> Markdown version of [/events/world-congress-2026-north-america/sessions/1730-making-and-breaking](https://www.wearedevelopers.com/events/world-congress-2026-north-america/sessions/1730-making-and-breaking). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

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# Making (and Breaking) Agents by Adding 1,000 MCP Tools


- **Event:** World Congress 2026 North America

## Description

What happens when you actually try to use MCP at scale? In this talk, I'll build an agent live on stage, connect it to 1,000+ tools via MCP, and show exactly what breaks: context explosion, ambiguous routing, and security vulnerabilities from indirect prompt injection.

Then I'll show how to fix it. I'll cover dynamic tool discovery (reducing context from 500 tools to 1-2), code-mode execution, and why every MCP tool is a trust boundary your security team should care about.

This isn't specifically MCP advocacy as thes issues go beyond MCP and affect any agent that needs tools (and any modern agent is very tool hungry). It's a practitioner's guide to what works (and doesn't) when you scale MCP tools.

## Speaker

### [Guillaume Lebedel](https://www.wearedevelopers.com/@guillaume-lebedel)

Stackone, CTO & Co-Founder


## Related talks at this congress

- [The MCP haters are half right](https://www.wearedevelopers.com/events/world-congress-2026-north-america/sessions/1738-the-mcp-haters-are) — Vojta Kopal
- [MicroAgents: The Microservices of the Agentic Era](https://www.wearedevelopers.com/events/world-congress-2026-north-america/sessions/1692-microagents-the) — Ashish Shubham
- [Securing AI Agent Infrastructure: Identity, Attestation, and Trust at Scale](https://www.wearedevelopers.com/events/world-congress-2026-north-america/sessions/1432-securing-ai-agent) — Abdel Fane
- [Give the Agent a Budget, Not a Token](https://www.wearedevelopers.com/events/world-congress-2026-north-america/sessions/1695-give-the-agent-a) — Sachin Malhotra

## Watch remotely

Can’t make it to San José? Watch this session live with Pro. You also get:

- All full videos, bookmarks, and playlists
- World Congress livestreams

[See pricing](https://www.wearedevelopers.com/pricing)

## Links

- [Get tickets](https://www.wearedevelopers.com/world-congress-north-america/tickets)