diff --git a/renderer.lua b/renderer.lua
index 1ee776c..cd21d7d 100644
--- a/renderer.lua
+++ b/renderer.lua
@@ -76,4 +76,35 @@ function M.assistant_flush()
     stream_buf = nil
 end
 
+-- Phase 2: MCP tool-call frame. Visual parity with the exec_begin/exec_end
+-- frame so the user reads tool dispatch and shell dispatch the same way.
+-- tool_call_begin renders the top rule + (optionally) the args as a dim
+-- preview; tool_call_end renders the result content followed by a status
+-- rule. Status is "ok" (dim) by default; "error" (red) if is_error is true.
+-- See docs/PHASE2.md §3 renderer.lua row + §4 Tool invocation.
+
+function M.tool_call_begin(name, args)
+    emit(A.dim, "─── tool: ", A.reset,
+         A.cyan, name, A.reset,
+         A.dim, " ───", A.reset, "\n")
+    if args and args ~= "" and args ~= "{}" then
+        local shown = (#args <= 200) and args or (args:sub(1, 197) .. "...")
+        emit(A.dim, shown, A.reset, "\n")
+    end
+end
+
+function M.tool_call_end(content, is_error)
+    if content and content ~= "" then
+        emit(content)
+        if not content:match("\n$") then emit("\n") end
+    end
+    if is_error then
+        emit(A.dim, "─── ", A.reset,
+             A.red, "error", A.reset,
+             A.dim, " ───", A.reset, "\n")
+    else
+        emit(A.dim, "─── ok ───", A.reset, "\n")
+    end
+end
+
 return M