refactor(core): select system prompts through plugins (#37181)

packages/core/src/plugin/system-prompt.ts

@@ -0,0 +1,47 @@
+export * as SystemPromptPlugin from "./system-prompt"
+
+import { define } from "@opencode-ai/plugin/v2/effect/plugin"
+import { Effect } from "effect"
+
+import PROMPT_ANTHROPIC from "./system-prompt/anthropic.txt"
+import PROMPT_CODEX from "./system-prompt/codex.txt"
+import PROMPT_GEMINI from "./system-prompt/gemini.txt"
+import PROMPT_GPT from "./system-prompt/gpt.txt"
+import PROMPT_KIMI from "./system-prompt/kimi.txt"
+import PROMPT_META from "./system-prompt/meta.txt"
+import PROMPT_TRINITY from "./system-prompt/trinity.txt"
+
+export const OpenAIPlugin = make("openai", (id) => {
+  if (id.includes("gpt")) {
+    if (id.includes("codex")) return PROMPT_CODEX
+    return PROMPT_GPT
+  }
+  if (id.includes("o1") || id.includes("o3")) return PROMPT_GPT
+})
+
+export const GooglePlugin = make("google", (id) => (id.includes("gemini-") ? PROMPT_GEMINI : undefined))
+export const AnthropicPlugin = make("anthropic", (id) => (id.includes("claude") ? PROMPT_ANTHROPIC : undefined))
+export const KimiPlugin = make("kimi", (id) => (id.includes("kimi") ? PROMPT_KIMI : undefined))
+export const ArceePlugin = make("arcee", (id) => (id.includes("trinity") ? PROMPT_TRINITY : undefined))
+export const MetaPlugin = make("meta", (id) => (id.includes("muse-spark") ? PROMPT_META : undefined))
+
+export const Plugins = [OpenAIPlugin, GooglePlugin, AnthropicPlugin, KimiPlugin, ArceePlugin, MetaPlugin] as const
+
+function make(id: string, select: (modelID: string) => string | undefined) {
+  return define({
+    id: `opencode.system-prompt.${id}`,
+    effect: Effect.fn(`SystemPromptPlugin.${id}`)(function* (ctx) {
+      yield* ctx.session.hook("context", (event) =>
+        Effect.gen(function* () {
+          if ((yield* ctx.agent.get(event.agent))?.system) return
+          const system = event.system[0]
+          if (!system) return
+          const model = yield* ctx.catalog.model.get(event.model.providerID, event.model.id)
+          const prompt = select(`${model?.modelID ?? event.model.id} ${model?.family ?? ""}`.toLowerCase())
+          if (!prompt) return
+          event.system[0] = { ...system, text: prompt }
+        }),
+      )
+    }),
+  })
+}