diff --git a/deployments/compose/process-compose-dev-tooling.yml b/deployments/compose/process-compose-dev-tooling.yml
new file mode 100644
index 0000000000..a68a29cfea
--- /dev/null
+++ b/deployments/compose/process-compose-dev-tooling.yml
@@ -0,0 +1,25 @@
+---
+# A process-compose configuration for running a dev-centric debugging and introspection
+# tooling for Penumbra, such as gRPC UI, for exploring protobuf interfaces.
+version: "0.5"
+log_level: info
+is_strict: true
+
+processes:
+  # Run gRPC UI for interactive protobuf exploration in a web UI: http://localhost:8100
+  grpcui:
+    command: grpcui -v -open-browser=false -port 8100 -plaintext localhost:8080
+    readiness_probe:
+      http_get:
+        host: 127.0.0.1
+        scheme: http
+        path: "/"
+        port: 8100
+      initial_delay_seconds: 10
+      period_seconds: 5
+      failure_threshold: 3
+    availability:
+      restart: exit_on_failure
+    depends_on:
+      pd:
+        condition: process_healthy
diff --git a/flake.nix b/flake.nix
index b9a2628ed1..dc1b7ee299 100644
--- a/flake.nix
+++ b/flake.nix
@@ -31,6 +31,17 @@
             vendorHash = "sha256-0iqI/Z8rqDyQ7JqSrsqA9kADqF6qZy8NxTDNjAYYHts=";
           };
 
+          # Build grpcui from source, for Reflection v1 support.
+          # https://github.com/fullstorydev/grpcui/issues/322
+          # To update the grpcui hash values, run:
+          # nix-prefetch-git --url https://github.com/fullstorydev/grpcui --rev 483f037ec98b89200353c696d990324318f8df98
+          grpcUiRelease = {
+            version = "1.4.2-pre.1";
+            sha256 = "sha256-3vjJNa1bXoMGZXPRyVqhxYZPX5FDp8Efy+w6gdx0pXE=";
+            vendorHash = "sha256-j7ZJeO9vhjOoR8aOOJymDM6D7mPAJQoD4O6AyAsErRY=";
+            rev = "483f037ec98b89200353c696d990324318f8df98";
+          };
+
           # Set up for Rust builds, pinned to the Rust toolchain version in the Penumbra repository
           overlays = [ (import rust-overlay) ];
           pkgs = import nixpkgs { inherit system overlays; };
@@ -91,6 +102,25 @@
               license = licenses.asl20;
             };
           }).overrideAttrs (_: { doCheck = false; }); # Disable tests to improve build times
+
+          # grpcui
+          grpcui = (buildGoModule rec {
+            pname = "grpcui";
+            version = grpcUiRelease.version;
+            subPackages = [ "cmd/grpcui" ];
+            src = fetchFromGitHub {
+              owner = "fullstorydev";
+              repo = "grpcui";
+              rev = "${grpcUiRelease.rev}";
+              hash = grpcUiRelease.sha256;
+            };
+            vendorHash = grpcUiRelease.vendorHash;
+            meta = {
+              description = "An interactive web UI for gRPC, along the lines of postman";
+              homepage = "https://github.com/fullstorydev/grpcui";
+              license = licenses.mit;
+            };
+          }).overrideAttrs (_: { doCheck = false; }); # Disable tests to improve build times
         in rec {
           packages = { inherit penumbra cometbft; };
           apps = {
@@ -117,6 +147,7 @@
               cometbft
               grafana
               grpcurl
+              grpcui
               just
               mdbook
               mdbook-katex
diff --git a/justfile b/justfile
index 818449c776..e11ac43fdf 100644
--- a/justfile
+++ b/justfile
@@ -8,7 +8,8 @@ dev:
     ./deployments/scripts/check-nix-shell && \
         ./deployments/scripts/run-local-devnet.sh \
         --config ./deployments/compose/process-compose-postgres.yml \
-        --config ./deployments/compose/process-compose-metrics.yml
+        --config ./deployments/compose/process-compose-metrics.yml \
+        --config ./deployments/compose/process-compose-dev-tooling.yml
 
 # Formats the rust files in the project.
 fmt: