50 lines
2.1 KiB
Markdown
50 lines
2.1 KiB
Markdown
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# ACP initialization (initialize, session/new baseline)
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## Metadata
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| Field | Value |
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| Institute | Molodetz Institute — Research & Retrieval Division |
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| Subject | cap-protocol |
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| Document type | Source Dossier |
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| Tier | 1 |
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| Source title | ACP Initialization |
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| Source URL | https://agentclientprotocol.com/protocol/v1/initialization.md |
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| Source type | specification |
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| Source date (published) | Unknown, not stated (living docs) |
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| Date researched | 2026-10-18 |
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| Researched by | tai (agent), model: Muse Spark, on behalf of retoor |
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| Research method | direct page fetch, read in full (initialization handshake, version negotiation, client capabilities) plus session-setup page for session/new |
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| Confidence | High |
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| Status | Active |
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## Summary
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Connection baseline: `initialize` handshake negotiates client/agent capabilities (prompt content types, fs methods, terminals, elicitation modes, notices, compaction), and all agents MUST support `session/new`, `session/prompt`, `session/cancel`, `session/update`.
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## Key findings
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- The four-method MUST baseline is the liveness contract tai's ACP driver can rely on for any agent.
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- Capability negotiation is where tai declines surface (notices, compaction, URL elicitation) and advertises coding-profile grants (fs, terminals); initialize carries `protocolVersion: 1`, `clientCapabilities`, and `clientInfo`.
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- Version negotiation: agent answers with the same version or its latest; tai speaks v1 only and closes on anything else.
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- `session/new` takes `{cwd, mcpServers}` and returns `{sessionId}` (see the session-setup dossier).
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## Pros / strengths
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- Explicit baseline + negotiation keeps a minimal driver compliant by construction.
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## Cons / limitations / caveats
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- v1 only; v2 migration (method renames) deferred until an agent requires it.
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- Auth methods and MCP server passing are out of scope for tai's driver.
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## Relevance to tai
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Handshake design for the ACP driver: capability set tai advertises and the baseline it requires.
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## Changelog
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| Date | Change |
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| 2026-10-18 | Initial dossier created. |
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