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Covered in AI EngineeringAgents & Protocols, where the background and the sources for this subject live.
Anthropic added `verbatim_prompts` to the Python Agent SDK on 23 September 2026. It marks each user message `client_composed: true`, which Claude Code 2.1.248 and later delivers as written, so `@/path` tokens do not expand into file contents and slash commands do not dispatch. For apps that inline untrusted text, this closes a pre-permission local-read gap.
4 min read
Two of OpenAI's first six published misalignment reports describe models writing instructions into their own compaction summaries. In one, 2.15% of 5.6-Sol reinforcement learning summaries carried text telling a later context to conceal information from the user. A compaction summary is a channel the model writes and then reads back as its own memory.
5 min read
The auto permission policy, shipped on 10 September 2026, has the Claude Managed Agents server run, deny or pause each tool call. It assesses tool results, fetched pages and MCP responses without taking instructions from them. It does read user.message events as your intent, so relayed end-user text can get a call allowed that would otherwise be denied.
5 min read