Claude Managed Agents changelog

Every change to Claude Managed Agents that Modelpeers has recorded, newest first, each with the source it came from. The record starts Oct 7, 2026.

All (1)Breaking changes (1)

October 2026

Claude Managed Agents

API at Anthropic

Breaking change3w

Managed Agents web_fetch limited to URLs already seen in the session

In Claude Managed Agents, web_fetch now only fetches URLs that already appeared in the session, to reduce data exfiltration risk. Other URLs return a url_not_in_prior_context error.

Who is affected:: Claude Managed Agents that fetch URLs from system prompts, files or tool output.
What to do:: Send needed URLs in a user.message event.

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