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`claude-agent-acp` (since v0.6.0 / PR #91) accepts `_meta.systemPrompt: {append: text}` on `session/new` to append to the adapter's native preset while keeping its tool-use prompt intact — the same non-standard extension pattern as `_session/steering` was before it was standardised. ## What changes **Rust (`crates/buzz-acp/`)** - Adds `SystemPromptTransport` enum to `acp.rs`: `Field(&str)` (ACP protocol v2, unchanged) vs `ClaudeMeta(&str)` (new `_meta.systemPrompt: {append: text}`). When both `ClaudeMeta` and `session_title` are present the two `_meta` members are merged into one object so neither clobbers the other. - Gates on exact adapter identity `@agentclientprotocol/claude-agent-acp` in `pool.rs`: `session_new_system_prompt()` routes that name to `ClaudeMeta` regardless of reported `protocolVersion` (CC declares v1). `has_system_prompt_support()` gains the same name check so user-message `[Base]`/`[System]` framing is suppressed for CC sessions. - All other paths — goose post-hoc method, protocol-v2 `Field`, legacy user-message framing — are byte-identical to before. **Desktop (`desktop/src/features/agents/ui/`)** - `agentSessionTranscript.ts`: the `session/new` extractor now checks `params._meta.systemPrompt.append` as a fallback when bare `params.systemPrompt` is absent. Bare field takes precedence. Net line count stays at 1173 (ratchet limit). - `agentSessionTranscript.test.mjs`: two new tests — one verifying the `_meta` transport produces the identical standalone card (same five sections, same `turnId: null`, same placement before the first turn) as the bare-field transport; one proving bare field wins when both transports are present. ## Gate claim `@agentclientprotocol/claude-agent-acp` implies `_meta.systemPrompt` support because the feature landed in v0.6.0 (Oct 2025, commit `ea796f3`) before the `@zed-industries/claude-code-acp` → `@agentclientprotocol/claude-agent-acp` package rename (Mar 2026, commit `b409782`). The new name is therefore a reliable capability gate; the old name falls through to the protocol-version gate (status quo, no regression). ## Tests - Rust: Claude append serialization; `_meta` coexistence with `sessionTitle`; protocol-v2 bare field byte-identical; codex/old-zed omission; claude-name support/suppression gate; old `@zed-industries` name falls through to protocol-version gate. - Desktop: `_meta` transport → identical standalone card; bare field wins over `_meta` when both present. ## Pre-existing failures `just mobile-check` and `just mobile-test` fail identically on clean `origin/main` (5 `compose_bar` / `channels_page` tests + 3 Flutter lint warnings) — not caused by this change. All other `just ci` jobs are green. Signed-off-by: Will Pfleger <pfleger.will@gmail.com> Co-authored-by: npub1mn7jgtj4w2pd0g0zeuhxsa6jy6p0rewxz4kujt98my82ahfmp72sxjexk7 <dcfd242e557282d7a1e2cf2e6877522682f1e5c6156dc92ca7d90eaedd3b0f95@buzz.block.builderlab.xyz>