docs(agent-notes): replace product provider proposal
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pku-xht
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# side as of the last confirmed-consistent state. Both languages carry equal authority;
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# after editing either side, bring the other along and re-record with:
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# pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-06-21-subagent-capability-seam.md
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2026-06-21-subagent-capability-seam.md: 043092884731c403a11b71ef8b5a410e9e5af7e0
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2026-06-21-subagent-capability-seam.zh.md: 6a4a5798199ca7d6d7c011668a319d65a0553208
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2026-06-21-subagent-capability-seam.md: fd22b883572e5304c1587c818026c36235ef504d
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2026-06-21-subagent-capability-seam.zh.md: fcfdf3e9c1eb35d7c372aa4311ebf8da192b56a7
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@@ -14,7 +14,8 @@ The distinctive requirement — the one that shapes the whole design — is that
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- **in-process** — a child concrete `Agent` on the same `Context` (the cheapest, and nearly free given the existing agent factory);
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- **ACP** — act as an ACP *client* driving another agent process (which can be another instance of ourselves);
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- later: **A2A**, the **Codex app-server**, and the **Claude Code Agent SDK** — each the same out-of-process "start a child, prompt it, stream updates, cancel" shape as the ACP backend.
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- **Codex app-server** — a current one-shot sibling that applies the same named-provider seam to the official product process ([product-provider Agent Note](../../proposed/feature/2026-08-04-claude-code-and-codex-subagent-backends.md));
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- later: **A2A** and the **Claude Code Agent SDK** — the same out-of-process "start a child, prompt it, settle, cancel" shape; the Claude sibling remains in the product-provider proposal.
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## Alternatives considered
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@@ -14,7 +14,8 @@ harness 有一个长期搁置的 seam 用于 **subagent**：一个 agent（智
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- **进程内**：在同一个 `Context` 上创建一个具体的子 `Agent`（最廉价，且鉴于现有 agent 工厂几乎零成本）；
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- **ACP**：作为 ACP *客户端*驱动另一个 agent 进程（可以是自身的另一个实例）；
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- 后续：**A2A**、**Codex app-server** 与 **Claude Code Agent SDK**——每种都与 ACP 后端相同的进程外形状：「启动子 agent、发送提示词、流式接收更新、取消」。
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- **Codex app-server**：当前的一次性兄弟提供方，将同一个命名提供方 seam 应用于官方产品进程（[产品提供方 Agent Note](../../proposed/feature/2026-08-04-claude-code-and-codex-subagent-backends.md)）；
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- 后续：**A2A** 与 **Claude Code Agent SDK**——两者采用同样的进程外形态：「启动子 agent、发送提示词、结算、取消」；Claude 兄弟提供方仍在产品提供方提案中。
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## 曾考虑的替代方案
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@@ -2,5 +2,5 @@
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# side as of the last confirmed-consistent state. Both languages carry equal authority;
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# after editing either side, bring the other along and re-record with:
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# pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-06-22-acp-subagent-backend.md
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2026-06-22-acp-subagent-backend.md: 5f12aa1c08d4f4cfaa35f2f7f4b09ad341c3eae8
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2026-06-22-acp-subagent-backend.zh.md: 61359246b0c552f6126cd82ae843d489de809a38
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2026-06-22-acp-subagent-backend.md: ea0ec821b1f7a55d173f58c5bc4ba8829ef65c54
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2026-06-22-acp-subagent-backend.zh.md: 32e83a7a4e89eb7adb17220dc66952bca0a165aa
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@@ -59,4 +59,4 @@ Every run pays a fresh subprocess (spawn + `initialize` + `newSession`). The par
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## Future providers
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The same out-of-process spawn/prompt/stream/cancel shape generalizes to other transports named in the seam Agent Note — A2A, the Codex app-server, and the Claude Code Agent SDK — each a sibling provider registered by name. The ACP backend is the proof that the seam supports the boundary; those are mechanically similar.
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The [Codex app-server provider](../../proposed/feature/2026-08-04-claude-code-and-codex-subagent-backends.md) now applies the same out-of-process spawn/prompt/settle/cancel boundary as a sibling registered by name. A2A and the Claude Code Agent SDK remain future sibling transports; the ACP backend proves that the common seam supports the boundary without owning their private protocols.
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@@ -59,4 +59,4 @@ ACP `StopReason` → harness `SubagentStopReason`：`end_turn`→`completed`、`
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## 后续提供方
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同样的进程外启动/提示词/流式输出/取消形态可泛化到 seam Agent Note 中列出的其他传输方式——A2A、Codex app-server 和 Claude Code Agent SDK——每个都是按名称注册的兄弟提供方。ACP 后端证明了 seam 支持跨进程边界；其余在机制上类似。
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[Codex app-server 提供方](../../proposed/feature/2026-08-04-claude-code-and-codex-subagent-backends.md)已将同样的进程外启动/提示词/结算/取消边界应用于按名称注册的兄弟提供方。A2A 与 Claude Code Agent SDK 仍是未来的兄弟传输方式；ACP 后端证明了通用 seam 能够支持该边界，而无需负责它们的私有协议。
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