diff --git a/.claude-plugin/marketplace.json b/.claude-plugin/marketplace.json
index 3105a40..4184a39 100644
--- a/.claude-plugin/marketplace.json
+++ b/.claude-plugin/marketplace.json
@@ -12,6 +12,11 @@
       "name": "obsidian-agent",
       "source": { "source": "github", "repo": "cavi-ai/obsidian-agent" },
       "description": "Portable Obsidian vault workflows powered by the official Obsidian CLI."
+    },
+    {
+      "name": "loop-killer",
+      "source": { "source": "github", "repo": "cavi-ai/loop-killer" },
+      "description": "Ends a stop-hook re-prompt loop: after repeated re-prompt turns with no tool work, it clears the active goal and says so."
     }
   ]
 }
diff --git a/README.md b/README.md
index f1b6b69..494d8ee 100644
--- a/README.md
+++ b/README.md
@@ -8,17 +8,19 @@
 | --- | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
 | [`mlx-agent`](https://github.com/cavi-ai/mlx-agent) — discover, verify, and wire local MLX models | ✓ | ✓ | — | ✓ | ✓ | ✓ | ✓ |
 | [`obsidian-agent`](https://github.com/cavi-ai/obsidian-agent) — portable vault workflows over the official Obsidian CLI | ✓ | ✓ | ✓ | ✓ | — | — | ✓ |
+| [`loop-killer`](https://github.com/cavi-ai/loop-killer) — end stop-hook re-prompt loops by clearing the active goal | ✓ | — | — | — | — | — | — |
 
 The machine-readable source of truth is [`catalog.json`](catalog.json). Claude and Codex consume native marketplace projections. Gemini, OpenCode, OpenClaw, and Hermes use the discovery records under `providers/`, which link to each source repository's tested installer; those files do not claim a native marketplace protocol. Portable AgentSkills packages remain available from each plugin repository.
 
 ## Claude Code
 
-Add the marketplace, then install either plugin:
+Add the marketplace, then install a plugin:
 
 ```text
 /plugin marketplace add cavi-ai/plugins
 /plugin install mlx-agent@cavi-ai
 /plugin install obsidian-agent@cavi-ai
+/plugin install loop-killer@cavi-ai
 ```
 
 ## Codex
diff --git a/catalog.json b/catalog.json
index aab0469..1cba0b1 100644
--- a/catalog.json
+++ b/catalog.json
@@ -30,6 +30,16 @@
         "opencode": { "path": "providers/opencode" },
         "agentskills": { "path": "providers/agentskills" }
       }
+    },
+    {
+      "name": "loop-killer",
+      "repository": "cavi-ai/loop-killer",
+      "license": "MIT",
+      "summary": "End stop-hook re-prompt loops by clearing the active goal.",
+      "hosts": ["claude"],
+      "packages": {
+        "claude": { "path": "." }
+      }
     }
   ]
 }
diff --git a/catalog.schema.json b/catalog.schema.json
index 9dc432c..017488b 100644
--- a/catalog.schema.json
+++ b/catalog.schema.json
@@ -10,8 +10,7 @@
     "name": { "const": "cavi-ai" },
     "plugins": {
       "type": "array",
-      "minItems": 2,
-      "maxItems": 2,
+      "minItems": 1,
       "items": { "$ref": "#/$defs/plugin" }
     }
   },
@@ -28,7 +27,7 @@
       "additionalProperties": false,
       "required": ["name", "repository", "license", "summary", "hosts", "packages"],
       "properties": {
-        "name": { "enum": ["mlx-agent", "obsidian-agent"] },
+        "name": { "enum": ["mlx-agent", "obsidian-agent", "loop-killer"] },
         "repository": { "type": "string", "pattern": "^cavi-ai/[a-z0-9-]+$" },
         "license": { "type": "string", "minLength": 1 },
         "summary": { "type": "string", "minLength": 1 },
diff --git a/scripts/validate-catalog.mjs b/scripts/validate-catalog.mjs
index 38c9aa1..616dda3 100644
--- a/scripts/validate-catalog.mjs
+++ b/scripts/validate-catalog.mjs
@@ -7,6 +7,8 @@ import { fileURLToPath } from "node:url";
 export const HOSTS = ["claude", "codex", "gemini", "opencode", "openclaw", "hermes", "agentskills"];
 // Marketplace identity: what users type after @ in `plugin install <name>@<marketplace>`.
 export const MARKETPLACE = "cavi-ai";
+// Every plugin the catalog may list. REQUIRED is the subset that must be present and ships a pinned Codex package.
+const CANONICAL = ["mlx-agent", "obsidian-agent", "loop-killer"];
 const REQUIRED = ["mlx-agent", "obsidian-agent"];
 const INCLUDED_ROOTS = [".codex-plugin", "skills"];
 const SKILL_INVENTORIES = {
@@ -92,7 +94,7 @@ function unknownKeys(value, allowed) {
 }
 
 function validateCanonicalSchema(schema, catalog, errors) {
-  if (schema?.$schema !== "https://json-schema.org/draft/2020-12/schema" || schema?.$id !== "https://github.com/cavi-ai/plugins/catalog.schema.json" || schema?.type !== "object" || schema?.additionalProperties !== false || schema?.properties?.name?.const !== MARKETPLACE || schema?.properties?.plugins?.minItems !== 2 || schema?.properties?.plugins?.maxItems !== 2 || schema?.$defs?.plugin?.additionalProperties !== false || JSON.stringify(schema?.$defs?.host?.enum) !== JSON.stringify(HOSTS)) errors.push("catalog schema contract invalid");
+  if (schema?.$schema !== "https://json-schema.org/draft/2020-12/schema" || schema?.$id !== "https://github.com/cavi-ai/plugins/catalog.schema.json" || schema?.type !== "object" || schema?.additionalProperties !== false || schema?.properties?.name?.const !== MARKETPLACE || schema?.properties?.plugins?.minItems !== 1 || schema?.properties?.plugins?.maxItems !== undefined || JSON.stringify(schema?.$defs?.plugin?.properties?.name?.enum) !== JSON.stringify(CANONICAL) || schema?.$defs?.plugin?.additionalProperties !== false || JSON.stringify(schema?.$defs?.host?.enum) !== JSON.stringify(HOSTS)) errors.push("catalog schema contract invalid");
   const violation = (location, message) => errors.push(`catalog schema violation: ${location} ${message}`);
   if (!catalog || typeof catalog !== "object" || Array.isArray(catalog)) { violation("root", "must be an object"); return; }
   if (catalog.$schema !== "./catalog.schema.json") errors.push("catalog schema reference invalid");
@@ -102,13 +104,13 @@ function validateCanonicalSchema(schema, catalog, errors) {
   else if (catalog.name !== MARKETPLACE) violation("name", `must equal ${MARKETPLACE}`);
   if (!Object.hasOwn(catalog, "plugins")) violation("plugins", "is required");
   else if (!Array.isArray(catalog.plugins)) violation("plugins", "must be an array");
-  else if (catalog.plugins.length !== 2) violation("plugins", "must contain exactly 2 items");
+  else if (catalog.plugins.length < 1) violation("plugins", "must contain at least 1 item");
   for (const [index, plugin] of (Array.isArray(catalog.plugins) ? catalog.plugins : []).entries()) {
     const location = `plugins[${index}]`;
     if (!plugin || typeof plugin !== "object" || Array.isArray(plugin)) { violation(location, "must be an object"); continue; }
     for (const key of unknownKeys(plugin, ["name", "repository", "license", "summary", "hosts", "packages"])) errors.push(`catalog plugin ${plugin?.name} unknown property: ${key}`);
     for (const key of ["name", "repository", "license", "summary", "hosts", "packages"]) if (!Object.hasOwn(plugin, key)) violation(`${location}.${key}`, "is required");
-    if (Object.hasOwn(plugin, "name") && !REQUIRED.includes(plugin.name)) violation(`${location}.name`, "must be a canonical plugin name");
+    if (Object.hasOwn(plugin, "name") && !CANONICAL.includes(plugin.name)) violation(`${location}.name`, "must be a canonical plugin name");
     if (Object.hasOwn(plugin, "repository") && (typeof plugin.repository !== "string" || !/^cavi-ai\/[a-z0-9-]+$/.test(plugin.repository))) violation(`${location}.repository`, "must match ^cavi-ai/[a-z0-9-]+$");
     for (const key of ["license", "summary"]) if (Object.hasOwn(plugin, key) && (typeof plugin[key] !== "string" || plugin[key].length < 1)) violation(`${location}.${key}`, "must be a non-empty string");
     if (Object.hasOwn(plugin, "hosts")) {
@@ -278,7 +280,7 @@ export async function validateCatalog(root = process.cwd()) {
     }
   }
   for (const name of REQUIRED) if (!byName.has(name)) errors.push(`required plugin missing: ${name}`);
-  for (const name of byName.keys()) if (!REQUIRED.includes(name)) errors.push(`unexpected plugin: ${name}`);
+  for (const name of byName.keys()) if (!CANONICAL.includes(name)) errors.push(`unexpected plugin: ${name}`);
 
   for (const [host, relative] of Object.entries(PROJECTIONS)) {
     const projection = await json(root, relative, errors);
diff --git a/scripts/validate-catalog.test.mjs b/scripts/validate-catalog.test.mjs
index c7387ca..5f9447c 100644
--- a/scripts/validate-catalog.test.mjs
+++ b/scripts/validate-catalog.test.mjs
@@ -89,7 +89,7 @@ const entry = (name, host) => ({
   ...(host === "openclaw" || host === "hermes" ? { install: { command: `git clone https://github.com/cavi-ai/mlx-agent.git && python3 mlx-agent/scripts/mlx-agent install ${host} --scope user --dry-run --json` } } : {})
 });
 
-test("accepts exactly the two canonical plugins and truthful host projections", async () => {
+test("accepts the canonical plugins and truthful host projections", async () => {
   const root = await fixture({
     catalog: canonical,
     claude: [entry("mlx-agent", "claude"), entry("obsidian-agent", "claude")],
@@ -102,6 +102,35 @@ test("accepts exactly the two canonical plugins and truthful host projections",
   assert.deepEqual(await validateCatalog(root), []);
 });
 
+test("accepts a claude-only plugin projected only to claude", async () => {
+  const withLoopKiller = { ...canonical, plugins: [...canonical.plugins, plugin("loop-killer", "cavi-ai/loop-killer", ["claude"])] };
+  const loopKiller = { name: "loop-killer", repository: "cavi-ai/loop-killer", package: "." };
+  const projections = {
+    gemini: [entry("obsidian-agent", "gemini")],
+    opencode: [entry("mlx-agent", "opencode"), entry("obsidian-agent", "opencode")],
+    openclaw: [entry("mlx-agent", "openclaw")],
+    hermes: [entry("mlx-agent", "hermes")]
+  };
+  const root = await fixture({
+    catalog: withLoopKiller,
+    claude: [entry("mlx-agent", "claude"), entry("obsidian-agent", "claude"), loopKiller],
+    codex: [entry("mlx-agent", "codex"), entry("obsidian-agent", "codex")],
+    ...projections
+  });
+  assert.deepEqual(await validateCatalog(root), []);
+  const projectedWide = await fixture({
+    catalog: withLoopKiller,
+    claude: [entry("mlx-agent", "claude"), entry("obsidian-agent", "claude"), loopKiller],
+    codex: [entry("mlx-agent", "codex"), entry("obsidian-agent", "codex")],
+    ...projections,
+    opencode: [...projections.opencode, { ...loopKiller, install: { command: "git clone https://github.com/cavi-ai/loop-killer.git" } }]
+  });
+  const errors = await validateCatalog(projectedWide);
+  assert(errors.some((error) => error.includes("opencode projects unsupported plugin host: loop-killer")));
+  const unprojected = await validateCatalog(await fixture({ catalog: withLoopKiller, claude: [entry("mlx-agent", "claude"), entry("obsidian-agent", "claude")], codex: [entry("mlx-agent", "codex"), entry("obsidian-agent", "codex")], ...projections }));
+  assert(unprojected.includes("claude projection missing: loop-killer"));
+});
+
 test("requires openclaw and hermes discovery records only for plugins that declare them", async () => {
   const root = await fixture({
     catalog: canonical,