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

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deanrie (Dean Rie) Split this topic March 29, 2026, 6:03am 6

A post was merged into an existing topic: Native postToolUse hooks accept and log additional_context successfully, but the injected context is not surfaced to the model

Topic		Replies	Views
Native postToolUse hooks accept and log additional_context successfully, but the injected context is not surfaced to the model Bug Reports context , hooks	4	95	April 10, 2026
sessionStart hook output is accepted and merged, but the injected context does not reach Agent Window Bug Reports context , hooks , plugins , agents-window	1	42	April 9, 2026
Cursor ingnores `structuredContent` from MCP result Bug Reports mcp , hooks	3	37	March 29, 2026
Cursor IDE subagentStart hook input doesn't include subagent_model Bug Reports hooks , subagents	1	31	April 4, 2026
ACP tool_call events for MCP tools contain no tool identity (title, rawInput empty) Bug Reports mcp , cli , acp	2	49	April 3, 2026

Cursor hooks additional_context not injected in agent context in postToolUse

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