feat(skills): concise mode — toggleable output-shaping skill

packages/app-bundle/manifest.json

@@ -28,7 +28,7 @@
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     "packages/app/src/desktop-menu.ts": "350e0e9f2e4294bfe1b1f357b3cd2ea0908b14d20ca1e79fda2305db1958fb24",
     "packages/app/src/entry.tsx": "f35e1017f4c9d478d254b2a38043e5750064b6bef25169c3e07ae9f72ff1049c",
-    "packages/app/src/index.css": "2c11df3dcebb381358e06626094b5dda3c35688ad7940d643b2cbb6cff1ea9e9",
+    "packages/app/src/index.css": "727656c5e7ff7d7c7ff4fc95a3ec7c9148a34f1f974a58a297285e870519be5d",
     "packages/app/src/theme-preload.test.ts": "d9e4e96dd39a3491493637682611bedf6ddf4b6e4dbdddcb60bf006211b137a1",
     "packages/app/test-browser/empty-workspace-landing.test.ts": "83d19ecf5da37c234dbde1a004432865204d7f412a335c4e470a07e73d9bcda4",
     "packages/app/test-browser/keybind-migration.test.ts": "192418880d432ff62d15fd80f6250ece6233e43d0dbe11d5a4fbb5f4d9e45a06",
@@ -98,6 +98,7 @@
     "packages/app/src/components/amicode-default-model.tsx": "16a2de1feb12e07416fe5fbb25879391f912ee0909b553c868c1b531f2ed1f2d",
     "packages/app/src/components/amicode-defaults-capsule.tsx": "94dc081bc47abb7e50566fcd8e9e53124f9d7632d61f93eff4f1627e0c2efb2d",
     "packages/app/src/components/amicode-file-ref-bridge.tsx": "11c17d7fdb29d16530e188b13ee8af728f37d9adfbb518084106ce50cc0c527a",
+    "packages/app/src/components/concise-mode-toggle.tsx": "3eff0c5557143500a27d828a08d1efe09a8c99aac9b6e2f9950bfe70c76162a1",
     "packages/app/src/components/connection-banner.tsx": "c793966e1f9d6f307af697032b235c2ff65afaa04f6cc232e40ce45e5745ded4",
     "packages/app/src/components/dialog-command-palette-v2.css": "85984957adaf15efcc0828310f3a0b438cedaaba776a9fec2eddb3ad83487fa2",
     "packages/app/src/components/dialog-command-palette-v2.tsx": "e12da3e5e9e503089dd9139b20e04f6b566cf74fa445f23a2e193f5883f7c5f3",
@@ -115,7 +116,7 @@
     "packages/app/src/components/pane-bridge.tsx": "756b3306b51c963fac6778716f6c6c4626f0f3bf75c93b7cb4cab58ea0bf3d4e",
     "packages/app/src/components/profile-popover.tsx": "eff742e90544455f13234a9351bb1b82189663cba2cd3172bdcea1a8a37284e8",
     "packages/app/src/components/prompt-input-clipboard-structure.test.ts": "946b718c2164da394602f26e4d9919d752da0d0b9bee714f345ba16c274542da",
-    "packages/app/src/components/prompt-input-v2.tsx": "5ab46e41bda4fa11e99f06c37df76c1fd3cce061c6ba7a9f85bee369a965b98a",
+    "packages/app/src/components/prompt-input-v2.tsx": "4a51a7823755514497497def61fd4b890f29e08573d7d727b303d31318f3b265",
     "packages/app/src/components/prompt-input.tsx": "97a9bc55b46cf1f2d7c3e38110e736f7fa9db7f89121d3c013b9650a60d382d4",
     "packages/app/src/components/prompt-project-selector.tsx": "0157c954b938bce2b5aca9a82f4a72338e361f4c9027e55a7fd5a14a1654d294",
     "packages/app/src/components/report-bug-button.css": "909809b6241d53c386aa4c8ea34539ba162a8998fff755834c783025bc53a5fd",
@@ -242,7 +243,7 @@
     "packages/app/src/utils/retry-import.ts": "591bfd3e28f8afa9c4d9f0ca118d20e875cb1dce574c0ae25615994c4fe57a99",
     "packages/app/src/utils/serialize-session.test.ts": "f8fe318f195dca251eae3f4899f4a5881c3523522f59e02fef208588391f4048",
     "packages/app/src/utils/serialize-session.ts": "c303c678500cdb64c7aa6928a0bd984c441a36705fe8152368a0e575cbcb459f",
-    "packages/app/src/utils/server-compat.ts": "01413e13b87485770eb3dbec0b882aec4c8247dafc4dc74b7b4669fa5b20cf1a",
+    "packages/app/src/utils/server-compat.ts": "1cccb1aabde1bce6ee382c33db0dea9273a9519747b805b771dec060d3071b39",
     "packages/app/src/utils/session-message.ts": "96f8f3dca62f70215ac2dccbc8d27cd5b247af3ecea1ac5d34a74ffc8af5d4d3",
     "packages/app/src/utils/start-prompt.ts": "809d8ad0ab6de76a97503f8368ade25f771431be3f92eb8f039a2c65244ab20f",
     "packages/app/src/utils/vscode-explorer-icon-theme.test.ts": "351deb0ff77e62d2585858105aaf34ab621298511798fcb626abee97bd644fe6",
@@ -622,7 +623,7 @@
     "packages/app/src/components/prompt-input/placeholder.ts": "6b2af23a0588e7970cd0dd059fc60c3671c907a76ba3db660483a932f1dce79d",
     "packages/app/src/components/prompt-input/slash-popover.tsx": "a1800173edebcd419802796470f7270acaf0ef689a72f1b81a1cedfd8968337d",
     "packages/app/src/components/prompt-input/submit-stream-gap.test.ts": "68a94b03e75625531b2f2ad161ef9d0b93365f9edae154a797f82031b5bfc062",
-    "packages/app/src/components/prompt-input/submit.ts": "6f14368b0d481bdf10a2711e08da41010edd9f67ca8af90b930c096a56778b89",
+    "packages/app/src/components/prompt-input/submit.ts": "ea6818c3d0570f382b355b31c23ce3c654d726b277c3413dcc2d343c2f4ea555",
     "packages/app/src/components/session/context-warning-banner.tsx": "f5fab4d7a9536238b70d64488fc30d44f6a4948fdcffd910a9666f4b6c296019",
     "packages/app/src/components/session/index.ts": "21473290d4a1a3d0670fd878372ddf21ff22d4a0b30d1aef6c81ea906c1488b4",
     "packages/app/src/components/session/panel-menu.tsx": "42f323046b7375ae158023a51506038eb15f2e1545c407f45acd47446a8ef3e0",
@@ -858,7 +859,9 @@
     "packages/opencode/src/server/routes/instance/httpapi/handlers/file.ts": "10bcb79b117beebee04184fb48c1ad789e782e2f7ae4b0c68603edc00f03aee9",
     "packages/opencode/src/server/routes/instance/httpapi/handlers/mcp.ts": "7da08d58765cdf2b6ce4648fc70de371402949f5bb7b75696f674d43f2d5365b",
     "packages/opencode/src/server/routes/instance/httpapi/handlers/provider.ts": "8baf16cad0992c5351b61b0c0fb27903bb25b17e1b25fc7c5d77f807c24413a6",
-    "packages/opencode/src/server/routes/instance/httpapi/handlers/session.ts": "b37ff4136c4aea85b23083bf441f03e09820e3e4cdd95e4118ca570d8435b94f"
+    "packages/opencode/src/server/routes/instance/httpapi/handlers/session.ts": "b37ff4136c4aea85b23083bf441f03e09820e3e4cdd95e4118ca570d8435b94f",
+    "packages/app/src/context/concise-mode.ts": "b03ac887222543e590d31781c944e69aca97bff32a661751dd817d46bf4ead64",
+    "packages/app/src/context/concise-mode.test.ts": "534258a1d82d66bd8b482bb3a8ca6a24d508328505abd0f7f52e1b75cdf57fa2"
   },
   "symlinks": [
     "packages/app/public/amico.svg"
@@ -873,10 +876,10 @@
     "packages/ui/src/v2/components/text-shimmer-v2.tsx"
   ],
   "exceptions": [],
-  "extracted_at": "2026-09-24T04:46:38.771Z",
+  "extracted_at": "2026-09-30T02:26:16.851Z",
   "per_package": {
     "packages/app": {
-      "A": 186,
+      "A": 189,
       "M": 157,
       "D": 0
     },
@@ -922,7 +925,7 @@
     }
   },
   "counts": {
-    "overlay_total": 851,
+    "overlay_total": 854,
     "deletions": 7,
     "server_coupled": 0
   },
@@ -1017,6 +1020,7 @@
     "packages/app/src/components/amicode-default-model.tsx": "A",
     "packages/app/src/components/amicode-defaults-capsule.tsx": "A",
     "packages/app/src/components/amicode-file-ref-bridge.tsx": "A",
+    "packages/app/src/components/concise-mode-toggle.tsx": "A",
     "packages/app/src/components/connection-banner.tsx": "A",
     "packages/app/src/components/dialog-command-palette-v2.css": "M",
     "packages/app/src/components/dialog-command-palette-v2.tsx": "M",
@@ -1777,7 +1781,9 @@
     "packages/opencode/src/server/routes/instance/httpapi/handlers/file.ts": "M",
     "packages/opencode/src/server/routes/instance/httpapi/handlers/mcp.ts": "M",
     "packages/opencode/src/server/routes/instance/httpapi/handlers/provider.ts": "M",
-    "packages/opencode/src/server/routes/instance/httpapi/handlers/session.ts": "M"
+    "packages/opencode/src/server/routes/instance/httpapi/handlers/session.ts": "M",
+    "packages/app/src/context/concise-mode.ts": "A",
+    "packages/app/src/context/concise-mode.test.ts": "A"
   },
   "upstream_base_archive_sha256": "4b5f2e5edfc796082a353fd09c1b1dec3e7a108a4b080fe3a86b12d9fa59fae6"
 }

packages/app-bundle/overlay/packages/app/src/components/concise-mode-toggle.tsx

@@ -0,0 +1,21 @@
+// amicode: concise-mode toggle for the v2 composer's bottom control row.
+// A real switch (not an icon) — flipping it does NOT send a message; it sets a
+// persistent per-session flag that, while on, attaches a concise directive to
+// the NEXT message you send (as the invisible per-turn system instruction), so
+// the response comes back concise. Turning it off stops that. The switch's own
+// accent/checked styling (switch-v2.css) carries the on state; the "Concise"
+// label is self-explanatory, so there is no tooltip.
+import { Switch } from "@opencode-ai/ui/v2/switch-v2"
+
+export function ConciseModeToggle(props: { active: boolean; disabled?: boolean; onToggle: (next: boolean) => void }) {
+  return (
+    <Switch
+      data-action="concise-mode"
+      checked={props.active}
+      disabled={props.disabled}
+      onChange={(next) => props.onToggle(next)}
+    >
+      Concise
+    </Switch>
+  )
+}

packages/app-bundle/overlay/packages/app/src/components/prompt-input-v2.tsx

@@ -7,9 +7,12 @@ import { KeybindV2 } from "@opencode-ai/ui/v2/keybind-v2"
 import { TooltipV2 } from "@opencode-ai/ui/v2/tooltip-v2"
 import type { ReferenceInfo } from "@opencode-ai/sdk/v2/client"
 import { createEffect, createMemo, on, onCleanup, Show } from "solid-js"
+import { useSearchParams } from "@solidjs/router"
+import { bindConcise, conciseKey, conciseMode } from "@/context/concise-mode"
 import { ModelSelectorPopoverV2 } from "@/components/dialog-select-model"
 import { DialogSelectModelUnpaidV2 } from "@/components/dialog-select-model-unpaid-v2"
 import { ReportBugButton } from "@/components/report-bug-button"
+import { ConciseModeToggle } from "@/components/concise-mode-toggle"
 import type { PromptInputProps } from "@/components/prompt-input/contracts"
 import { normalizePromptHistoryEntry, promptLength, type PromptHistoryComment } from "@/components/prompt-input/history"
 import { createPersistedPromptInputHistory } from "@/components/prompt-input/history-store"
@@ -48,6 +51,10 @@ export type PromptInputV2ComposerProps = {
 export type PromptInputV2ControllerProps = Omit<PromptInputProps, "class" | "submission">
 export type PromptInputV2ComposerController = PromptInputV2Interaction & {
   readonly model: PromptInputProps["controls"]["model"]
+  // amicode: the concise-mode toggle state + setter, surfaced to the composer's
+  // trailing controls. `on` is a reactive accessor; `set` flips a persistent
+  // per-session flag — it sends nothing. The flag is read at submit time.
+  readonly concise: { readonly on: () => boolean; readonly set: (next: boolean) => void }
 }
 
 export function PromptInputV2Composer(props: PromptInputV2ComposerProps) {
@@ -56,7 +63,7 @@ export function PromptInputV2Composer(props: PromptInputV2ComposerProps) {
   const language = useLanguage()
 
   return (
-    <div class="flex flex-col gap-3">
+    <div class="amicode-composer-cq flex flex-col gap-3">
       <PromptInputV2
         controller={props.controller}
         borderUnderlay={props.borderUnderlay}
@@ -67,7 +74,17 @@ export function PromptInputV2Composer(props: PromptInputV2ComposerProps) {
         // amicode/opencode#116: report-a-bug, right-anchored immediately left
         // of send. The boot-param gate lives HERE (not inside the button) so a
         // gated-off button passes `undefined` and the row's layout never shifts.
-        trailingControl={bugReportEnabled() ? <ReportBugButton /> : undefined}
+        trailingControl={
+          <>
+            <div class="amicode-concise-toggle-wrap flex items-center">
+              <ConciseModeToggle
+                active={props.controller.concise.on()}
+                onToggle={(next) => props.controller.concise.set(next)}
+              />
+            </div>
+            {bugReportEnabled() ? <ReportBugButton /> : undefined}
+          </>
+        }
         modelControl={
           <PromptInputV2ModelControl
             loading={props.controller.model.loading}
@@ -216,6 +233,21 @@ export function usePromptInputV2Controller(props: PromptInputV2ControllerProps):
     if (!id) return permission.isAutoAcceptingDirectory(sdk().directory)
     return permission.isAutoAccepting(id, sdk().directory)
   })
+  // amicode: concise-mode flag. A per-session switch — flipping it sends
+  // nothing; it is read at submit time (createPromptSubmit's `concise`) to attach
+  // the concise directive to the outgoing prose message. #1651: held in the
+  // session-keyed concise store, NOT component state, so a composer remount (new
+  // chat → session, Changes tab, session switch) reads the value back. A new
+  // chat writes under its draft key; submit promotes it to the session key.
+  const [conciseSearch] = useSearchParams<{ draftId?: string }>()
+  const conciseKeyNow = () => {
+    const id = props.controls.session.id
+    return id
+      ? conciseKey.session(sdk().scope, sdk().directory, id)
+      : conciseKey.draft(sdk().scope, sdk().directory, conciseSearch.draftId)
+  }
+  const concise = bindConcise(conciseMode, conciseKeyNow)
+  const conciseOn = concise.on
   const submission = createPromptSubmit({
     prompt,
     info,
@@ -241,6 +273,7 @@ export function usePromptInputV2Controller(props: PromptInputV2ControllerProps):
     onSubmit: props.onSubmit,
     streamGap,
     model: props.controls.model.selection,
+    concise: conciseOn,
   })
 
   const referenceDescription = (reference: ReferenceInfo) =>
@@ -437,6 +470,7 @@ export function usePromptInputV2Controller(props: PromptInputV2ControllerProps):
     },
   })
   Object.defineProperty(controller, "model", { get: () => props.controls.model })
+  Object.defineProperty(controller, "concise", { get: () => concise })
 
   // Framed webview: the window-level fallback (global-clipboard.ts) is the
   // sole ⌘V owner. When the clipboard carries no text it offers the media to

packages/app-bundle/overlay/packages/app/src/components/prompt-input/submit.ts

@@ -20,6 +20,7 @@ import { buildRequestParts } from "./build-request-parts"
 import { setCursorPosition } from "./editor-dom"
 import { formatServerError } from "@/utils/server-errors"
 import { ScopedKey } from "@/utils/server-scope"
+import { conciseKey, conciseMode } from "@/context/concise-mode"
 import { createPromptSubmissionState } from "./submission-state"
 import { normalizeSessionInfo } from "@/utils/session"
 import { Event } from "@opencode-ai/schema/event"
@@ -40,6 +41,9 @@ export type FollowupDraft = {
   agent: string
   model: { providerID: string; modelID: string }
   variant?: string
+  // amicode: per-turn system instruction (e.g. the concise directive). Reaches
+  // the model for this turn but is NOT rendered as a visible message part.
+  system?: string
 }
 
 type FollowupSendInput = {
@@ -56,6 +60,12 @@ const draftText = (prompt: Prompt) => prompt.map((part) => ("content" in part ?
 
 const draftImages = (prompt: Prompt) => prompt.filter((part): part is ImageAttachmentPart => part.type === "image")
 
+// amicode: the concise directive. When the composer's concise switch is on it
+// rides as the message's per-turn `system` instruction (invisible — reaches the
+// model, not rendered as a user part), never appended to the visible text.
+const CONCISE_DIRECTIVE =
+  "Concise mode is on for this message. Respond concisely: lead with the answer or next action, no preamble or closing pleasantries, and keep it tight — without dropping required caveats, questions, or safety confirmations."
+
 export async function sendFollowupDraft(input: FollowupSendInput) {
   const text = draftText(input.draft.prompt)
   const images = draftImages(input.draft.prompt)
@@ -135,6 +145,7 @@ export async function sendFollowupDraft(input: FollowupSendInput) {
     time: { created: Date.now() },
     agent: input.draft.agent,
     model: { ...input.draft.model, variant: input.draft.variant },
+    system: input.draft.system,
   }
 
   const add = () =>
@@ -172,6 +183,7 @@ export async function sendFollowupDraft(input: FollowupSendInput) {
       agent: input.draft.agent,
       model: input.draft.model,
       variant: input.draft.variant,
+      system: input.draft.system,
       legacyParts: requestParts,
       text: requestParts.flatMap((part) => (part.type === "text" ? [part.text] : [])).join("\n"),
       files: requestParts.flatMap((part) => {
@@ -234,6 +246,12 @@ type PromptSubmitInput = {
    *  notice instead of optimistically posting into a dead tunnel. */
   streamGap?: Accessor<boolean>
   model?: ModelSelection
+  /** amicode: when true at send time, the concise directive rides as the
+   *  message's per-turn `system` instruction (normal prose turns only) so the
+   *  response comes back concise — the composer's concise switch drives this.
+   *  #1651: the switch is session-keyed; a new chat's value is promoted to the
+   *  created session below. */
+  concise?: Accessor<boolean>
 }
 
 export function createPromptSubmit(input: PromptSubmitInput) {
@@ -372,6 +390,10 @@ export function createPromptSubmit(input: PromptSubmitInput) {
     const permissionState = permission.currentServerState()
     const isNewSession = !params.id
     const shouldAutoAccept = isNewSession && input.autoAccept()
+    // amicode#1651: read the concise switch (and the new chat's draft key) NOW,
+    // before any await — once the session exists the composer's key moves to it.
+    const conciseAtSend = input.concise?.() ?? false
+    const conciseDraftKey = conciseKey.draft(sdk().scope, projectDirectory, search.draftId)
     const worktreeSelection = input.newSessionWorktree?.() || "main"
 
     let sessionDirectory = projectDirectory
@@ -444,6 +466,8 @@ export function createPromptSubmit(input: PromptSubmitInput) {
             model: { providerID: currentModel.provider.id, modelID: currentModel.id },
             variant: variant ?? null,
           })
+          // amicode#1651: the new chat's concise switch follows it into the session.
+          conciseMode.promote(conciseDraftKey, conciseKey.session(sdk().scope, sessionDirectory, session.id))
           layout.handoff.setTabs(base64Encode(sessionDirectory), session.id)
           const draftID = search.draftId
           if (draftID) tabs.promoteDraft(draftID, { server: tabs.draft(draftID).server, sessionId: session.id })
@@ -473,6 +497,7 @@ export function createPromptSubmit(input: PromptSubmitInput) {
       agent,
       model,
       variant,
+      system: conciseAtSend ? CONCISE_DIRECTIVE : undefined,
     }
 
     const clearInput = () => {