Where does the bug appear (feature/product)? Cursor IDE Describe the Bug Cursor agent is unable to access additional_context when in the output of postToolUse In this conversation you can even see the confirmation from the leaked thinking from composer 2 [image] Steps to Reproduce Create a post…

Hey, thanks for the report. This is a confirmed bug. additional_context in postToolUse hooks is accepted and logged correctly, but it isn’t actually delivered to the model context. For non-MCP tools, the hook response is discarded fire-and-forget. For MCP, only updated_mcp_tool_output is used. The …

Cursor hooks additional_context not injected in agent context in postToolUse

Support Bug Reports

Topic		Replies	Views
postToolUse hook's additional_context not injected into agent model context Bug Reports context , hooks	3	55	April 23, 2026
sessionStart hook output is accepted and merged, but the injected context does not reach Agent Window Bug Reports context , hooks , plugins , agents-window	2	72	May 1, 2026
Different hook behavior in regards to CLI vs MCP usage Bug Reports mcp , hooks , agents-window	3	44	April 21, 2026
Native postToolUse hooks accept and log additional_context successfully, but the injected context is not surfaced to the model Bug Reports context , hooks	14	283	May 14, 2026
sessionStart hook additional_context is never injected into agent's initial system context Bug Reports context , hooks	3	92	May 3, 2026

Cursor hooks additional_context not injected in agent context in postToolUse

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