fix(invariants): assert runtime relationships, not API shapes

packages/bash/bash/src/invariant.ts

@@ -1,24 +1,30 @@
-/** Package-owned runtime contract checks for `@deepseek-ai/dsh-bash`. @module @deepseek-ai/dsh-bash/invariant */
+/** Package-owned session-event invariants for the bash seam. @module @deepseek-ai/dsh-bash/invariant */
 
 import type { Context } from 'cordis'
-import { observeServiceInvariant, serviceShapeViolation, type InvariantInstaller } from '@deepseek-ai/dsh-invariants'
+import type { Session, SessionEvent } from '@deepseek-ai/dsh-session'
+import type { InvariantInstaller } from '@deepseek-ai/dsh-invariants'
+import { SANDBOX_MODES } from './session-mode.ts'
 
 const PACKAGE_NAME = '@deepseek-ai/dsh-bash'
 
 /** Cordis companion plugin name. */
 export const name = 'bash-invariant'
-/** Services required before the companion can register. */
+/** Service required before the companion can reserve package ownership. */
 export const inject = ['invariants']
 
-/** Validate every implementation bound to this package's service seam. */
+/** Install validation for the durable sandbox-mode vocabulary. */
 const install: InvariantInstaller = (ctx, fail) => {
-  observeServiceInvariant(ctx, fail, 'bash', value => serviceShapeViolation(value, {
-    methods: ['resolve', 'run', 'start'],
-  }))
+  ctx.on('internal/dispatch', (_mode, eventName, args) => {
+    if (eventName !== 'session/event') return
+    const event = (args as [Session, SessionEvent])[1]
+    if (event.type === 'bash/sandbox-mode' && !SANDBOX_MODES.includes(event.data.mode)) {
+      fail(`bash/sandbox-mode carries unknown mode ${JSON.stringify(event.data.mode)}`)
+    }
+  }, { global: true })
 }
 
 /**
- * Register this package's invariant companion.
+ * Register the bash invariant companion.
  * @param ctx - Cordis context carrying the invariant service.
  * @returns the installed registration's disposer after setup succeeds.
  */

packages/bash/bash/tests/invariant.spec.ts

@@ -0,0 +1,33 @@
+import { describe, expect, it } from 'vitest'
+import { Context } from 'cordis'
+import type { Session, SessionEvent } from '@deepseek-ai/dsh-session'
+import InvariantService from '@deepseek-ai/dsh-invariants'
+import * as BashInvariant from '@deepseek-ai/dsh-bash/invariant'
+
+async function setup(): Promise<Context> {
+  const ctx = new Context()
+  await ctx.plugin(InvariantService)
+  await ctx.plugin(BashInvariant)
+  return ctx
+}
+
+function modeEvent(mode: string): SessionEvent {
+  return { type: 'bash/sandbox-mode', seq: 0, time: 0, data: { mode } } as SessionEvent
+}
+
+describe('bash invariants', () => {
+  it('accepts the closed sandbox vocabulary and ignores unrelated events', async () => {
+    const ctx = await setup()
+    expect(() => { ctx.emit('session/event', {} as Session, modeEvent('workspace-write')) }).not.toThrow()
+    expect(() => { ctx.emit('session/event', {} as Session, {
+      type: 'turn/start', seq: 0, time: 0, data: {},
+    } as SessionEvent) }).not.toThrow()
+    expect(() => { ctx.emit('tools/change') }).not.toThrow()
+  })
+
+  it('rejects an unknown durable sandbox mode', async () => {
+    const ctx = await setup()
+    expect(() => { ctx.emit('session/event', {} as Session, modeEvent('host-root')) })
+      .toThrow(/unknown mode "host-root"/)
+  })
+})