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HomeDocsClaude Code CLI 27 Oct 2026
One change · claude-code

Run Claude Code programmatically changedheadless

Nearest release: v2.1.312, published under an hour before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 27 Oct 2026 19:25 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 27 Oct 2026 19:37 UTC.

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From line 232 where the diff opens
First seen 14 Aug 2026 this site's first read of the page
Recorded edits46to this page, all time

The whole hunk

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233233If some of these messages are missing from your stream, check your Claude Code version against these minimums:
234234 
235* **Forwarding at every nesting depth**: v2.1.219 or later
236235* **A forked skill that Claude starts with the Skill tool from the main conversation**: v2.1.86 or later for its `tool_use` and `tool_result` blocks, and v2.1.265 or later for its first `user` message and its text and thinking blocks
237236* **Messages of subagents that a forked skill spawns, and of forked skills started inside a subagent or another forked skill**: v2.1.275 or later
238237* **Messages of a forked skill you start by passing `/<skill-name>` as the prompt**: v2.1.287 or later
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281280| Field | Type | Description |
282281| - | - | - |
283282| `mcp_servers` | array | MCP servers in the session, each with `name` and `status` |
284| `mcp_server_errors` | array | `--mcp-config` entries skipped by config validation, each with `name`, `type`, and `message`. `type` is a skip category such as `unknown_type`, `url_missing_type`, `invalid_config`, or `reserved_name`; treat values you don't recognize as a generic skip. Affected servers are absent from `mcp_servers`. The key is omitted when there are no errors, so a CI gate can fail on a non-empty array. Requires Claude Code v2.1.219 or later |
283| `mcp_server_errors` | array | `--mcp-config` entries skipped by config validation, each with `name`, `type`, and `message`. `type` is a skip category such as `unknown_type`, `url_missing_type`, `invalid_config`, or `reserved_name`; treat values you don't recognize as a generic skip. Affected servers are absent from `mcp_servers`. The key is omitted when there are no errors, so a CI gate can fail on a non-empty array |
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286When you run the command by hand in a terminal, Claude Code also prints a startup warning to stderr, such as `Warning: 1 MCP server skipped due to invalid config:`, followed by the reason for each skipped entry. When you redirect stderr, or when a program such as a CI runner or an SDK host captures it, Claude Code prints no warning and reports the skipped entries only in the `mcp_server_errors` field. The warning requires Claude Code v2.1.219 or later.
285When you run the command yourself in a terminal, Claude Code also prints a startup warning to stderr, such as `Warning: 1 MCP server skipped due to invalid config:`, followed by the reason for each skipped entry.
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287When you redirect stderr, or when a program such as a CI runner or an SDK host captures it, Claude Code prints no warning. It reports the skipped entries only in the `mcp_server_errors` field.
287288 
288289#### Track plugin installs
289290 
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