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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.212 16 Jul 2026

Subagent Mode Parameter Deprecated

The mode parameter for the Agent tool in teammate/subagent contexts is now marked as deprecated: "Deprecated; ignored. Subagents inherit the parent session's permission mode; agent-definition frontmatter may override it." Previously this produced different error text referencing mode as unavailable.

Evidence

"Deprecated; ignored. Subagents inherit the parent session's permission mode" (search for the string directly)

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.212 →