refactor(acp): trim unreachable bridge surface (branding knobs, kind-sniffing fallback)
Two pieces of dsh-acp surface were unreachable from any shipped config:
- AcpConfig.agentName/agentVersion: the app package hands the bridge only
{ model, systemPrompt }, so no leaf cordis.yml could set them; they were
settable only by direct-mounting the bridge (a unit test). Hardcode
agentInfo at the initialize site and delete the fields, their schema
defaults, the ?? fallbacks, and the TODO(double-default) whose subject
vanishes. The handshake wire value is unchanged (all snapshot initialize
lines byte-identical).
- The toolKindFor name heuristic special-cased bash*/read*/write/edit*
names in the generic-fallback path, violating the bridge's own design
rule ("the bridge never special-cases tool names"). Every first-party
tool ships its kind via presentCall; the fallback now renders the
neutral kind 'other'. The fallback is reachable when a presentCall
throws OR when model args fail the tool schema (defineTool's presentCall
wrapper returns undefined on violations) — the latter shows up in one
committed golden (hook-codex-posttool-block: three bash calls missing
the required description), whose kind cells flip execute->other. That
3-line golden refresh is the whole transcript delta.
The empty-arguments branch of parseToolArguments lost its only exercise
with the deleted heuristic test; it is live behavior (JSON.parse('')
throws, so the guard is what renders a zero-arg call as rawInput {}), so
it gets a dedicated pin instead of deletion.
RFC moved to docs/rfc/implemented/simplification/ and amended to shipped
reality: fallback reachability includes schema-invalid args, and the
golden churn is exactly the three kind cells (the original zero-churn
claim held only for the branding half).
This commit is contained in:
Tianyi Cui
@@ -62,7 +62,6 @@ Do NOT write one for a mechanical or local choice (a variable name, a one-file r
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| [Remove the `agent/steering` mirror emit](proposed/simplification/2026-07-04-remove-agent-steering-mirror.md) | 2026-07-04 |
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| [Share the app bins' boot glue instead of maintaining twin copies](proposed/simplification/2026-07-04-share-app-bin-boot-glue.md) | 2026-07-04 |
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| [Tighten the hook-protocol contract — dialect, discarded fields, double defaults, and lib-owned `hook/result` semantics](proposed/simplification/2026-07-04-tighten-hook-protocol-contract.md) | 2026-07-04 |
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| [Trim unreachable ACP bridge surface — the branding knobs and the kind-sniffing fallback](proposed/simplification/2026-07-04-trim-acp-bridge-unreachable-surface.md) | 2026-07-04 |
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### Architecture
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@@ -120,6 +119,7 @@ Do NOT write one for a mechanical or local choice (a variable name, a one-file r
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| [Stop mirroring durable boundaries as agent events](implemented/simplification/2026-06-20-remove-agent-boundary-mirror-events.md) | 2026-06-20 |
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| [Split the filesystem seam — provider text mutations plus the `dsh-fs-policy` plugin](implemented/simplification/2026-06-26-fsspec-style-fs-seam.md) | 2026-06-26 |
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| [Stop mirroring the token stream as an agent event](implemented/simplification/2026-07-02-remove-stream-chunk-mirror.md) | 2026-07-02 |
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| [Trim unreachable ACP bridge surface — the branding knobs and the kind-sniffing fallback](implemented/simplification/2026-07-04-trim-acp-bridge-unreachable-surface.md) | 2026-07-04 |
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### Architecture
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@@ -0,0 +1,22 @@
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# RFC: Trim unreachable ACP bridge surface — the branding knobs and the kind-sniffing fallback
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Status: implemented (accepted 2026-07-04)
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## Problem
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Two pieces of `dsh-acp` surface were unreachable from any shipped configuration:
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1. **`AcpConfig.agentName` / `agentVersion`** (`packages/ui/acp/src/index.ts`). The shipped app package hands the bridge only `{ model, systemPrompt }` (`packages/ui/acp-agent/src/index.ts`), so no leaf `cordis.yml` — the only production config surface — could set the knobs at all; they were settable solely by direct-mounting the bridge, which only a unit test did. Every snapshot golden — the hook-matrix scenarios included — pins the schema defaults (`deepseek-harness-acp` / `0.0.1`). The pair also carried a live `TODO(double-default)`: the literals existed twice (schema `.default(...)` plus `??` fallbacks), with the TODO asking to pick one home.
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2. **The `toolKindFor` name heuristic** (same file) special-cased `bash*`/`read*`/`write`/`edit*` tool names in the generic-fallback path. Since the [render-intent union](../architecture/2026-07-02-tool-render-intent-union.md), every first-party tool those arms matched ships its own `presentCall` carrying its kind, and the presenter-less production tools (`subagent`, `subagent_fork`) fell through to `other` anyway. The arms were production-reachable only when a tool declined to present its own call — a `presentCall` that THROWS (the containment fallback), or model arguments that fail the tool's schema so `defineTool`'s `presentCall` wrapper returns `undefined` (e.g. a `bash` call missing the required `description`) — and the bridge's own module doc states the design rule the heuristic violated: "the bridge never special-cases tool names".
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## Decision
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`agentInfo` is hardcoded at the `initialize` site (`{ name: 'deepseek-harness-acp', version: '0.0.1' }`); the two config fields, their schema defaults, the `??` fallbacks, and the `TODO(double-default)` (whose subject vanished with them) are gone, along with the knob half of the direct-mount config test, the two config rows in `packages/ui/acp/README.md`, and the `packages/ui/acp/acp-feature-support.md` cells that described the knobs and the name inference. The emitted handshake wire value is unchanged — zero golden churn on the branding half. `toolKindFor` is replaced by the constant `'other'` at both fallback sites (the presenter fallback and `nullToolPresenter`), and the heuristic is deleted with its test rows. The fixed handshake identity stays pinned by the bridge's initialize unit test and by every snapshot golden. On the fallback half the transcript delta shows up in exactly one committed golden: `hook-codex-posttool-block`, whose recorded model omits the required `description` on three `bash` calls, so those cards take the declined-to-present fallback and carry `kind: 'other'` — the honest neutral card for a call the tool would not vouch for.
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## Why not keep them?
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`agentInfo` is client-visible branding a deployment will eventually want configurable — but a knob no shipped config can reach is not configurability, it is drift surface (the double-default TODO was its symptom), and the honest re-add must include the `dsh-acp-agent` plumb-through that does not exist either; both arrive together with the deployment that needs them. For the heuristic: a hypothetical third-party presenter-less tool named `read_docs` loses an inferred `read` icon — but inferring kinds from unknown plugins' names is exactly the special-casing the render-intent design rejected. The only shipped paths the heuristic reached were the declined-to-present fallbacks (a throwing `presentCall`, or schema-invalid model args); rendering kind `other` there makes the client show the raw input instead of a masquerading first-party card — strictly better diagnostics for a broken presenter or a malformed call.
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## Risks
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None beyond the fallback rendering trade described above — degenerate paths whose neutral card is more diagnosable than an inferred first-party one.
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@@ -1,27 +0,0 @@
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# RFC: Trim unreachable ACP bridge surface — the branding knobs and the kind-sniffing fallback
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Status: proposed
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## Problem
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Two pieces of `dsh-acp` surface are unreachable from any shipped configuration:
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1. **`AcpConfig.agentName` / `agentVersion`** (`packages/ui/acp/src/index.ts`). The shipped app package hands the bridge only `{ model, systemPrompt }` (`packages/ui/acp-agent/src/index.ts`), so no leaf `cordis.yml` — the only production config surface — can set the knobs at all; they are settable solely by direct-mounting the bridge, which only a unit test does. Every snapshot golden — the hook-matrix scenarios included — pins the schema defaults (`deepseek-harness-acp` / `0.0.1`). The pair also carries a live `TODO(double-default)`: the literals exist twice (schema `.default(...)` plus `??` fallbacks), with the TODO asking to pick one home.
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2. **The `toolKindFor` name heuristic** (same file) special-cases `bash*`/`read*`/`write`/`edit*` tool names in the generic-fallback path. Since the [render-intent union](../../implemented/architecture/2026-07-02-tool-render-intent-union.md), every first-party tool those arms match ships its own `presentCall` carrying its kind, and the presenter-less production tools (`subagent`, `subagent_fork`) fall through to `other` anyway. The arms are production-reachable only when a tool's `presentCall` THROWS (the containment fallback) — and the bridge's own module doc states the design rule the heuristic violates: "the bridge never special-cases tool names".
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## Proposal
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Hardcode `agentInfo` at the `initialize` site (`{ name: 'deepseek-harness-acp', version: '0.0.1' }`), deleting the two config fields, their schema defaults, the `??` fallbacks, and the `TODO(double-default)` whose subject vanishes; drop the knob half of the direct-mount config test, the two rows in `packages/ui/acp/README.md`, and the `packages/ui/acp/acp-feature-support.md` cell that cites the knobs. Zero golden churn — the emitted wire value is unchanged. Replace `toolKindFor` with the constant `'other'` in both fallback sites (the presenter fallback and `nullToolPresenter`) and delete the heuristic with its test rows.
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## Why not keep them?
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`agentInfo` is client-visible branding a deployment will eventually want configurable — but a knob no shipped config can reach is not configurability, it is drift surface (the double-default TODO is its symptom), and the honest re-add must include the `dsh-acp-agent` plumb-through that does not exist today either; both arrive together with the deployment that needs them. For the heuristic: a hypothetical third-party presenter-less tool named `read_docs` would lose its inferred `read` icon — but inferring kinds from unknown plugins' names is exactly the special-casing the render-intent design rejected. The behavior delta on shipped paths is confined to the presenter-throw fallback, where rendering kind `other` makes the client show the raw input instead of a masquerading first-party card — strictly better diagnostics for a broken presenter.
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## Acceptance criteria
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- `agentName`/`agentVersion` and `toolKindFor` appear only in this RFC; snapshot goldens are byte-identical; bridge tests are green with the constant fallback.
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- The `initialize` handshake continues to report `deepseek-harness-acp`/`0.0.1` (pinned by the handshake snapshot).
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## Risks
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None beyond the presenter-throw rendering delta described above — an error path whose new behavior is more diagnosable than the old.
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