摘要
Gemini CLI v0.57.0 stable（2026-08-25T18:37Z）的发布 tag 中包含 packages/a2a-server（Agent2Agent 协议 server），且该包已以 @google/gemini-cli-a2a-server@0.57.0 发布到 npm。Release notes 合并了一大批「[SSR Agent]」修复，涉及 a2a-server 测试、TUI 执行超时、subagent 开关与交接回归，说明这是持续维护的功能而非废弃实验。Gemini CLI 0.60.0 随后把 MCP OAuth、路径边界、环境变更确认、工具输出来源和沙箱隔离修复推入 stable。Google 仍未给出 A2A server 的官方公告、文档页面或使用指引。
为什么重要
Agent 间互操作从 main 分支实验（8/19 观察到）变成了 Google 稳定运行时里可安装的产物——继 Anthropic 之后第二家在稳定工具链中暴露 agent 间消息能力的大型组织。但它既无文档也无公告，应视为 Google 路线图的方向信号、而不是可以构建依赖的目标：接口随时可能变化。
技术细节
| 发布 | v0.57.0 stable 于 2026-08-25T18:37:14Z 发布；v0.57.0 tag 树中包含 packages/a2a-server（经 git tree API 核实） |
|---|---|
| Npm | @google/gemini-cli-a2a-server@0.57.0 已发布；包在 @google scope 下 |
| Release Notes | v0.57.0 合并多批「[SSR Agent]」修复：a2a-server 测试迁移、TUI 执行超时、agents 模式关闭时的 subagent 拦截、sub-agent 交接 token 回归、cli_help markdown 格式化 |
| 包内容 | a2a-server/src 含 agent executor/task 模块、命令注册表、extensions；附 development-extension-rfc.md |
| 状态 | 已发布但未文档化：截至 2026-08-28 无官方公告、文档或使用遥测 |
| 关联 | 8/19 early indication（a2a-server 仅 main 分支）升级为 stable 产物；作为趋势 coding-agents-multi-agent-runtimes 的证据 |
后续更新
2026-09-02 0.58.0 stable (9/1T20:51Z): macOS Seatbelt sandbox now isolates Docker and container-runtime sockets and binaries (sandbox hardening); a2a-server fix — stale cancellation error cleared on new message turns (a2a-server continues in the stable release line); consistent symlink evaluation in ignore-path handling; top-level safety checkers declared in write-policy configuration; history rollback and retry-nudge fixes. a2a-server documentation still absent (watch item). 0.59.0-preview.0 published 9/1T20:19Z
2026-09-04 No new stable in window (latest remains 0.58.0, 9/1). Nightlies: 0.59.0-nightly (9/2): web-fetch destination validation + connection routing fix; 0.60.0-nightly (9/4) security cluster — RFC 9207 issuer identification enforced in the MCP OAuth flow, macOS Seatbelt temp-dir isolation, extension-loader path-boundary hardening, hardcoded Google CrUX API key removed from chrome-devtools-mcp. a2a-server docs watch: packages/a2a-server now carries a README.md, but it is a 171-byte 'experimental and under active development' stub — still no usage/setup documentation. Stays TRIAL
标签
gemini-cligooglea2aagent-to-agentprotocolmulti-agentcli