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Log config update agent stdout & stderr if needed

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This commit is contained in:
Konstantin Wohlwend 2026-06-26 15:37:29 -07:00
parent 74471d8d30
commit 32e5a1ccbc
1 changed files with 38 additions and 1 deletions
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39
packages/shared-backend/src/index.ts
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@ -14,6 +14,7 @@ const jiti = createJiti(import.meta.url, { moduleCache: false });
const LOG_PREFIX = "[Stack config updater]";
const DEFAULT_AGENT_TIMEOUT_MS = 120_000;
const CONFIG_UPDATE_LOG_PATH_LIMIT = 40;
const AGENT_OUTPUT_LOG_MAX_LENGTH = 20_000;
type ConfigModule = {
config?: unknown,
@ -44,6 +45,31 @@ function configUpdatePathDetailsForLog(changes: ConfigChange[]): Record<string,
};
}
function appendBoundedAgentOutput(current: string, chunk: string): string {
const next = `${current}${chunk}`;
if (next.length <= AGENT_OUTPUT_LOG_MAX_LENGTH) {
return next;
}
return next.slice(next.length - AGENT_OUTPUT_LOG_MAX_LENGTH);
}
function stringifyAgentMessageForLog(message: unknown): string {
try {
return `${JSON.stringify(message)}\n`;
} catch {
return `${String(message)}\n`;
}
}
function agentOutputDetailsForLog(agentStdout: string, agentStderr: string): Record<string, unknown> {
return {
agentStdout,
agentStdoutTruncated: agentStdout.length >= AGENT_OUTPUT_LOG_MAX_LENGTH,
agentStderr,
agentStderrTruncated: agentStderr.length >= AGENT_OUTPUT_LOG_MAX_LENGTH,
};
}
function isConfigModule(value: unknown): value is ConfigModule {
return value !== null && typeof value === "object";
}
@ -237,6 +263,8 @@ async function runConfigUpdateAgent(options: {
const timeoutMs = parseAgentTimeoutMs();
const deniedOutOfBoundsWrites = new Set<string>();
const startedAtMs = performance.now();
let agentStdout = "";
let agentStderr = "";
console.log(`${LOG_PREFIX} Starting config update agent`, {
cwd: options.cwd,
timeoutMs,
@ -248,7 +276,13 @@ async function runConfigUpdateAgent(options: {
allowedTools: ["Read", "Write", "Edit", "Glob", "Grep"],
strictIsolation: true,
timeoutMs,
stderr: (data) => { console.warn(`${LOG_PREFIX} [agent] ${data}`); },
stderr: (data) => {
agentStderr = appendBoundedAgentOutput(agentStderr, data);
console.warn(`${LOG_PREFIX} [agent] ${data}`);
},
onMessage: (message) => {
agentStdout = appendBoundedAgentOutput(agentStdout, stringifyAgentMessageForLog(message));
},
onPreToolUse: (input) => {
const target = getToolWriteTargetPath(input.tool_name, input.tool_input, options.cwd);
if (target == null) return { continue: true };
@ -273,6 +307,7 @@ async function runConfigUpdateAgent(options: {
timeoutMs,
elapsedMs: Math.round(performance.now() - startedAtMs),
...formatConfigUpdaterErrorForLog(error),
...agentOutputDetailsForLog(agentStdout, agentStderr),
});
throw new Error(`Config update agent timed out after ${timeoutMs}ms. It was unable to apply the config changes to the file.`);
}
@ -282,6 +317,7 @@ async function runConfigUpdateAgent(options: {
timeoutMs,
elapsedMs: Math.round(performance.now() - startedAtMs),
...formatConfigUpdaterErrorForLog(error),
...agentOutputDetailsForLog(agentStdout, agentStderr),
});
throw new Error(`${error.message} It was unable to apply the config changes to the file.`);
}
@ -290,6 +326,7 @@ async function runConfigUpdateAgent(options: {
timeoutMs,
elapsedMs: Math.round(performance.now() - startedAtMs),
...formatConfigUpdaterErrorForLog(error),
...agentOutputDetailsForLog(agentStdout, agentStderr),
});
throw error;
}