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feat(core): inject plan mode reminders on agent switch

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Subscribe to session.agent.selected and admit a synthetic system reminder
when entering or leaving Plan, without waking the session.
This commit is contained in:
Aiden Cline
2026-08-11 01:03:17 -05:00
parent e0a9d43f8c
commit 0652e32ae1
1 changed files with 30 additions and 3 deletions
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packages/core/src/plugin/plan.ts
+30 -3
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@@ -2,14 +2,24 @@ export * as PlanPlugin from "./plan"
import { ToolFailure } from "@opencode-ai/ai"
import { define } from "@opencode-ai/plugin/effect/plugin"
import { Effect } from "effect"
import { Effect, Stream } from "effect"
import { Agent } from "../agent"
const plan = Agent.ID.make("plan")
const enter = `<system-reminder>
You are in Plan mode. This is a read-only mode. Do not modify files or take other write actions. Do not delegate work to a subagent that can make edits. Investigate, ask questions, and propose a plan.
</system-reminder>`
const leave = `<system-reminder>
You are no longer in Plan mode. The previous read-only restrictions no longer apply. You may edit files and use write tools again.
</system-reminder>`
export const Plugin = define({
id: "opencode.plan",
effect: Effect.fn(function* (ctx) {
yield* ctx.agent.transform((draft) => {
draft.update(Agent.ID.make("plan"), (item) => {
draft.update(plan, (item) => {
item.name = Agent.Name.make("Plan")
item.description = "Read-only agent for exploring the codebase and planning work before implementation."
item.mode = "primary"
@@ -18,11 +28,28 @@ export const Plugin = define({
})
yield* ctx.tool.hook("execute.before", (event) => {
if (event.agent !== Agent.ID.make("plan")) return Effect.void
if (event.agent !== plan) return Effect.void
if (event.tool !== "edit" && event.tool !== "write" && event.tool !== "patch") return Effect.void
return new ToolFailure({
message: `Cannot use ${event.tool} in Plan mode. You are in a read-only mode and must not modify files.`,
})
})
yield* ctx.event.subscribe().pipe(
Stream.filter((event) => event.type === "session.agent.selected"),
Stream.runForEach((event) => {
if (event.data.agent === event.data.previous) return Effect.void
const text = event.data.agent === plan ? enter : event.data.previous === plan ? leave : undefined
if (!text) return Effect.void
return ctx.session
.synthetic({
sessionID: event.data.sessionID,
text,
resume: false,
})
.pipe(Effect.catch(() => Effect.void))
}),
Effect.forkScoped({ startImmediately: true }),
)
}),
})