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feat(core): restore per-request system prompt (#34335)

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Kit Langton 2026-06-28 14:02:46 -04:00 • committed by GitHub
commit 04c6bed240
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9 changed files with 103 additions and 2 deletions
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53
packages/core/test/session-runner.test.ts
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@ -847,6 +847,59 @@ describe("SessionRunnerLLM", () => {
}),
)
it.effect("appends the per-request prompt system after the agent prompt and durable baseline", () =>
Effect.gen(function* () {
yield* setup
const agent = yield* AgentV2.Service
yield* agent.transform((editor) =>
editor.update(AgentV2.ID.make("build"), (agent) => {
agent.system = "Build agent instructions"
agent.mode = "primary"
}),
)
const session = yield* SessionV2.Service
yield* session.prompt({
sessionID,
prompt: Prompt.make({ text: "First", system: "Per-request override" }),
resume: false,
})
requests.length = 0
response = fragmentFixture("text", "text-system", ["Done"]).completeEvents
yield* session.resume(sessionID)
expect(requests.at(-1)?.system.map((part) => part.text)).toEqual([
"Build agent instructions",
"Initial context",
"Per-request override",
])
}),
)
it.effect("omits the per-request system part when the prompt has no system string", () =>
Effect.gen(function* () {
yield* setup
const agent = yield* AgentV2.Service
yield* agent.transform((editor) =>
editor.update(AgentV2.ID.make("build"), (agent) => {
agent.system = "Build agent instructions"
agent.mode = "primary"
}),
)
const session = yield* SessionV2.Service
yield* session.prompt({ sessionID, prompt: Prompt.make({ text: "First" }), resume: false })
requests.length = 0
response = fragmentFixture("text", "text-no-system", ["Done"]).completeEvents
yield* session.resume(sessionID)
expect(requests.at(-1)?.system.map((part) => part.text)).toEqual([
"Build agent instructions",
"Initial context",
])
}),
)
it.effect("uses an explicitly selected non-build agent system", () =>
Effect.gen(function* () {
yield* setup