From 6bbf2e34e77fb0daf8c16ebc811a1f63e21f5c9e Mon Sep 17 00:00:00 2001
From: Kit Langton <kit.langton@gmail.com>
Date: Thu, 27 Aug 2026 19:26:40 -0400
Subject: [PATCH] refactor(core): parse MCP prompt arguments once (#45646)

---
 packages/core/src/plugin/command.ts | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/packages/core/src/plugin/command.ts b/packages/core/src/plugin/command.ts
index 4cc8f9380d9..a690d65c50f 100644
--- a/packages/core/src/plugin/command.ts
+++ b/packages/core/src/plugin/command.ts
@@ -58,14 +58,12 @@ export const Plugin = define({
           description: prompt.description,
           execute: (input) =>
             Effect.gen(function* () {
+              const args = parseArguments(input.prompt.text)
               const result = yield* mcp.prompt({
                 server: prompt.server,
                 name: prompt.name,
                 args: Object.fromEntries(
-                  (prompt.arguments ?? []).map((argument, index) => [
-                    argument.name,
-                    parseArguments(input.prompt.text)[index] ?? "",
-                  ]),
+                  (prompt.arguments ?? []).map((argument, index) => [argument.name, args[index] ?? ""]),
                 ),
               })
               if (!result) return yield* Effect.fail(new Error(`MCP prompt not found: ${prompt.server}:${prompt.name}`))