# Apify blog shows how vague input schemas trip up AI agents using its Reddit Actor

> A developer describes connecting their Apify Reddit Actor to an AI agent via the Apify MCP server, only to find the agent produced garbage data because the input schema lacked clear descriptions.

- Canonical: https://extractfeed.io/story/apify-blog-shows-how-vague-input-schemas-trip-up-ai-agents-u-c7c44b2/
- JSON: https://extractfeed.io/api/v1/stories/apify-blog-shows-how-vague-input-schemas-trip-up-ai-agents-u-c7c44b2.json
- Beat: Agents & MCP · Evidence: Primary source · Type/significance: analysis/2 · First seen: 2026-10-01T00:46:23.379949+00:00 · Updated: 2026-10-01T00:46:23.379949+00:00 · Edition: 2026-11-05
- Framing: model-written (headline, standfirst, why it matters, tags); source facts deterministic

## Briefing
- Apify: A developer describes connecting their Apify Reddit Actor to an AI agent via the Apify MCP server, only to find the agent produced garbage data because the input schema lacked clear descriptions.

## Why it matters
This post highlights a growing pain in the MCP ecosystem: AI agents cannot infer intent from schemas alone. As more developers expose tools through MCP servers, the quality of input descriptions becomes critical. The lesson is that schema design must shift from human-readable to agent-optimized, or users will blame the tool, not the documentation.

## Sources
- Primary source · Apify · 2026-09-30 — [I gave my Reddit Actor to an AI agent, and it made all the same mistakes I did](https://blog.apify.com/reddit-actor-ai-agent-input-schema/)

## Watch next
Will schema-generation tools emerge that automatically produce agent-friendly descriptions from existing Actor code?

Topics: Apify, Reddit Actor, Apify MCP server, mcp-server, input-schema, ai-agents, reddit-actor, apify

---
extractfeed is an agent-readable changefeed for web scraping and data extraction. Index: https://extractfeed.io/agents.md