giles
9dd9fb9c37
Design + ops scaffolding for the next phase of work, none of it touching
substrate or guest code.
lib-guest.md: rewrites Architectural framing as a 5-layer stack
(substrate → lib/guest → languages → shared/ → applications),
recursive dependency-direction rule, scaled two-consumer rule. Adds
Phase B (long-running stratification) with sub-layer matrix
(core/typed/relational/effects/layout/lazy/oo), language profiles, and
the long-running-discipline section. Preserves existing Phase A
progress log and rules.
ocaml-on-sx.md: scope reduced to substrate validation + HM + reference
oracle. Phases 1-5 + minimal stdlib slice + vendored testsuite slice.
Dream carved out into dream-on-sx.md; Phase 8 (ReasonML) deferred.
Records lib-guest sequencing dependency.
datalog-on-sx.md: adds Phase 4 built-in predicates + body arithmetic,
Phase 6 magic sets, safety analysis in Phase 3, Non-goals section.
New chisel plans (forward-looking, not yet launchable):
kernel-on-sx.md — first-class everything, env-as-value endgame
idris-on-sx.md — dependent types, evidence chisel
probabilistic-on-sx.md — weighted nondeterminism + traces
maude-on-sx.md — rewriting as primitive
linear-on-sx.md — resource model, artdag-relevant
Loop briefings (4 active, 1 cold):
minikanren-loop.md, ocaml-loop.md, datalog-loop.md, elm-loop.md, koka-loop.md
Restore scripts mirror the loop pattern:
restore-{minikanren,ocaml,datalog,jit-perf,lib-guest}.sh
Each captures worktree state, plan progress, MCP health, tmux status.
Includes the .mcp.json absolute-path patch instruction (fresh worktrees
have no _build/, so the relative mcp_tree path fails on first launch).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
108 lines
8.5 KiB
Markdown
108 lines
8.5 KiB
Markdown
# koka-on-sx loop agent (single agent, queue-driven)
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Role: iterates `plans/koka-on-sx.md` forever. Algebraic effects + multi-shot handlers — **the substrate-validation test for SX's effect system**. Every other guest works around effects ad-hoc; Koka makes them the primary computational model. The headline test is multi-shot resumption (`choose() -> resume(True) ++ resume(False)`) which exposes whether `cek-resume` is real or a single-shot stub. One feature per commit.
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```
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description: koka-on-sx queue loop
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subagent_type: general-purpose
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run_in_background: true
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isolation: worktree
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```
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## DO NOT START WITHOUT THE PREREQUISITES
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This loop **must not** start until both of the following are true:
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1. **lib-guest Steps 3, 4, 6 are `[done]`** — Koka's tokenizer consumes `lib/guest/lex.sx`, its parser consumes `lib/guest/pratt.sx`, its pattern matcher consumes `lib/guest/match.sx`.
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2. **ADT primitive (`define-type` + `match`) is live in the SX core** — required before Phase 2. Track via `plans/sx-improvements.md` Phase 3 (Steps 5–8) or its successor.
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**Pre-flight check:**
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```
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ls /root/rose-ash/lib/guest/lex.sx /root/rose-ash/lib/guest/pratt.sx /root/rose-ash/lib/guest/match.sx
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printf '(epoch 1)\n(define-type test-adt (A) (B v))\n(epoch 2)\n(match (A) ((A) "ok") (_ "no"))\n' \
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| /root/rose-ash/hosts/ocaml/_build/default/bin/sx_server.exe 2>&1 | tail -3
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```
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If any lib-guest file is missing OR `define-type`/`match` errors instead of returning `"ok"`, **stop and report**. Do not start.
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## Prompt
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You are the sole background agent working `/root/rose-ash/plans/koka-on-sx.md`. You run in an isolated git worktree on branch `loops/koka`. You work the plan's roadmap in phase order, forever, one commit per feature. Push to `origin/loops/koka` after every commit.
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## Restart baseline — check before iterating
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1. Read `plans/koka-on-sx.md` — Roadmap + Progress log + Blockers tell you where you are.
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2. Run the pre-flight check above. If either prerequisite is missing, stop immediately and update the plan's Blockers section with the specific gap.
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3. `ls lib/koka/` — pick up from the most advanced file that exists. If the directory does not exist, you are at Phase 1.
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4. If `lib/koka/tests/*.sx` exist, run them via the epoch protocol against `sx_server.exe`. They must be green before new work.
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## The queue
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Phase order per `plans/koka-on-sx.md`:
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- **Phase 1** — tokenizer + parser (consuming `lib/guest/lex.sx` + `lib/guest/pratt.sx`)
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- **Phase 2** — ADT definitions + match (consuming `lib/guest/match.sx`)
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- **Phase 3** — core evaluator (pure expressions, no effects yet)
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- **Phase 4** — **effect system** (the headline phase — see discipline section below)
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- **Phase 5** — standard effect library (`console`, `exn`, `state<s>`, `async`)
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- **Phase 6** — classic Koka programs as integration tests (counter, choice, iterator, exception, coroutine)
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Within a phase, pick the checkbox with the best tests-per-effort ratio.
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Every iteration: implement → test → commit → tick `[ ]` in plan → append Progress log → push → next.
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## Substrate-validation discipline (the multi-shot test)
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The reason Koka exists in this set is to verify that SX's `cek-resume` supports **multi-shot continuations**. The Phase 4 commit that lands `choose() -> resume(True) ++ resume(False)` returning `[True, True, False, True]` is the single most important commit in this whole plan. Everything before it is scaffolding; everything after it is filling out the language.
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After every Phase 4 commit, append to the Progress log a line stating which resumption pattern was exercised:
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- **No resume** (handler `return(x) -> e` only) — value pass-through.
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- **Tail resumption** (`op() -> resume(v)`) — handler resumes exactly once, in tail position. Should be optimisable; verify no extra allocation.
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- **Single resume not in tail** (`op() -> let x = resume(v) in compute(x)`) — handler resumes once, then does work after.
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- **Multi-shot** (`choose() -> resume(True) ++ resume(False)`) — handler resumes the same continuation twice.
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- **Zero resume** (handler returns without calling resume) — abort/escape semantics.
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A handler that compiles but does the wrong thing under multi-shot is a substrate bug, not a Koka bug. Open a Blockers entry, do not fix the substrate from this loop.
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## Ground rules (hard)
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- **Scope:** only `lib/koka/**` and `plans/koka-on-sx.md`. Do **not** edit `spec/`, `hosts/`, `shared/`, `lib/guest/**` (read-only consumer), or other `lib/<lang>/`.
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- **Consume `lib/guest/`** wherever it covers a need (lex, pratt, match). Hand-rolling defeats the validation goal.
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- **Do not patch the substrate from this loop.** If `cek-resume` is misbehaving, write the failing test, open a Blockers entry, stop. The fix lives in `spec/evaluator.sx` and is not your scope.
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- **Effect types are deferred entirely.** Track effects at runtime only — an unhandled effect at the top level raises a runtime error, not a type error. No row polymorphism.
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- **NEVER call `sx_build`.** 600s watchdog will kill you. If `sx_server.exe` is broken, add a Blockers entry and stop.
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- **SX files:** `sx-tree` MCP tools ONLY. `sx_validate` after every edit. Never `Edit`/`Read`/`Write` on `.sx`.
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- **Worktree:** commit, then push to `origin/loops/koka`. Never touch `main`. Never push to `architecture`.
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- **Commit granularity:** one feature per commit. Short factual messages: `koka: state effect handler + 4 tests`.
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- **Plan file:** update Progress log + tick boxes every commit.
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- **If blocked** for two iterations on the same issue, add to Blockers and move on.
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## Koka-specific gotchas
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- **Effects are dynamically scoped, not lexically.** When an effect operation `op()` fires inside a function called from inside a handler, the *call-time* handler stack matters, not the *definition-time* environment. This is the opposite of normal lexical scope. SX's `perform`/`cek-resume` is dynamically scoped by construction — that's why the mapping works.
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- **Handler installation is `with handler { body }`, not a function call.** The handler is installed for the dynamic extent of `body`. Implement as a `with-handler` evaluator form, not as a lambda taking a body argument — the body must run *inside* the handler frame, not be passed *into* a handler-creating call.
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- **`resume` is bound by the handler clause, not globally.** Each operation clause `op(args) -> body` exposes `resume` as a callable inside `body`. `resume(v)` continues the suspended computation with `v` as the value of the original `op()` call. Implement by capturing the continuation at the `perform` point and binding it to `resume` in the clause's env.
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- **`return(x) -> e` is the value clause.** When the handled body finishes without firing the effect, its value is bound to `x` in this clause and the result is `e`. If absent, default is `return(x) -> x`. This is *not* the same as a normal function return.
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- **Tail-resumptive handlers should be optimisable.** Most practical handlers (`state.get() -> resume(s)`, `console.println(s) -> { print(s); resume(()) }`) resume exactly once in tail position. The CEK should be able to detect this and skip the continuation capture entirely. If you discover the optimisation is missing, that's substrate work — open a Blockers entry, do not implement here.
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- **`type maybe<a> { Nothing; Just(value: a) }`.** Map directly to SX `(define-type maybe (Nothing) (Just value))`. Polymorphism erased at runtime — the type parameter is for documentation/future inference, not for evaluation.
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- **Pipe `|>` is reverse application.** `x |> f |> g` = `g(f(x))`. Parse as left-associative infix at low precedence.
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- **No type inference, no exhaustiveness checking.** Phase 2 match falls back to runtime `match-failure` exception on no clause hit. Don't try to verify exhaustiveness statically.
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## General gotchas (all loops)
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- SX `do` = R7RS iteration. Use `begin` for multi-expr sequences.
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- `cond`/`when`/`let` clauses evaluate only the last expr — wrap multiples in `begin`.
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- `env-bind!` creates a binding; `env-set!` mutates an existing one (walks scope chain).
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- `sx_validate` after every structural edit.
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- `list?` returns false on raw JS Arrays — host data must be SX-converted.
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- Shell heredoc `||` gets eaten — escape or use `case`.
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## Style
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- No comments in `.sx` unless non-obvious.
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- No new planning docs — update `plans/koka-on-sx.md` inline.
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- Short, factual commit messages (`koka: multi-shot choose + 3 tests`).
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- One feature per iteration. Commit. Log. Push. Next.
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Go. Run the pre-flight check. If lib-guest or the ADT primitive is not in place, stop and report. Otherwise read the plan, find the first unchecked `[ ]`, implement it.
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