separate event for providing tool details

OpenAI and Anthropic have tool details (id, name) converge on different
timelines. In all cases they are available in `onBlockComplete` which
comes with the full block, and previously we had an optional `BlockMeta`
argument to `onBlockStart` - the anthropic timeline.

We removed the `BlockMeta` from `onBlockStart` since it was always going
to be unreliable, and now have an explicit `onToolDetails` instead. This
allows us to provide the tool id and name as early as possible from the
openai provider (could be in the middle of content deltas), and provide
a reliable signal across providers.

Also, fix test output.

1 files changed, 26 insertions, 0 deletions

diff --git a/src/main.zig b/src/main.zig
index c1212e8..15b2dd2 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -10,6 +10,15 @@ const extension_loader = @import("extension_loader.zig");
 const lua = lua_bridge.c;
 
 test {
+    // Test contract: deliberate error-path tests should not produce visible
+    // log output. Code logs at `.err` for genuine production failures and
+    // `.warn` for expected-failure paths exercised by tests; the test
+    // runner's logger gates on `std.testing.log_level`, which defaults to
+    // `.warn`. Raising it to `.err` silences expected warnings without
+    // changing production behavior. Anything that *should* be visible in a
+    // passing test must use `std.debug.print` or assert via the testing API.
+    std.testing.log_level = .err;
+
     std.testing.refAllDecls(@This());
     _ = lua_bridge;
     _ = lua_runtime;
@@ -34,12 +43,29 @@ const CLIReceiver = struct {
     const vtable: ReceiverVTable = .{
         .onMessageStart = onMessageStart,
         .onBlockStart = onBlockStart,
+        .onToolDetails = onToolDetails,
         .onContentDelta = onContentDelta,
         .onBlockComplete = onBlockComplete,
         .onMessageComplete = onMessageComplete,
         .onError = onError,
     };
 
+    /// The print-based CLI defers tool-name rendering to onBlockComplete
+    /// to avoid cursor gymnastics (we can't go back and edit the prefix).
+    /// Receivers backed by a TUI capable of in-place updates would render
+    /// the name as soon as it's known here.
+    fn onToolDetails(
+        ptr: *anyopaque,
+        index: usize,
+        id: []const u8,
+        name: []const u8,
+    ) anyerror!void {
+        _ = ptr;
+        _ = index;
+        _ = id;
+        _ = name;
+    }
+
     fn onMessageStart(ptr: *anyopaque, role: MessageRole) anyerror!void {
         _ = ptr;
         _ = role;