What
An account memory server is an MCP server, a plug-in tool provider, that stores things Claude remembers about you across sessions. Subagents are helper agents Claude starts to handle part of a task. They now have restricted access to that memory.
- The server can advertise an experimental capability named
anthropic/memory. Itssubagent_memoryfield can beall,read_onlyornone, andsubagent_notecan hold up to 4096 characters.- If several servers set it, the most restrictive value wins.
- A value that cannot be read counts as
none. - If no server sets it, the mode is
read_only.
- The tools handed to a subagent are filtered by a new
subagentMemoryMode. Tools from the memory server are removed unless they are on a read-only list, andnoneremoves them all. - Forked slash commands and observer agents now pass the current permission mode as
subagentMemoryModewhen their tools are chosen. - A subagent, teammate, fork or backgrounded query that tries to change account memory is refused. The message says only the session's main agent can change it, and asks it to say in its reply what should be saved.
- Subagents no longer see the memory server's resources, and reading one directly fails with a message pointing them to the server's tools.
- Separately,
--resumenow records the source session'ssourceSessionIdandtranscriptPath.
Why
Helper agents can no longer freely rewrite what Claude remembers about you. Changes to account memory go through the main agent, and the memory server decides how much subagents may read.
Names in the bundle--resume
--resume
Claude Code changelog modified, high confidence
* Fixed more cases of continued or resumed sessions (`--continue`, `--resume`) re-sending earlier messages in a changed form, which could make the API drop Claude's earlier reasoningsee the edit
--resume
Changelog modified, high confidence
* Changed session deletion to also remove the session's Claude Code transcript and related files from your computer, so `claude --resume` can no longer reopen it.see the edit
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
Confirmed since
Anthropic's documentation has since written up --resume, on Hooks reference.
`SessionStart` at launch, including with `--continue` or `--resume`, and every `Setup` event fire before the session's MCP servers are available to hooks. Claude Code skips their `mcp_tool` hooks without calling the tool, and the [debug lo…hooks see the edit
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
It is not clear what the new record or the passed permission mode changes for you in practice.
Anthropic's documentation agrees
--resume on Claude Code changelog