Unclear What the warning says is not stated.
What
Auto-compact is when Claude Code summarises the conversation so far to free up room in the model's memory. The auto-compact window sets how full that memory can get, in tokens, before this happens. CLAUDE_CODE_AUTO_COMPACT_WINDOW is an environment variable, a value set in your shell, that sets this window. This release changes how it is read and shown:
- The value is read by a new parser. It accepts shorthand such as
200kor1M, and a bare number between 100 and 1000 is treated as thousands. - Values that are too small or too large are brought up to the minimum or down to the maximum, with a warning in the log or in headless output.
- A value that cannot be read at all is ignored, with the message that it "isn't a usable size, so Claude Code ignores it." Before, an invalid value was dropped without a visible warning.
- At startup in interactive mode, the variable is checked and a warning is raised if needed.
- The auto-compact window entry in
/confignow shows an extra warning-coloured line built from the environment variable. Its exact wording was not read. Before, the only extra line was "Auto-compact is currently disabled (see /config)".
Why
A mistyped window size now produces a warning instead of quietly having no effect, and the settings screen points out when the environment variable is in play.
Names in the bundle/config
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 /config, on Connect to external tools with MCP.
To choose the first-turn wait yourself, set `CLAUDE_CODE_MCP_STARTUP_WAIT_MS` in the [`env` option](/docs/en/agent-sdk/configuration#set-environment-variables), for example `CLAUDE_CODE_MCP_STARTUP_WAIT_MS: "5000"`. The first turn then wai…agent-sdk/mcp see the edit
Added since
A small documentation edit on Use Claude Science on a corporate network touched a line naming /config after this was published.
The `[network] ca_bundle` key in `config.toml` points at a PEM file whose certificates Claude Science adds to its default trust for sign-in, the Claude API, Anthropic-hosted connectors, update checks, and [cloud storage](/docs/claude-scien…claude-science/corporate-networks see the edit
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What the warning says is not stated.
Anthropic's documentation agrees
A small documentation edit on Use Claude Science on a corporate network touched a line naming /config after this was published.
Anthropic's release notes agree
Fixed the organization policy not refreshing until the hourly check after approving an ANTHROPIC_API_KEY at startup or switching "Use custom…