feat(yield): install one package per language

.github/workflows/yield-lab.yml

@@ -30,13 +30,19 @@ jobs:
       - name: Build and smoke-test the packed TypeScript SDK
         working-directory: labs/22-yield/yield/sdk/typescript
         run: |
+          npm test
           npm run build
           tarball="$RUNNER_TEMP/$(npm pack --silent --pack-destination "$RUNNER_TEMP")"
           smoke_dir="$(mktemp -d)"
           cd "$smoke_dir"
           npm init -y >/dev/null
           npm install "$tarball" >/dev/null
           node --input-type=module -e 'import { defineSkill } from "@operatorstack/yield"; if (typeof defineSkill !== "function") process.exit(1)'
+      - name: Verify package launchers and release metadata
+        working-directory: labs/22-yield/yield
+        run: |
+          node --test packaging/*.test.mjs
+          python -m unittest discover -s sdk/python -p 'test_*.py'
       - uses: Swatinem/rust-cache@v2
         with:
           workspaces: |
@@ -99,6 +105,11 @@ jobs:
           npm init -y >/dev/null
           npm install "$tarball" >/dev/null
           node --input-type=module -e 'import { defineSkill } from "@operatorstack/yield"; if (typeof defineSkill !== "function") process.exit(1)'
+      - name: Verify projected package launchers and release metadata
+        working-directory: ${{ runner.temp }}/yield-projected
+        run: |
+          node --test packaging/*.test.mjs
+          python -m unittest discover -s sdk/python -p 'test_*.py'
       - name: Build and test the projected module (incl. 4-language conformance)
         working-directory: ${{ runner.temp }}/yield-projected
         env:

labs/22-yield/distribution/release-notes/2026-08-01-one-package-per-language.md

@@ -0,0 +1,11 @@
+# One package per language
+
+- Install one TypeScript, Python, Go, or Rust package to get both the SDK and
+  the matching `yskill` runtime.
+- Add `yskill --version`, `yskill version`, and language-aware `yskill init`
+  scaffolds pinned to the installed version.
+- Carry immutable Go runtimes for macOS, Linux, and Windows on amd64 and arm64.
+- Fail clearly on unsupported or incomplete installations. The wrappers never
+  download another runtime or search `PATH`.
+- Verify the package launchers, runtime checksums, and shared IR behavior before
+  publishing the public packages.

labs/22-yield/public-readme/README.md

@@ -16,6 +16,31 @@ and moves the part prose loses under context pressure — order, branching,
 retries, approval, state, completion — into a deterministic program. The
 model keeps reasoning, exploration, editing, and judgment.
 
+## Install
+
+Choose one language package. It includes the SDK and the matching `yskill`
+runtime.
+
+```bash
+# TypeScript
+npm install @operatorstack/yield --registry=https://get.operatorstack.systems/npm/
+npm exec -- yskill --version
+
+# Python
+python -m pip install yieldskill --index-url https://get.operatorstack.systems/pip/simple/
+python -m yieldskill --version
+
+# Go
+GOPROXY=https://get.operatorstack.systems/go,direct \
+  go install github.com/operatorstack/yield/cmd/yskill@latest
+yskill --version
+
+# Rust
+cargo install yieldskill \
+  --index sparse+https://get.operatorstack.systems/cargo/index/ --locked
+yskill --version
+```
+
 ## How it works
 
 Deterministic re-execution: on every run/resume, `yskill` re-executes the
@@ -25,7 +50,7 @@ and the process exits — no daemon. A replayed step that produces a
 different operation than the journal recorded is a divergence and fails
 the run loudly; it never silently forks.
 
-- **`yskill` (supervisor)** owns the append-only run log
+- **`yskill`** owns the append-only run log
   (`.yield/runs/<id>.jsonl`), sequence and digest binding, response
   validation, and every refusal (stale, duplicate, wrong-run,
   schema-invalid, digest-mismatch, completion-unproven).
@@ -45,7 +70,7 @@ Five primitives, two exits:
 ## Four languages, one protocol
 
 Write the skill program in Go, TypeScript, Python, or Rust — the
-supervisor doesn't care. Every SDK implements the same certified
+runtime doesn't care. Every SDK implements the same certified
 execution contract over the canonical `ir/yield.v1` schemas, and the
 conformance suite (`internal/conformance`) runs the *same program* in all
 four languages and asserts identical observable protocol behavior.

labs/22-yield/yield/cmd/yskill/main.go

@@ -9,6 +9,8 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"runtime"
+	"runtime/debug"
 	"strings"
 
 	"github.com/operatorstack/yield/internal/engine"
@@ -19,14 +21,30 @@ const usage = `yskill — turn SKILL.md workflows into resumable programs
 
 Usage:
   yskill init <dir>                          scaffold a skill (or wrap an existing prose skill)
+         [--language typescript|python|go|rust]
   yskill run <skill-dir> [--input file]      start a run; prints the first operation envelope
   yskill resume <run-id> --response file     feed a response; prints the next operation
          [--skill dir] [--accept-new-digest]
   yskill inspect <run-id> [--skill dir]      print the run's event log
   yskill replay <run-id> [--skill dir]       re-derive the run from its log; verify determinism
   yskill test <skill-dir>                    run the skill against fixtures/responses.json
+  yskill version                             print the runtime version and target
 `
 
+// version is set from the release tag with -ldflags "-X main.version=<version>".
+var version = "dev"
+var readBuildInfo = debug.ReadBuildInfo
+
+func runtimeVersion() string {
+	if version != "" && version != "dev" {
+		return strings.TrimPrefix(version, "v")
+	}
+	if info, ok := readBuildInfo(); ok && info.Main.Version != "" && info.Main.Version != "(devel)" {
+		return strings.TrimPrefix(info.Main.Version, "v")
+	}
+	return "dev"
+}
+
 func main() {
 	if len(os.Args) < 2 {
 		fmt.Fprint(os.Stderr, usage)
@@ -46,6 +64,8 @@ func main() {
 		err = cmdReplay(os.Args[2:])
 	case "test":
 		err = cmdTest(os.Args[2:])
+	case "version", "--version":
+		fmt.Printf("yskill %s %s/%s\n", runtimeVersion(), runtime.GOOS, runtime.GOARCH)
 	case "help", "-h", "--help":
 		fmt.Print(usage)
 	default:
@@ -258,84 +278,12 @@ func compact(raw json.RawMessage) string {
 func cmdInit(args []string) error {
 	fs := flag.NewFlagSet("init", flag.ExitOnError)
 	sdkPath := fs.String("sdk", "", "filesystem path to the yield module (written as a go.mod replace directive)")
-	if err := fs.Parse(args); err != nil {
+	language := fs.String("language", defaultLanguage(), "workflow language: typescript, python, go, or rust")
+	if err := parseOnePositional(fs, args); err != nil {
 		return err
 	}
 	if fs.NArg() != 1 {
 		return fmt.Errorf("init takes exactly one directory")
 	}
-	dir := fs.Arg(0)
-	name := filepath.Base(dir)
-	if err := os.MkdirAll(filepath.Join(dir, "fixtures"), 0o755); err != nil {
-		return err
-	}
-	writeIfAbsent := func(rel, content string) error {
-		path := filepath.Join(dir, rel)
-		if _, err := os.Stat(path); err == nil {
-			fmt.Printf("init: %s exists, preserved\n", rel)
-			return nil
-		}
-		return os.WriteFile(path, []byte(content), 0o644)
-	}
-	if err := writeIfAbsent("SKILL.md", fmt.Sprintf(skillMD, name)); err != nil {
-		return err
-	}
-	if err := writeIfAbsent("main.go", mainGo); err != nil {
-		return err
-	}
-	if err := writeIfAbsent("fixtures/responses.json", "{\n  \"confirm-start\": {\"value\": \"yes\"}\n}\n"); err != nil {
-		return err
-	}
-	gomod := fmt.Sprintf("module %s\n\ngo 1.26.5\n\nrequire github.com/operatorstack/yield v0.0.0\n", name)
-	if *sdkPath != "" {
-		gomod += fmt.Sprintf("\nreplace github.com/operatorstack/yield => %s\n", *sdkPath)
-	} else {
-		gomod += "\n// Point this at your yield checkout:\n// replace github.com/operatorstack/yield => ../path/to/yield\n"
-	}
-	if err := writeIfAbsent("go.mod", gomod); err != nil {
-		return err
-	}
-	fmt.Printf("init: skill %q scaffolded in %s\n", name, dir)
-	return nil
+	return scaffoldSkill(fs.Arg(0), *language, *sdkPath)
 }
-
-const skillMD = `---
-name: %s
-description: TODO — one line on what this skill does.
----
-
-Run:
-
-    yskill run .
-
-Follow each returned operation exactly.
-
-- ` + "`ask_user`" + `: ask the user using the host's normal interface.
-- ` + "`agent_task`" + `: perform the task and return schema-valid JSON.
-- ` + "`run_command`" + `: yskill executes it itself; you will not see this kind.
-
-Resume the run after each operation:
-
-    yskill resume <run-id> --response response.json
-
-Do not skip an operation or invent its response.
-`
-
-const mainGo = `package main
-
-import (
-	"github.com/operatorstack/yield/sdk/yield"
-)
-
-func main() {
-	yield.Main(func(ctx *yield.Context) (yield.Outcome, error) {
-		answer := ctx.AskUser("confirm-start", "Ready to start?")
-		if answer != "yes" {
-			return yield.Outcome{}, ctx.Refused("user declined to start")
-		}
-		tests := ctx.RunCommand("run-tests", "true", 60)
-		ctx.Require(tests.ExitCode == 0, "the test command passes", tests)
-		return ctx.Complete(map[string]string{"status": "ok"})
-	})
-}
-`

labs/22-yield/yield/cmd/yskill/main_test.go

@@ -2,9 +2,29 @@ package main
 
 import (
 	"flag"
+	"os"
+	"path/filepath"
+	"runtime/debug"
+	"strings"
 	"testing"
 )
 
+func TestRuntimeVersionUsesGoModuleVersion(t *testing.T) {
+	previousVersion := version
+	previousReadBuildInfo := readBuildInfo
+	version = "dev"
+	readBuildInfo = func() (*debug.BuildInfo, bool) {
+		return &debug.BuildInfo{Main: debug.Module{Version: "v1.2.3"}}, true
+	}
+	t.Cleanup(func() {
+		version = previousVersion
+		readBuildInfo = previousReadBuildInfo
+	})
+	if got := runtimeVersion(); got != "1.2.3" {
+		t.Fatalf("runtimeVersion = %q, want 1.2.3", got)
+	}
+}
+
 func TestParseOnePositionalAllowsDocumentedFlagOrder(t *testing.T) {
 	fs := flag.NewFlagSet("resume", flag.ContinueOnError)
 	response := fs.String("response", "", "response file")
@@ -30,3 +50,101 @@ func TestParseOnePositionalKeepsFlagFirstOrder(t *testing.T) {
 		t.Fatalf("args = %q response = %q", fs.Args(), *response)
 	}
 }
+
+func TestScaffoldSkillWritesLanguageSpecificEntrypoints(t *testing.T) {
+	previousVersion := version
+	version = "0.1.9"
+	t.Cleanup(func() { version = previousVersion })
+
+	tests := []struct {
+		language string
+		files    []string
+		command  string
+		pin      string
+	}{
+		{"typescript", []string{"main.ts", "package.json", "skill.json"}, "npm exec -- yskill run .", `"@operatorstack/yield": "0.1.9"`},
+		{"python", []string{"main.py", "requirements.txt", "skill.json"}, "python -m yieldskill run .", "yieldskill==0.1.9"},
+		{"go", []string{"main.go", "go.mod"}, "yskill run .", "github.com/operatorstack/yield v0.1.9"},
+		{"rust", []string{"src/main.rs", "Cargo.toml", ".cargo/config.toml", "skill.json"}, "yskill run .", `version = "=0.1.9"`},
+	}
+	for _, tt := range tests {
+		t.Run(tt.language, func(t *testing.T) {
+			dir := filepath.Join(t.TempDir(), "My Skill")
+			if err := scaffoldSkill(dir, tt.language, ""); err != nil {
+				t.Fatal(err)
+			}
+			for _, rel := range append(tt.files, "SKILL.md", "fixtures/responses.json") {
+				if _, err := os.Stat(filepath.Join(dir, filepath.FromSlash(rel))); err != nil {
+					t.Fatalf("%s: %v", rel, err)
+				}
+			}
+			skill := readTestFile(t, filepath.Join(dir, "SKILL.md"))
+			if !strings.Contains(skill, tt.command) {
+				t.Fatalf("SKILL.md does not contain %q:\n%s", tt.command, skill)
+			}
+			var manifest string
+			switch tt.language {
+			case "typescript":
+				manifest = readTestFile(t, filepath.Join(dir, "package.json"))
+			case "python":
+				manifest = readTestFile(t, filepath.Join(dir, "requirements.txt"))
+			case "go":
+				manifest = readTestFile(t, filepath.Join(dir, "go.mod"))
+			case "rust":
+				manifest = readTestFile(t, filepath.Join(dir, "Cargo.toml"))
+			}
+			if !strings.Contains(manifest, tt.pin) {
+				t.Fatalf("manifest does not contain %q:\n%s", tt.pin, manifest)
+			}
+		})
+	}
+}
+
+func TestPythonScaffoldUsesInvokingInterpreter(t *testing.T) {
+	previousVersion := version
+	version = "0.1.9"
+	t.Cleanup(func() { version = previousVersion })
+	t.Setenv("YIELD_PYTHON", "/opt/yield/.venv/bin/python")
+	dir := filepath.Join(t.TempDir(), "python-skill")
+	if err := scaffoldSkill(dir, "python", ""); err != nil {
+		t.Fatal(err)
+	}
+	skill := readTestFile(t, filepath.Join(dir, "skill.json"))
+	if !strings.Contains(skill, `"/opt/yield/.venv/bin/python"`) {
+		t.Fatalf("skill.json does not use the invoking interpreter: %s", skill)
+	}
+}
+
+func TestScaffoldSkillPreservesExistingSkillAndRejectsUnknownLanguage(t *testing.T) {
+	dir := t.TempDir()
+	if err := os.WriteFile(filepath.Join(dir, "SKILL.md"), []byte("keep me\n"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	if err := scaffoldSkill(dir, "typescript", ""); err != nil {
+		t.Fatal(err)
+	}
+	if got := readTestFile(t, filepath.Join(dir, "SKILL.md")); got != "keep me\n" {
+		t.Fatalf("existing SKILL.md changed: %q", got)
+	}
+	if err := scaffoldSkill(t.TempDir(), "java", ""); err == nil || !strings.Contains(err.Error(), "unsupported language") {
+		t.Fatalf("unknown language error = %v", err)
+	}
+}
+
+func TestPackageVersionFallsBackForDevelopmentBuilds(t *testing.T) {
+	previousVersion := version
+	version = "dev"
+	t.Cleanup(func() { version = previousVersion })
+	if got := packageVersion(); got != "0.0.0" {
+		t.Fatalf("packageVersion = %q", got)
+	}
+}
+
+func readTestFile(t *testing.T, path string) string {
+	t.Helper()
+	b, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return string(b)
+}