diff --git a/src/app/api/cli-tools/claude-settings/route.js b/src/app/api/cli-tools/claude-settings/route.js
index 121879dad7..bb5fa06fc4 100644
--- a/src/app/api/cli-tools/claude-settings/route.js
+++ b/src/app/api/cli-tools/claude-settings/route.js
@@ -41,12 +41,12 @@ const readSettings = async () => {
   try {
     const settingsPath = getClaudeSettingsPath();
     const content = await fs.readFile(settingsPath, "utf-8");
-    return JSON.parse(content);
+    // Tolerate JSONC (trailing commas) and treat unparseable files as "no config"
+    // rather than throwing a 500 that the UI misreads as "tool not installed".
+    const stripped = content.replace(/,(\s*[}\]])/g, "$1");
+    return JSON.parse(stripped);
   } catch (error) {
-    if (error.code === "ENOENT") {
-      return null;
-    }
-    throw error;
+    return null;
   }
 };
 
diff --git a/src/app/api/cli-tools/cline-settings/route.js b/src/app/api/cli-tools/cline-settings/route.js
index cc72397932..ecbccbd250 100644
--- a/src/app/api/cli-tools/cline-settings/route.js
+++ b/src/app/api/cli-tools/cline-settings/route.js
@@ -35,10 +35,12 @@ const checkInstalled = async () => {
 const readJson = async (filePath) => {
   try {
     const content = await fs.readFile(filePath, "utf-8");
-    return JSON.parse(content);
+    // Tolerate JSONC (trailing commas) and treat unparseable files as "no config"
+    // rather than throwing a 500 that the UI misreads as "tool not installed".
+    const stripped = content.replace(/,(\s*[}\]])/g, "$1");
+    return JSON.parse(stripped);
   } catch (error) {
-    if (error.code === "ENOENT") return null;
-    throw error;
+    return null;
   }
 };
 
diff --git a/src/app/api/cli-tools/copilot-settings/route.js b/src/app/api/cli-tools/copilot-settings/route.js
index 449c6e2c0a..3c0bd6699a 100644
--- a/src/app/api/cli-tools/copilot-settings/route.js
+++ b/src/app/api/cli-tools/copilot-settings/route.js
@@ -21,10 +21,12 @@ const getConfigPath = () => {
 const readConfig = async () => {
   try {
     const content = await fs.readFile(getConfigPath(), "utf-8");
-    return JSON.parse(content);
+    // Tolerate JSONC (trailing commas) and treat unparseable files as "no config"
+    // rather than throwing a 500 that the UI misreads as "tool not installed".
+    const stripped = content.replace(/,(\s*[}\]])/g, "$1");
+    return JSON.parse(stripped);
   } catch (error) {
-    if (error.code === "ENOENT") return null;
-    throw error;
+    return null;
   }
 };
 
diff --git a/src/app/api/cli-tools/cowork-settings/route.js b/src/app/api/cli-tools/cowork-settings/route.js
index e09ec28306..d30b667e33 100644
--- a/src/app/api/cli-tools/cowork-settings/route.js
+++ b/src/app/api/cli-tools/cowork-settings/route.js
@@ -116,10 +116,14 @@ const get1pRoot = () => {
 const get1pConfigPath = () => path.join(get1pRoot(), "claude_desktop_config.json");
 
 const read1pConfig = async () => {
-  try { return JSON.parse(await fs.readFile(get1pConfigPath(), "utf-8")) || {}; }
-  catch (error) {
-    if (error.code === "ENOENT") return {};
-    throw error;
+  try {
+    const content = await fs.readFile(get1pConfigPath(), "utf-8");
+    // Tolerate JSONC (trailing commas) and treat unparseable files as empty config
+    // rather than throwing a 500 that the UI misreads as "tool not installed".
+    const stripped = content.replace(/,(\s*[}\]])/g, "$1");
+    return JSON.parse(stripped) || {};
+  } catch (error) {
+    return {};
   }
 };
 
@@ -193,10 +197,14 @@ const checkInstalled = async () => {
 };
 
 const readJson = async (filePath) => {
-  try { return JSON.parse(await fs.readFile(filePath, "utf-8")); }
-  catch (error) {
-    if (error.code === "ENOENT") return null;
-    throw error;
+  try {
+    const content = await fs.readFile(filePath, "utf-8");
+    // Tolerate JSONC (trailing commas) and treat unparseable files as "no config"
+    // rather than throwing a 500 that the UI misreads as "tool not installed".
+    const stripped = content.replace(/,(\s*[}\]])/g, "$1");
+    return JSON.parse(stripped);
+  } catch (error) {
+    return null;
   }
 };
 
diff --git a/src/app/api/cli-tools/droid-settings/route.js b/src/app/api/cli-tools/droid-settings/route.js
index 34f5326258..a4162578d4 100644
--- a/src/app/api/cli-tools/droid-settings/route.js
+++ b/src/app/api/cli-tools/droid-settings/route.js
@@ -37,10 +37,12 @@ const readSettings = async () => {
   try {
     const settingsPath = getDroidSettingsPath();
     const content = await fs.readFile(settingsPath, "utf-8");
-    return JSON.parse(content);
+    // Tolerate JSONC (trailing commas) and treat unparseable files as "no config"
+    // rather than throwing a 500 that the UI misreads as "tool not installed".
+    const stripped = content.replace(/,(\s*[}\]])/g, "$1");
+    return JSON.parse(stripped);
   } catch (error) {
-    if (error.code === "ENOENT") return null;
-    throw error;
+    return null;
   }
 };
 
diff --git a/src/app/api/cli-tools/kilo-settings/route.js b/src/app/api/cli-tools/kilo-settings/route.js
index 6802adc8db..9c5993f2c2 100644
--- a/src/app/api/cli-tools/kilo-settings/route.js
+++ b/src/app/api/cli-tools/kilo-settings/route.js
@@ -35,10 +35,12 @@ const checkInstalled = async () => {
 const readJson = async (filePath) => {
   try {
     const content = await fs.readFile(filePath, "utf-8");
-    return JSON.parse(content);
+    // Tolerate JSONC (trailing commas) and treat unparseable files as "no config"
+    // rather than throwing a 500 that the UI misreads as "tool not installed".
+    const stripped = content.replace(/,(\s*[}\]])/g, "$1");
+    return JSON.parse(stripped);
   } catch (error) {
-    if (error.code === "ENOENT") return null;
-    throw error;
+    return null;
   }
 };
 
diff --git a/src/app/api/cli-tools/openclaw-settings/route.js b/src/app/api/cli-tools/openclaw-settings/route.js
index 85af6a92c2..2047a256c3 100644
--- a/src/app/api/cli-tools/openclaw-settings/route.js
+++ b/src/app/api/cli-tools/openclaw-settings/route.js
@@ -47,10 +47,12 @@ const readSettings = async () => {
   try {
     const settingsPath = getOpenClawSettingsPath();
     const content = await fs.readFile(settingsPath, "utf-8");
-    return JSON.parse(content);
+    // Tolerate JSONC (trailing commas) and treat unparseable files as "no config"
+    // rather than throwing a 500 that the UI misreads as "tool not installed".
+    const stripped = content.replace(/,(\s*[}\]])/g, "$1");
+    return JSON.parse(stripped);
   } catch (error) {
-    if (error.code === "ENOENT") return null;
-    throw error;
+    return null;
   }
 };
 
diff --git a/src/app/api/cli-tools/opencode-settings/route.js b/src/app/api/cli-tools/opencode-settings/route.js
index f4429cf5e9..03819c6619 100644
--- a/src/app/api/cli-tools/opencode-settings/route.js
+++ b/src/app/api/cli-tools/opencode-settings/route.js
@@ -35,10 +35,16 @@ const checkOpenCodeInstalled = async () => {
 const readConfig = async () => {
   try {
     const content = await fs.readFile(getConfigPath(), "utf-8");
-    return JSON.parse(content);
+    // opencode config files may use JSONC format (trailing commas, comments).
+    // Strip trailing commas before parsing to avoid SyntaxError on valid JSONC.
+    const stripped = content.replace(/,(\s*[}\]])/g, "$1");
+    return JSON.parse(stripped);
   } catch (error) {
     if (error.code === "ENOENT") return null;
-    throw error;
+    // If the config file exists but is unparseable (corrupted, exotic JSONC),
+    // treat it as "no config" rather than throwing a 500 that the UI
+    // misinterprets as "opencode not installed".
+    return null;
   }
 };