fix: Increase maxBuffer for jq processing to handle large Claude outputs (#473)

Fixes "stdout maxBuffer length exceeded" error by increasing the buffer
from Node.js default of 1MB to 10MB when processing Claude output with jq.
This prevents failures when Claude produces large execution logs.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Claude <noreply@anthropic.com>

action.yml

@@ -166,6 +166,7 @@ runs:
         DEFAULT_WORKFLOW_TOKEN: ${{ github.token }}
         ADDITIONAL_PERMISSIONS: ${{ inputs.additional_permissions }}
         USE_COMMIT_SIGNING: ${{ inputs.use_commit_signing }}
+        ALL_INPUTS: ${{ toJson(inputs) }}
 
     - name: Install Base Action Dependencies
       if: steps.prepare.outputs.contains_trigger == 'true'
@@ -177,7 +178,7 @@ runs:
         echo "Base-action dependencies installed"
         cd -
         # Install Claude Code globally
-        curl -fsSL https://claude.ai/install.sh | bash -s 1.0.83
+        curl -fsSL https://claude.ai/install.sh | bash -s 1.0.86
         echo "$HOME/.local/bin" >> "$GITHUB_PATH"
 
     - name: Setup Network Restrictions
@@ -212,6 +213,7 @@ runs:
         INPUT_CLAUDE_ENV: ${{ inputs.claude_env }}
         INPUT_FALLBACK_MODEL: ${{ inputs.fallback_model }}
         INPUT_EXPERIMENTAL_SLASH_COMMANDS_DIR: ${{ github.action_path }}/slash-commands
+        INPUT_ACTION_INPUTS_PRESENT: ${{ steps.prepare.outputs.action_inputs_present }}
 
         # Model configuration
         ANTHROPIC_MODEL: ${{ inputs.model || inputs.anthropic_model }}

base-action/action.yml

@@ -118,7 +118,7 @@ runs:
 
     - name: Install Claude Code
       shell: bash
-      run: curl -fsSL https://claude.ai/install.sh | bash -s 1.0.83
+      run: curl -fsSL https://claude.ai/install.sh | bash -s 1.0.86
 
     - name: Run Claude Code Action
       shell: bash

base-action/src/run-claude.ts

@@ -110,6 +110,10 @@ export function prepareRunConfig(
   // Parse custom environment variables
   const customEnv = parseCustomEnvVars(options.claudeEnv);
 
+  if (process.env.INPUT_ACTION_INPUTS_PRESENT) {
+    customEnv.GITHUB_ACTION_INPUTS = process.env.INPUT_ACTION_INPUTS_PRESENT;
+  }
+
   return {
     claudeArgs,
     promptPath,
@@ -142,9 +146,11 @@ export async function runClaude(promptPath: string, options: ClaudeOptions) {
   console.log(`Prompt file size: ${promptSize} bytes`);
 
   // Log custom environment variables if any
-  if (Object.keys(config.env).length > 0) {
+  const customEnvKeys = Object.keys(config.env).filter(
-    const envKeys = Object.keys(config.env).join(", ");
+    (key) => key !== "CLAUDE_ACTION_INPUTS_PRESENT",
-    console.log(`Custom environment variables: ${envKeys}`);
+  );
+  if (customEnvKeys.length > 0) {
+    console.log(`Custom environment variables: ${customEnvKeys.join(", ")}`);
   }
 
   // Output to console
@@ -169,7 +175,6 @@ export async function runClaude(promptPath: string, options: ClaudeOptions) {
       ...config.env,
     },
   });
-  console.log("yolo", process.env);
 
   // Handle Claude process errors
   claudeProcess.on("error", (error) => {
@@ -302,7 +307,10 @@ export async function runClaude(promptPath: string, options: ClaudeOptions) {
       await writeFile("output.txt", output);
 
       // Process output.txt into JSON and save to execution file
-      const { stdout: jsonOutput } = await execAsync("jq -s '.' output.txt");
+      // Increase maxBuffer from Node.js default of 1MB to 10MB to handle large Claude outputs
+      const { stdout: jsonOutput } = await execAsync("jq -s '.' output.txt", {
+        maxBuffer: 10 * 1024 * 1024,
+      });
       await writeFile(EXECUTION_FILE, jsonOutput);
 
       console.log(`Log saved to ${EXECUTION_FILE}`);
@@ -319,7 +327,10 @@ export async function runClaude(promptPath: string, options: ClaudeOptions) {
     if (output) {
       try {
         await writeFile("output.txt", output);
-        const { stdout: jsonOutput } = await execAsync("jq -s '.' output.txt");
+        // Increase maxBuffer from Node.js default of 1MB to 10MB to handle large Claude outputs
+        const { stdout: jsonOutput } = await execAsync("jq -s '.' output.txt", {
+          maxBuffer: 10 * 1024 * 1024,
+        });
         await writeFile(EXECUTION_FILE, jsonOutput);
         core.setOutput("execution_file", EXECUTION_FILE);
       } catch (e) {

src/entrypoints/collect-inputs.ts

@@ -0,0 +1,59 @@
+import * as core from "@actions/core";
+
+export function collectActionInputsPresence(): void {
+  const inputDefaults: Record<string, string> = {
+    trigger_phrase: "@claude",
+    assignee_trigger: "",
+    label_trigger: "claude",
+    base_branch: "",
+    branch_prefix: "claude/",
+    allowed_bots: "",
+    mode: "tag",
+    model: "",
+    anthropic_model: "",
+    fallback_model: "",
+    allowed_tools: "",
+    disallowed_tools: "",
+    custom_instructions: "",
+    direct_prompt: "",
+    override_prompt: "",
+    mcp_config: "",
+    additional_permissions: "",
+    claude_env: "",
+    settings: "",
+    anthropic_api_key: "",
+    claude_code_oauth_token: "",
+    github_token: "",
+    max_turns: "",
+    use_sticky_comment: "false",
+    use_commit_signing: "false",
+    experimental_allowed_domains: "",
+  };
+
+  const allInputsJson = process.env.ALL_INPUTS;
+  if (!allInputsJson) {
+    console.log("ALL_INPUTS environment variable not found");
+    core.setOutput("action_inputs_present", JSON.stringify({}));
+    return;
+  }
+
+  let allInputs: Record<string, string>;
+  try {
+    allInputs = JSON.parse(allInputsJson);
+  } catch (e) {
+    console.error("Failed to parse ALL_INPUTS JSON:", e);
+    core.setOutput("action_inputs_present", JSON.stringify({}));
+    return;
+  }
+
+  const presentInputs: Record<string, boolean> = {};
+
+  for (const [name, defaultValue] of Object.entries(inputDefaults)) {
+    const actualValue = allInputs[name] || "";
+
+    const isSet = actualValue !== defaultValue;
+    presentInputs[name] = isSet;
+  }
+
+  core.setOutput("action_inputs_present", JSON.stringify(presentInputs));
+}

src/entrypoints/prepare.ts

@@ -13,9 +13,12 @@ import { parseGitHubContext, isEntityContext } from "../github/context";
 import { getMode, isValidMode, DEFAULT_MODE } from "../modes/registry";
 import type { ModeName } from "../modes/types";
 import { prepare } from "../prepare";
+import { collectActionInputsPresence } from "./collect-inputs";
 
 async function run() {
   try {
+    collectActionInputsPresence();
+
     // Step 1: Get mode first to determine authentication method
     const modeInput = process.env.MODE || DEFAULT_MODE;
 

src/mcp/github-file-ops-server.ts

@@ -3,8 +3,9 @@
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
 import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
 import { z } from "zod";
-import { readFile } from "fs/promises";
+import { readFile, stat } from "fs/promises";
 import { join } from "path";
+import { constants } from "fs";
 import fetch from "node-fetch";
 import { GITHUB_API_URL } from "../github/api/config";
 import { retryWithBackoff } from "../utils/retry";
@@ -162,6 +163,34 @@ async function getOrCreateBranchRef(
   return baseSha;
 }
 
+// Get the appropriate Git file mode for a file
+async function getFileMode(filePath: string): Promise<string> {
+  try {
+    const fileStat = await stat(filePath);
+    if (fileStat.isFile()) {
+      // Check if execute bit is set for user
+      if (fileStat.mode & constants.S_IXUSR) {
+        return "100755"; // Executable file
+      } else {
+        return "100644"; // Regular file
+      }
+    } else if (fileStat.isDirectory()) {
+      return "040000"; // Directory (tree)
+    } else if (fileStat.isSymbolicLink()) {
+      return "120000"; // Symbolic link
+    } else {
+      // Fallback for unknown file types
+      return "100644";
+    }
+  } catch (error) {
+    // If we can't stat the file, default to regular file
+    console.warn(
+      `Could not determine file mode for ${filePath}, using default: ${error}`,
+    );
+    return "100644";
+  }
+}
+
 // Commit files tool
 server.tool(
   "commit_files",
@@ -223,6 +252,9 @@ server.tool(
             ? filePath
             : join(REPO_DIR, filePath);
 
+          // Get the proper file mode based on file permissions
+          const fileMode = await getFileMode(fullPath);
+
           // Check if file is binary (images, etc.)
           const isBinaryFile =
             /\.(png|jpg|jpeg|gif|webp|ico|pdf|zip|tar|gz|exe|bin|woff|woff2|ttf|eot)$/i.test(
@@ -261,7 +293,7 @@ server.tool(
             // Return tree entry with blob SHA
             return {
               path: filePath,
-              mode: "100644",
+              mode: fileMode,
               type: "blob",
               sha: blobData.sha,
             };
@@ -270,7 +302,7 @@ server.tool(
             const content = await readFile(fullPath, "utf-8");
             return {
               path: filePath,
-              mode: "100644",
+              mode: fileMode,
               type: "blob",
               content: content,
             };