paperclipai/paperclip · error · Error

Sandbox callback bridge response write wrote invalid result…

Error message

Sandbox callback bridge response write wrote invalid result JSON: ${error instanceof Error ? error.message : String(error)}

What it means

Protocol-parsing failure when writing a bridge response: the atomic write shell script succeeded, but its stdout ('{"wrote":...}') failed to parse as JSON — the remote shell produced unexpected output — so the write result cannot be confirmed.

Solutions

  1. Inspect the write error and retry; the result JSON write failed.
  2. Check disk space and permissions in the bridge queue directory.
Defensive patterns

Strategy: retry

When it happens

Trigger: Thrown at packages/adapter-utils/src/sandbox-callback-bridge.ts:677 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of paperclipai/paperclip@3f1d897a7c (2026-08-18). Data as JSON: /api/errors/cb687ca84bd95425. Report an issue: GitHub.

Appendix: source

Thrown at packages/adapter-utils/src/sandbox-callback-bridge.ts:766

          "  exit 0",
          "fi",
          "cat > \"$temp_path\"",
          "mv \"$temp_path\" \"$response_path\"",
          "printf '{\"wrote\":true}\\n'",
        ].join("\n"),
        timeoutMs,
        shellCommand,
        body,
      );
      requireSuccessfulResult(`write bridge response ${responsePath}`, result);
      try {
        return {
          wrote: JSON.parse(result.stdout.trim())?.wrote === true,
        };
      } catch (error) {
        throw new Error(
          `Sandbox callback bridge response write wrote invalid result JSON: ${error instanceof Error ? error.message : String(error)}`,
        );
      }
    },
    rename: async (fromPath, toPath) => {
      await runChecked(
        `rename ${fromPath}`,
        `mkdir -p ${shellQuote(path.posix.dirname(toPath))} && mv ${shellQuote(fromPath)} ${shellQuote(toPath)}`,
      );
    },
    remove: async (remotePath) => {
      await runChecked(`remove ${remotePath}`, `rm -rf ${shellQuote(remotePath)}`);
    },
  };
}

async function writeBridgeResponse(
  client: SandboxCallbackBridgeQueueClient,
  requestPath: string,
  responsePath: string,

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