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import { resolve } from "node:path";
import type { ExecBackendResolver } from "@dispatch/exec-backend";
import type { ToolContract, ToolExecuteContext, ToolResult } from "@dispatch/kernel";
const DEFAULT_TIMEOUT = 120_000;
const OUTPUT_CAP = 50_000;
export interface ValidatedArgs {
readonly command: string;
readonly timeout: number;
}
export interface SpawnResult {
readonly exitCode: number | null;
readonly timedOut: boolean;
readonly aborted: boolean;
}
export function validateArgs(args: unknown): ValidatedArgs | { readonly error: string } {
if (args === null || args === undefined || typeof args !== "object") {
return { error: "Error: Arguments must be an object." };
}
const obj = args as Record<string, unknown>;
const rawCommand = obj.command;
if (typeof rawCommand !== "string" || rawCommand.trim().length === 0) {
return { error: 'Error: Missing or empty "command" parameter (must be a non-empty string).' };
}
let timeout = DEFAULT_TIMEOUT;
if (obj.timeout !== undefined) {
const n = Number(obj.timeout);
if (!Number.isFinite(n) || n < 1) {
return { error: 'Error: Invalid "timeout" parameter (must be a positive number).' };
}
timeout = Math.floor(n);
}
return { command: rawCommand, timeout };
}
export function truncateOutput(output: string, cap: number): string {
if (output.length <= cap) {
return output;
}
const truncated = output.slice(0, cap);
return `${truncated}\n\n[Output truncated: exceeded ${cap} characters]`;
}
export function buildResult(params: {
readonly exitCode: number | null;
readonly timedOut: boolean;
readonly aborted: boolean;
readonly output: string;
readonly cap: number;
}): ToolResult {
if (params.aborted) {
return {
content: truncateOutput(params.output, params.cap),
isError: true,
};
}
if (params.timedOut) {
const content = truncateOutput(params.output, params.cap);
return {
content: `${content}\n\n[Command timed out]`,
isError: true,
};
}
const exitCode = params.exitCode;
if (exitCode !== null && exitCode !== 0) {
return {
content: truncateOutput(params.output, params.cap),
isError: true,
};
}
return {
content: truncateOutput(params.output, params.cap),
};
}
export function createRunShellTool(deps: {
readonly workdir: string;
readonly resolveBackend: ExecBackendResolver;
readonly outputCap?: number;
}): ToolContract {
const workdir = resolve(deps.workdir);
const cap = deps.outputCap ?? OUTPUT_CAP;
return {
name: "run_shell",
description:
"Execute a shell command and return its output. " +
"Use for running CLI tools, scripts, or system commands.",
parameters: {
type: "object",
properties: {
command: {
type: "string",
description: "The shell command to execute.",
},
timeout: {
type: "number",
description: `Timeout in milliseconds (default: ${DEFAULT_TIMEOUT}).`,
default: DEFAULT_TIMEOUT,
},
},
required: ["command"],
},
concurrencySafe: false,
async execute(args: unknown, ctx: ToolExecuteContext): Promise<ToolResult> {
const validated = validateArgs(args);
if ("error" in validated) {
return { content: validated.error, isError: true };
}
const { command, timeout } = validated;
const effectiveCwd = ctx.cwd ? resolve(ctx.cwd) : workdir;
if (ctx.signal.aborted) {
return buildResult({
exitCode: null,
timedOut: false,
aborted: true,
output: "",
cap,
});
}
let output = "";
const appendOutput = (data: string, _stream: "stdout" | "stderr") => {
output += data;
};
const backend = deps.resolveBackend(ctx.computerId);
let spawnResult: SpawnResult;
try {
spawnResult = await backend.spawn({
command,
cwd: effectiveCwd,
signal: ctx.signal,
timeout,
onOutput: (data, stream) => {
ctx.onOutput(data, stream);
appendOutput(data, stream);
},
});
} catch (err: unknown) {
if (ctx.signal.aborted) {
return buildResult({
exitCode: null,
timedOut: false,
aborted: true,
output,
cap,
});
}
return {
content: `Error spawning command: ${err instanceof Error ? err.message : String(err)}`,
isError: true,
};
}
return buildResult({
exitCode: spawnResult.exitCode,
timedOut: spawnResult.timedOut,
aborted: spawnResult.aborted,
output,
cap,
});
},
};
}
|
