diff --git a/docs/conventions/hook-telemetry/README.md b/docs/conventions/hook-telemetry/README.md
index 02b3575f9..01af5009d 100644
--- a/docs/conventions/hook-telemetry/README.md
+++ b/docs/conventions/hook-telemetry/README.md
@@ -154,6 +154,7 @@ producers without coordinating with them or each other.
 |----------|--------------|-------------|
 | `markdown-format` plugin | `markdown-format` | `data/markdown-format.schema.json` |
 | `typos-format` plugin | `typos-format` | `data/typos-format.schema.json` |
+| `ruff-format` plugin | `ruff-format` | `data/ruff-format.schema.json` |
 | `bash-format` plugin | `bash-format` | `data/bash-format.schema.json` |
 | `desktop-notification` plugin | `desktop-notification` | `data/desktop-notification.schema.json` |
 | `guardrails` plugin | `secret-pattern-detection` | `data/secret-pattern-detection.schema.json` |
diff --git a/docs/conventions/hook-telemetry/data/ruff-format.schema.json b/docs/conventions/hook-telemetry/data/ruff-format.schema.json
new file mode 100644
index 000000000..eb462b601
--- /dev/null
+++ b/docs/conventions/hook-telemetry/data/ruff-format.schema.json
@@ -0,0 +1,24 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://raw.githubusercontent.com/melodic-software/claude-code-plugins/main/docs/conventions/hook-telemetry/data/ruff-format.schema.json",
+  "title": "ruff-format telemetry data",
+  "description": "Per-hook `data` payload for the ruff-format hook. Discovered from the envelope `hook` value \"ruff-format\". Evolves additive-only.",
+  "type": "object",
+  "required": ["tool", "file", "findings"],
+  "additionalProperties": true,
+  "properties": {
+    "tool": {
+      "type": "string",
+      "description": "Claude Code tool that triggered the hook (Write or Edit)."
+    },
+    "file": {
+      "type": "string",
+      "description": "Path of the formatted Python file, relative to the consuming repo root."
+    },
+    "findings": {
+      "type": "array",
+      "items": { "type": "string" },
+      "description": "Residual Ruff diagnostics remaining after check --fix and format, one concise line per diagnostic. Empty array = clean."
+    }
+  }
+}
diff --git a/plugins/ruff-format/.claude-plugin/plugin.json b/plugins/ruff-format/.claude-plugin/plugin.json
index 29a8fea90..d6cce7c54 100644
--- a/plugins/ruff-format/.claude-plugin/plugin.json
+++ b/plugins/ruff-format/.claude-plugin/plugin.json
@@ -1,7 +1,7 @@
 {
   "$schema": "https://json.schemastore.org/claude-code-plugin-manifest.json",
   "name": "ruff-format",
-  "version": "0.4.2",
+  "version": "0.4.3",
   "description": "Auto-format and lint Python on edit via Ruff, only when a Ruff config governs the repo — using the consuming repo's own Ruff config.",
   "author": {
     "name": "Melodic Software",
diff --git a/plugins/ruff-format/CHANGELOG.md b/plugins/ruff-format/CHANGELOG.md
index 404e24c8e..87b70b890 100644
--- a/plugins/ruff-format/CHANGELOG.md
+++ b/plugins/ruff-format/CHANGELOG.md
@@ -3,6 +3,16 @@
 All notable changes to the `ruff-format` plugin are documented here. Format follows
 [Keep a Changelog](https://keepachangelog.com/en/1.1.0/); this plugin uses semantic versioning.
 
+## [0.4.3]
+
+### Fixed
+
+- Published `data/ruff-format.schema.json` in the hook-telemetry convention and
+  registered `ruff-format` in its Implementers table, closing the gap where the
+  hook's `hook::emit_telemetry("ruff-format", ...)` envelope had no per-hook
+  `data` schema for a consuming sink to validate against — unlike the sibling
+  `markdown-format` and `typos-format` producers. No hook behavior change.
+
 ## [0.4.2]
 
 ### Changed