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fix(agent-presets): re-link recompose through the mount-time binding

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The auto-merge kept recompose on the removed open re-link. It now moves
the binding this roster kept from the agent's mount; an agent that never
composed one has nothing to re-link, so the switch is its first bind —
exactly a mount — and once bound only the kept binding can move it.
This commit is contained in:
Yichen Jiang
2026-08-10 11:20:55 +08:00
parent 39982843f6
commit bdcf940eea
2 changed files with 21 additions and 3 deletions
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12
packages/preset/agent-presets/src/index.ts
View File

@@ -225,7 +225,10 @@ export class AgentPresets extends Service {
* and permanent, so the old composition stays for its other agents and the
* new one is ensured BEFORE the link moves. An unknown or unusable preset
* therefore throws with the agent exactly as it was — there is no torn-down
* state to restore.
* state to restore. The re-link runs through the binding this roster kept
* from the agent's mount — dsh-scope's only re-link authority. An agent
* that never composed one has nothing to re-link: the switch is then the
* agent's first bind, exactly a mount.
* @param agentCtx - the agent's scope context.
* @param id - the preset to compose the agent from instead.
* @returns the preset now installed.
@@ -238,7 +241,12 @@ export class AgentPresets extends Service {
}
const preset = await this.resolve(id)
const standing = await this.ensureStanding(preset)
setScopeParent(agentKey, standing.key)
const binding = this.bindings.get(agentKey)
if (binding === undefined) {
this.bindings.set(agentKey, bindScopeParent(agentKey, standing.key))
} else {
binding.rebind(standing.key)
}
return preset
}

12
packages/preset/agent-presets/tests/mount.spec.ts
View File

@@ -368,9 +368,19 @@ describe('replacing a composition', () => {
expect(toolNames(ctx, handle.agent)).toEqual(['alpha'])
})
it('leaves an agent that never composed one with nothing to restore', async () => {
it('binds an agent that never composed one as its first mount', async () => {
// No binding exists to re-link, so the switch is the agent's first bind
// — and once bound, only this roster's kept binding can move it again.
const handle = await ctx.agents.create({ sessionId: SessionId('sess-bare') })
await ctx.agentPresets.recompose(handle.agent.ctx, 'standard')
expect(toolNames(ctx, handle.agent)).toEqual(['alpha'])
})
it('leaves an agent that never composed one with nothing to restore', async () => {
const handle = await ctx.agents.create({ sessionId: SessionId('sess-bare-broken') })
await expect(ctx.agentPresets.recompose(handle.agent.ctx, 'broken'))
.rejects.toThrow(/failed to mount/)