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feat(mom): split long messages instead of truncating

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- Messages > 40k chars are split into multiple Slack messages
- Full tool results now shown in thread (no truncation)
- Main message truncates with 'see thread for full response' if too long
- Keep jsonl log truncation for storage efficiency
This commit is contained in:
Mario Zechner 2025-11-27 19:32:54 +01:00
parent 4f845cdd1b
commit 330e044b55
1 changed files with 33 additions and 13 deletions
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46
packages/mom/src/agent.ts
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@ -377,11 +377,21 @@ export function createAgentRunner(sandboxConfig: SandboxConfig): AgentRunner {
// Track stop reason
let stopReason = "stop";
// Slack message limit is 40,000 characters
// Slack message limit is 40,000 characters - split into multiple messages if needed
const SLACK_MAX_LENGTH = 40000;
const truncateForSlack = (text: string): string => {
if (text.length <= SLACK_MAX_LENGTH) return text;
return text.substring(0, SLACK_MAX_LENGTH - 100) + "\n\n_(truncated - message too long)_";
const splitForSlack = (text: string): string[] => {
if (text.length <= SLACK_MAX_LENGTH) return [text];
const parts: string[] = [];
let remaining = text;
let partNum = 1;
while (remaining.length > 0) {
const chunk = remaining.substring(0, SLACK_MAX_LENGTH - 50);
remaining = remaining.substring(SLACK_MAX_LENGTH - 50);
const suffix = remaining.length > 0 ? `\n_(continued ${partNum}...)_` : "";
parts.push(chunk + suffix);
partNum++;
}
return parts;
};
// Promise queue to ensure ctx.respond/respondInThread calls execute in order
@ -404,6 +414,13 @@ export function createAgentRunner(sandboxConfig: SandboxConfig): AgentRunner {
}
});
},
// Enqueue a message that may need splitting
enqueueMessage(text: string, target: "main" | "thread", errorContext: string): void {
const parts = splitForSlack(text);
for (const part of parts) {
this.enqueue(() => (target === "main" ? ctx.respond(part) : ctx.respondInThread(part)), errorContext);
}
},
flush(): Promise<void> {
return this.chain;
},
@ -471,8 +488,6 @@ export function createAgentRunner(sandboxConfig: SandboxConfig): AgentRunner {
? formatToolArgsForSlack(event.toolName, pending.args as Record<string, unknown>)
: "(args not found)";
const duration = (durationMs / 1000).toFixed(1);
const threadResult = truncate(resultStr, 2000);
let threadMessage = `*${event.isError ? "✗" : "✓"} ${event.toolName}*`;
if (label) {
threadMessage += `: ${label}`;
@ -483,9 +498,9 @@ export function createAgentRunner(sandboxConfig: SandboxConfig): AgentRunner {
threadMessage += "```\n" + argsFormatted + "\n```\n";
}
threadMessage += "*Result:*\n```\n" + threadResult + "\n```";
threadMessage += "*Result:*\n```\n" + resultStr + "\n```";
queue.enqueue(() => ctx.respondInThread(truncateForSlack(threadMessage)), "tool result thread");
queue.enqueueMessage(threadMessage, "thread", "tool result thread");
// Show brief error in main message if failed
if (event.isError) {
@ -544,15 +559,15 @@ export function createAgentRunner(sandboxConfig: SandboxConfig): AgentRunner {
// Post thinking to main message and thread
for (const thinking of thinkingParts) {
log.logThinking(logCtx, thinking);
queue.enqueue(() => ctx.respond(truncateForSlack(`_${thinking}_`)), "thinking main");
queue.enqueue(() => ctx.respondInThread(truncateForSlack(`_${thinking}_`)), "thinking thread");
queue.enqueueMessage(`_${thinking}_`, "main", "thinking main");
queue.enqueueMessage(`_${thinking}_`, "thread", "thinking thread");
}
// Post text to main message and thread
if (text.trim()) {
log.logResponse(logCtx, text);
queue.enqueue(() => ctx.respond(truncateForSlack(text)), "response main");
queue.enqueue(() => ctx.respondInThread(truncateForSlack(text)), "response thread");
queue.enqueueMessage(text, "main", "response main");
queue.enqueueMessage(text, "thread", "response thread");
}
}
break;
@ -583,7 +598,12 @@ export function createAgentRunner(sandboxConfig: SandboxConfig): AgentRunner {
.join("\n") || "";
if (finalText.trim()) {
try {
await ctx.replaceMessage(truncateForSlack(finalText));
// For the main message, truncate if too long (full text is in thread)
const mainText =
finalText.length > SLACK_MAX_LENGTH
? finalText.substring(0, SLACK_MAX_LENGTH - 50) + "\n\n_(see thread for full response)_"
: finalText;
await ctx.replaceMessage(mainText);
} catch (err) {
const errMsg = err instanceof Error ? err.message : String(err);
log.logWarning("Failed to replace message with final text", errMsg);