diff --git a/rtk/SYMPOSIUM.toml b/rtk/SYMPOSIUM.toml
new file mode 100644
index 0000000..a724bbd
--- /dev/null
+++ b/rtk/SYMPOSIUM.toml
@@ -0,0 +1,20 @@
+name = "rtk"
+depends-on = ["*"]
+
+# Install the RTK binary from its canonical git repository. RTK is not
+# installed from crates.io because another crate uses the same name there.
+[[installations]]
+name = "rtk"
+source = "cargo"
+crate = "rtk"
+git = "https://github.com/rtk-ai/rtk"
+executable = "rtk"
+
+# RTK's native Claude hook reads and writes Claude's PreToolUse wire format.
+[[hooks]]
+name = "rewrite"
+event = "PreToolUse"
+matcher = "Bash"
+format = "claude"
+command = "rtk"
+args = ["hook", "claude"]
diff --git a/rtk/rtk.toml b/rtk/rtk.toml
deleted file mode 100644
index 55acdbd..0000000
--- a/rtk/rtk.toml
+++ /dev/null
@@ -1,20 +0,0 @@
-name = "rtk"
-crates = []
-
-# Installs the `rtk` binary via cargo from the rtk-ai/rtk git repo.
-[[installations]]
-name = "rtk"
-source = "cargo"
-crate = "rtk"
-git = "https://github.com/rtk-ai/rtk"
-executable = "rtk"
-
-# Pre-tool-use hook: pulls the rtk-rewrite script from the same repo and runs
-# it via `sh`. The `rtk` requirement ensures the binary is on disk first.
-[[hooks]]
-name = "rewrite"
-event = "PreToolUse"
-matcher = "Bash"
-agent = "claude"
-requirements = ["rtk"]
-command = { source = "github", url = "https://github.com/rtk-ai/rtk", script = "hooks/claude/rtk-rewrite.sh" }