Agents: include runtime shell

src/agents/cli-runner/helpers.ts

@@ -13,6 +13,7 @@ import type { EmbeddedContextFile } from "../pi-embedded-helpers.js";
 import { buildSystemPromptParams } from "../system-prompt-params.js";
 import { resolveDefaultModelForAgent } from "../model-selection.js";
 import { buildAgentSystemPrompt } from "../system-prompt.js";
+import { detectRuntimeShell } from "../shell-utils.js";
 import { buildTtsSystemPromptHint } from "../../tts/tts.js";
 
 const CLI_RUN_QUEUE = new Map<string, Promise<unknown>>();
@@ -193,6 +194,7 @@ export function buildSystemPrompt(params: {
       node: process.version,
       model: params.modelDisplay,
       defaultModel: defaultModelLabel,
+      shell: detectRuntimeShell(),
     },
   });
   const ttsHint = params.config ? buildTtsSystemPromptHint(params.config) : undefined;

src/agents/pi-embedded-runner/compact.ts

@@ -67,6 +67,7 @@ import { buildEmbeddedSystemPrompt, createSystemPromptOverride } from "./system-
 import { splitSdkTools } from "./tool-split.js";
 import type { EmbeddedPiCompactResult } from "./types.js";
 import { formatUserTime, resolveUserTimeFormat, resolveUserTimezone } from "../date-time.js";
+import { detectRuntimeShell } from "../shell-utils.js";
 import { describeUnknownError, mapThinkingLevel, resolveExecToolDefaults } from "./utils.js";
 import { buildTtsSystemPromptHint } from "../../tts/tts.js";
 
@@ -300,6 +301,7 @@ export async function compactEmbeddedPiSessionDirect(
       arch: os.arch(),
       node: process.version,
       model: `${provider}/${modelId}`,
+      shell: detectRuntimeShell(),
       channel: runtimeChannel,
       capabilities: runtimeCapabilities,
       channelActions,
@@ -482,7 +484,9 @@ export async function compactEmbeddedPiSession(
   const globalLane = resolveGlobalLane(params.lane);
   const enqueueGlobal =
     params.enqueue ?? ((task, opts) => enqueueCommandInLane(globalLane, task, opts));
+  return enqueueCommandInLane(sessionLane, () =>
   return enqueueCommandInLane(sessionLane, () =>
     enqueueGlobal(async () => compactEmbeddedPiSessionDirect(params)),
   );
+  );
 }

src/agents/pi-embedded-runner/run/attempt.ts

@@ -77,6 +77,7 @@ import { buildEmbeddedSystemPrompt, createSystemPromptOverride } from "../system
 import { splitSdkTools } from "../tool-split.js";
 import { toClientToolDefinitions } from "../../pi-tool-definition-adapter.js";
 import { buildSystemPromptParams } from "../../system-prompt-params.js";
+import { detectRuntimeShell } from "../../shell-utils.js";
 import { describeUnknownError, mapThinkingLevel } from "../utils.js";
 import { resolveSandboxRuntimeStatus } from "../../sandbox/runtime-status.js";
 import { buildTtsSystemPromptHint } from "../../../tts/tts.js";
@@ -315,6 +316,7 @@ export async function runEmbeddedAttempt(
         node: process.version,
         model: `${params.provider}/${params.modelId}`,
         defaultModel: defaultModelLabel,
+        shell: detectRuntimeShell(),
         channel: runtimeChannel,
         capabilities: runtimeCapabilities,
         channelActions,

src/agents/shell-utils.ts

@@ -59,6 +59,42 @@ function resolveShellFromPath(name: string): string | undefined {
   return undefined;
 }
 
+function normalizeShellName(value: string): string {
+  const trimmed = value.trim();
+  if (!trimmed) return "";
+  return path.basename(trimmed).replace(/\.(exe|cmd|bat)$/i, "");
+}
+
+export function detectRuntimeShell(): string | undefined {
+  const overrideShell = process.env.CLAWDBOT_SHELL?.trim();
+  if (overrideShell) {
+    const name = normalizeShellName(overrideShell);
+    if (name) return name;
+  }
+
+  if (process.platform === "win32") {
+    if (process.env.POWERSHELL_DISTRIBUTION_CHANNEL) {
+      return "pwsh";
+    }
+    return "powershell";
+  }
+
+  const envShell = process.env.SHELL?.trim();
+  if (envShell) {
+    const name = normalizeShellName(envShell);
+    if (name) return name;
+  }
+
+  if (process.env.POWERSHELL_DISTRIBUTION_CHANNEL) return "pwsh";
+  if (process.env.BASH_VERSION) return "bash";
+  if (process.env.ZSH_VERSION) return "zsh";
+  if (process.env.FISH_VERSION) return "fish";
+  if (process.env.KSH_VERSION) return "ksh";
+  if (process.env.NU_VERSION || process.env.NUSHELL_VERSION) return "nu";
+
+  return undefined;
+}
+
 export function sanitizeBinaryOutput(text: string): string {
   const scrubbed = text.replace(/[\p{Format}\p{Surrogate}]/gu, "");
   if (!scrubbed) return scrubbed;

src/agents/system-prompt-params.ts

@@ -17,6 +17,7 @@ export type RuntimeInfoInput = {
   node: string;
   model: string;
   defaultModel?: string;
+  shell?: string;
   channel?: string;
   capabilities?: string[];
   /** Supported message actions for the current channel (e.g., react, edit, unsend) */

src/agents/system-prompt.ts

@@ -155,6 +155,7 @@ export function buildAgentSystemPrompt(params: {
     node?: string;
     model?: string;
     defaultModel?: string;
+    shell?: string;
     channel?: string;
     capabilities?: string[];
     repoRoot?: string;
@@ -576,6 +577,7 @@ export function buildRuntimeLine(
     node?: string;
     model?: string;
     defaultModel?: string;
+    shell?: string;
     repoRoot?: string;
   },
   runtimeChannel?: string,
@@ -594,6 +596,7 @@ export function buildRuntimeLine(
     runtimeInfo?.node ? `node=${runtimeInfo.node}` : "",
     runtimeInfo?.model ? `model=${runtimeInfo.model}` : "",
     runtimeInfo?.defaultModel ? `default_model=${runtimeInfo.defaultModel}` : "",
+    runtimeInfo?.shell ? `shell=${runtimeInfo.shell}` : "",
     runtimeChannel ? `channel=${runtimeChannel}` : "",
     runtimeChannel
       ? `capabilities=${runtimeCapabilities.length > 0 ? runtimeCapabilities.join(",") : "none"}`