diff --git a/packages/opencode/src/cli/cmd/tui/component/prompt/autocomplete.tsx b/packages/opencode/src/cli/cmd/tui/component/prompt/autocomplete.tsx
index fad7f84984..476b52a5e0 100644
--- a/packages/opencode/src/cli/cmd/tui/component/prompt/autocomplete.tsx
+++ b/packages/opencode/src/cli/cmd/tui/component/prompt/autocomplete.tsx
@@ -553,11 +553,10 @@ export function Autocomplete(props: {
 
   const commands = createMemo((): AutocompleteOption[] => {
     const results: AutocompleteOption[] = slashes().map((command) => {
-      const name = command.display.trim().slice(1)
-      if (name !== "compact") return command
+      if (!command.input) return command
       return {
         ...command,
-        onSelect: () => insertSlashCommand(name),
+        onSelect: () => insertSlashCommand(command.name),
       }
     })
 
diff --git a/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx b/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx
index 9764439ec0..05caf1482b 100644
--- a/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx
+++ b/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx
@@ -1132,6 +1132,8 @@ export function Prompt(props: PromptProps) {
           ]
         : []
 
+    const slash = parseSlashCommand(inputText)
+
     if (store.mode === "shell") {
       void sdk.client.session.shell({
         sessionID,
@@ -1143,34 +1145,20 @@ export function Prompt(props: PromptProps) {
         command: inputText,
       })
       setStore("mode", "normal")
-    } else if (isCompactSlash(inputText)) {
-      const instructions = slashArguments(inputText).trim()
-      const payload: Parameters<typeof sdk.client.session.summarize>[0] & { $body_instructions?: string } = {
+    } else if (slash && (slash.name === "compact" || slash.name === "summarize")) {
+      const instructions = slash.arguments.trim()
+      const payload = {
         sessionID,
         modelID: selectedModel.modelID,
         providerID: selectedModel.providerID,
         ...(instructions ? { $body_instructions: instructions } : {}),
-      }
+      } satisfies Parameters<typeof sdk.client.session.summarize>[0] & { $body_instructions?: string }
       void sdk.client.session.summarize(payload)
-    } else if (
-      inputText.startsWith("/") &&
-      iife(() => {
-        const firstLine = inputText.split("\n")[0]
-        const command = firstLine.split(" ")[0].slice(1)
-        return sync.data.command.some((x) => x.name === command)
-      })
-    ) {
-      // Parse command from first line, preserve multi-line content in arguments
-      const firstLineEnd = inputText.indexOf("\n")
-      const firstLine = firstLineEnd === -1 ? inputText : inputText.slice(0, firstLineEnd)
-      const [command, ...firstLineArgs] = firstLine.split(" ")
-      const restOfInput = firstLineEnd === -1 ? "" : inputText.slice(firstLineEnd + 1)
-      const args = firstLineArgs.join(" ") + (restOfInput ? "\n" + restOfInput : "")
-
+    } else if (slash && sync.data.command.some((x) => x.name === slash.name)) {
       void sdk.client.session.command({
         sessionID,
-        command: command.slice(1),
-        arguments: args,
+        command: slash.name,
+        arguments: slash.arguments,
         agent: agent.name,
         model: `${selectedModel.providerID}/${selectedModel.modelID}`,
         messageID,
@@ -1230,17 +1218,16 @@ export function Prompt(props: PromptProps) {
     return true
   }
 
-  function isCompactSlash(text: string) {
-    const command = text.split("\n")[0].split(" ")[0].slice(1)
-    return text.startsWith("/") && (command === "compact" || command === "summarize")
-  }
-
-  function slashArguments(text: string) {
+  function parseSlashCommand(text: string) {
+    if (!text.startsWith("/")) return
     const firstLineEnd = text.indexOf("\n")
     const firstLine = firstLineEnd === -1 ? text : text.slice(0, firstLineEnd)
-    const [, ...firstLineArgs] = firstLine.split(" ")
+    const [command, ...firstLineArgs] = firstLine.split(" ")
     const restOfInput = firstLineEnd === -1 ? "" : text.slice(firstLineEnd + 1)
-    return firstLineArgs.join(" ") + (restOfInput ? "\n" + restOfInput : "")
+    return {
+      name: command.slice(1),
+      arguments: firstLineArgs.join(" ") + (restOfInput ? "\n" + restOfInput : ""),
+    }
   }
   const exit = useExit()
 
diff --git a/packages/opencode/src/cli/cmd/tui/keymap.tsx b/packages/opencode/src/cli/cmd/tui/keymap.tsx
index d8489fd2f7..eea0ff74cb 100644
--- a/packages/opencode/src/cli/cmd/tui/keymap.tsx
+++ b/packages/opencode/src/cli/cmd/tui/keymap.tsx
@@ -25,9 +25,11 @@ export { useBindings, useKeymapSelector }
 export type OpenTuiKeymap = ReturnType<typeof useKeymap>
 type OpencodeModeStack = ReturnType<typeof createOpencodeModeStack>
 type CommandSlashEntry = {
+  name: string
   display: string
   description?: string
   aliases?: string[]
+  input?: boolean
   onSelect: () => void
 }
 type Command = ReturnType<OpenTuiKeymap["getCommands"]>[number]
@@ -256,6 +258,7 @@ export function useCommandSlashes(): Accessor<readonly CommandSlashEntry[]> {
       if (typeof slashName !== "string" || !slashName) return []
       const slashAliases = entry.command.slashAliases
       return {
+        name: slashName,
         display: `/${slashName}`,
         description:
           typeof entry.command.desc === "string"
@@ -266,6 +269,7 @@ export function useCommandSlashes(): Accessor<readonly CommandSlashEntry[]> {
         aliases: Array.isArray(slashAliases)
           ? slashAliases.filter((alias): alias is string => typeof alias === "string").map((alias) => `/${alias}`)
           : undefined,
+        input: entry.command.slashInput === true,
         onSelect: () => keymap.dispatchCommand(entry.command.name),
       }
     }),
diff --git a/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx b/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx
index 245a7296b5..857e9c0868 100644
--- a/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx
+++ b/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx
@@ -546,6 +546,7 @@ export function Session() {
       slash: {
         name: "compact",
         aliases: ["summarize"],
+        input: true,
       },
       run: () => {
         const selectedModel = local.model.current()
@@ -1046,6 +1047,7 @@ export function Session() {
       desc: "description" in command ? command.description : undefined,
       slashName: "slash" in command ? command.slash?.name : undefined,
       slashAliases: "slash" in command ? command.slash?.aliases : undefined,
+      slashInput: "slash" in command ? command.slash?.input : undefined,
       ...command,
     })),
   )