dimension* (m/ft — gardens, objects, the garden grid) and *spacing*
  (cm/in — plant spacing, bed grid). Mixing them is what #47 was about.
- **Optimistic concurrency everywhere.** Every mutable row has `version`; PATCH
  and DELETE carry it; the store returns `(current row, ErrVersionConflict)` on
  mismatch and the API answers 409 with the row under `"current"`.
- **No-access is `ErrNotFound`, not `ErrForbidden`.** Existence is masked
  deliberately. `ErrForbidden` means "you can see it but may not do that".
- **Plops (plantings) live in their parent object's local frame**, origin at the
  object's center, `-y` is north. Moving or rotating a bed moves its plants free.
- **A plop is a clump, not a plant.** `defaultPlopRadius` is `1.5 × spacing`, so a
  plop is three spacings across and holds `π·r²/spacing²` plants. Reasoning about
  fills as if one plop were one plant gets the geometry wrong every time — which
  is how #75 happened: requiring the whole circle inside the bed inset the outer
  row by 1.5 spacings when the horticultural rule is *half* a spacing. Spacing is
  a constraint between neighbouring plants; a bed edge is nobody's neighbour.
- **Soft removal**: "clear bed" sets `removed_at`; the editor reads
  `removed_at IS NULL`. Hard delete is a different operation.
- **Length fields keep centimeters as the source of truth.** A dialog field
  that takes a length is a `LengthField` (`web/src/lib/units.ts`): the text is
  a view, `cm` changes only when the person types. Never re-parse the display
  string on save — "29′ 6.3″" is the nearest tenth of an inch, and parsing it
  back is how a no-change Save turned 900 cm into 899.922 (and bumped the
  version, and wrote a bogus history entry). The inspector still keeps display
  strings but gets the same result by refusing to commit text that still equals
  the formatted original (`commitDim`); either way, a no-op save sends exactly
  what was loaded — or nothing.
- **"Today" is the browser's local day**, from `today()` in
  `web/src/lib/dates.ts`, and the UI always sends it: journal `observedAt`,
  plop/fill `plantedAt`, `removedAt`. The server's UTC default is only for
  API callers and the agent. A gardener placing at 9 pm in Ohio planted today,
  not tomorrow — don't add a UI path that leaves the date to the server.
- **A wrapped `ErrInvalidInput` is shown to the person verbatim.**
  `fmt.Errorf("%w: chat model %q: unknown provider", domain.ErrInvalidInput, spec)`
  reaches the client as the 400's message (minus the sentinel prefix); the bare
  sentinel reads "invalid input". Write the reason for the keyboard, not the log.
- **Migrations** are numbered `.sql` files in `internal/store/migrations/`, run
  at startup, embedded. Never edit one that has shipped.
- **Every service mutation lands in history** (#48). If you add one, record it —
  see `internal/service/revisions.go`. Multi-row operations pass all their
  changes to a single `record` call so they undo as one unit.
- **The history write is detached from cancellation on purpose.** `commitScope`
  calls `context.WithoutCancel` — that is not a mistake to tidy up. By the time
  a commit runs, the rows it describes are already written, so cancelling it
  cannot undo anything; it can only leave real changes with no way to undo them.
  This was a live bug twice (#73): a client disconnect mid-request orphaned 18
  plantings. Fixing it per-call-site is how it came back, which is why the rule
  lives in `commitScope` where no caller can forget it.

- **Request deadlines are extended through `responseController(c)`, never
  `http.NewResponseController(c.Writer)`.** The logging middleware wraps the
  writer in a type with no `Unwrap`, so a controller built from a handler's
  writer can't reach the socket: every `SetWriteDeadline`/`SetReadDeadline`
  returns `ErrNotSupported` — in production only. `captureController` is the
  first middleware in `api.New` precisely so the controller exists before
  anything wraps the writer. Corollary for tests: a deadline test must run
  through `New()`, not `gin.New()` — the #78 fix shipped fully tested on a bare
  engine and never worked on the live instance.

## Testing

Match the test to the failure it would catch:

- **Anything addressed by its own id needs an API-level test through the router.**
  Service tests can't see a route that was never registered — PATCH/DELETE
  `/journal/:id` once shipped fully implemented, fully unit-tested, and
  completely unreachable.
- **Watch for fixtures that assert your assumptions instead of the API.** A test
  for the undo message passed because the fixture I wrote populated a field the
  real response leaves empty. If a test builds the thing it's testing against,
  it is checking your mental model, not the system.
- Some things only real use finds. The agent's whole loop is covered by
  majordomo's scriptable fake provider (`provider/fake`), which is worth using —
  but the three worst v2 bugs all turned up in one live session afterwards.

## Workflow

Branch → PR → **Gadfly** reviews it automatically → consider every finding and
fix what's real → merge when the pipeline is green. Do not grade Gadfly findings.
A push to `main` builds the image and deploys to Komodo; the live instance at
`pansy.orgrimmar.dudenhoeffer.casa` updates a few minutes later.

**One sweep, not a loop.** Take Gadfly's *initial* review, fix what's real, and
merge once the build is green. Do NOT re-trigger Gadfly on the fix commits and
wait for it again — a re-review-per-fix loop burns ~10 min a pass and drags a
small PR out for an hour (Steve's explicit call, 2026-07-22). The initial review
is the check; your own build/test/judgment covers the fixes. Gadfly is advisory
and never blocks merge, so green build + fixes applied is enough.

(Mechanics, if you ever *do* need a manual re-run: the workflow triggers on
`opened`/`reopened`/`ready_for_review`, not `synchronize`, so pushes don't
re-review; a `@gadfly review` comment does. A comment without that exact phrase
still runs and exits green in ~2s — a skip that looks like a pass, so judge a
real review by its ~10-min duration, not its status. Gadfly edits its consensus
comment in place, so `updated_at` moves but `created_at` doesn't.)

Workflow- and config-only changes (CI, this file, docs) go straight to `main`
without the PR dance.

Planning happens in Gitea issues first: standalone issues under a tracking epic,
implemented in later per-issue sessions.

## Environment

`PANSY_PORT`, `PANSY_DB`, `PANSY_BASE_URL`, `PANSY_REGISTRATION`,
`PANSY_LOCAL_AUTH`, `PANSY_OIDC_*` — note it's `PANSY_DB` and `PANSY_PORT`, not
the `_PATH`/`_ADDR` names you might guess. Authentik is the primary IdP;
OIDC-first with local passwords as fallback.

Agent config: `OLLAMA_CLOUD_API_KEY`, `PANSY_AGENT_MODEL` (default
`ollama-cloud/glm-5.2:cloud`) and `PANSY_AGENT_ENABLED`, set in Komodo. Model
strings pass verbatim to `majordomo.Parse`, so a comma-separated spec gives
failover for free — don't parse that grammar in pansy.

The model and enabled flag are also **admin-editable at runtime** in Settings
(#79); the env vars are just defaults (precedence: DB setting → env → default).
Two things this makes load-bearing:

- **The live Runner is hot-swapped, not built once.** It sits behind an
  `atomic.Pointer` in `internal/api` (`agentHolder`), and its routes are
  registered *unconditionally* with a nil-check on `agent.get()`. Do NOT go back
  to registering the chat routes only when a key is present — a settings change
  has to be able to turn the assistant on without a restart, which a missing
  route can't. `/capabilities` reads the pointer, so it reflects the live state.
- **`OLLAMA_CLOUD_API_KEY` stays in the environment, never the DB.** Model
  selection is a setting; the key is not. A secret in `instance_settings` lands
  in every backup and in the undo history's blast radius. The Settings API
  reports whether a key is *present*, never its value.
- The "how to turn a spec into a model" knowledge lives once in
  `internal/agentmodel`, imported by both `agent` (to run) and `service` (to
  validate a spec before storing it). It can't live in `agent` — `agent` imports
  `service`, so a `service`→`agent` import would cycle.

`majordomo` is a **real dependency** now, resolved from the Gitea instance as a
pseudo-version. There is no `replace` directive and there must not be one: a
`replace` pointing at `../majordomo` builds on your laptop and breaks the Docker
build, which has no sibling checkout. `executus` is a sibling repo at `../` and
is not a dependency.

The `majordomo` build tag is **gone**. Don't reintroduce it — an untagged CI that
never compiles the agent is worse than a slightly larger binary.