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feat(agent-loop): open every prompt with the harness identity section

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A static harness:identity section at order -100 — the first occupant of
the documented negative band — states that the agent is powered by the
DeepSeek Harness SDK before the deployment's persona renders. Harness
attribution is a harness fact: it lives on the loop plugin, not in each
deployment's persona, so every agent (subagents included) carries it and
no YAML can forget it. A deployment that must drop it can remove the
section in the system-prompt/assemble waterfall.

Order-band docs updated in all five homes (PromptSection JSDoc, the
system-prompt and agent-loop READMEs, architecture.md, the RFC).
This commit is contained in:
Tianyi Cui
2026-07-05 11:37:32 +08:00
parent 2f191cc72b
commit 00cf8b693a
7 changed files with 31 additions and 22 deletions
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16
packages/core/agent-loop/tests/loop.spec.ts
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@@ -141,7 +141,7 @@ describe('agent loop', () => {
.toEqual({ diffs: [{ path: 'a.txt', oldText: null, newText: 'x' }] })
})
it('renders the persona as the order-0 section — before tool guidance — with {{variables}} resolved', async () => {
it('renders harness identity, then the persona, then tool guidance — with {{variables}} resolved', async () => {
const adapter = new MockAdapter([textResponse('ok')])
const ctx = await harness(adapter)
ctx.systemPrompt.section({ name: 'tool:noop', order: 100, text: 'Use the noop tool wisely.' })
@@ -161,7 +161,7 @@ describe('agent loop', () => {
await waitForIdle(ctx, agent)
const request = adapter.requests[0]
expect(request!.system).toBe('You are a test agent on mock.\n\nUse the noop tool wisely.')
expect(request!.system).toBe('You are an AI agent powered by the DeepSeek Harness SDK.\n\nYou are a test agent on mock.\n\nUse the noop tool wisely.')
expect(request!.tools?.map(t => t.name)).toEqual(['noop'])
})
@@ -179,7 +179,7 @@ describe('agent loop', () => {
send(agent, 'hi')
await waitForIdle(ctx, agent)
expect(adapter.requests[0]!.system).toBe('Working in /work/space.')
expect(adapter.requests[0]!.system).toBe('You are an AI agent powered by the DeepSeek Harness SDK.\n\nWorking in /work/space.')
})
it('contains a strict-variable render failure: the turn errors, the loop keeps serving turns', async () => {
@@ -212,7 +212,7 @@ describe('agent loop', () => {
await waitForIdle(ctx, agent)
expect(adapter.requests).toHaveLength(1)
expect(adapter.requests[0]!.system).toBe('In /rescued.')
expect(adapter.requests[0]!.system).toBe('You are an AI agent powered by the DeepSeek Harness SDK.\n\nIn /rescued.')
const turnEnds = agent.session.events.filter(e => e.type === 'turn/end')
expect(turnEnds).toHaveLength(2)
expect(turnEnds[1]?.type === 'turn/end' && turnEnds[1].data.reason.kind).toBe('completed')
@@ -426,10 +426,12 @@ describe('agent loop', () => {
send(agent, 'go')
await waitForIdle(ctx, agent)
// One fire per step, in order, each with the assembled system prompt.
// One fire per step, in order, each with the assembled system prompt
// (here just the loop's own harness-identity section — no persona set).
const HARNESS = 'You are an AI agent powered by the DeepSeek Harness SDK.'
expect(fires).toEqual([
{ turn: 1, step: 1, fullSystemPrompt: '' },
{ turn: 1, step: 2, fullSystemPrompt: '' },
{ turn: 1, step: 1, fullSystemPrompt: HARNESS },
{ turn: 1, step: 2, fullSystemPrompt: HARNESS },
])
})