130 pages for stderr.

pricing Claude Developer Platform · in the page about-claude/pricing …| Additional tokens are consumed by: * Command outputs (stdout/stderr) * Error messages * Large file contents See [tool use pricing](https://platform.claude.com/docs/en/about-claude/pricing#to… bash-tool Claude Developer Platform · in the page agents-and-tools/tool-use/bash-tool …session. 3. Your application returns the command’s output, stdout and stderr together, to Claude in a `tool_result` block. 4. Claude either requests another command in the same session or responds wit… code-execution-tool Claude Developer Platform · in the page agents-and-tools/tool-use/code-execution-tool …data.csv\n-rw-r--r-- 1 user user 180 Jan 1 12:00 config.json", "stderr": "", "return_code": 0, "content": [] } } ``` ### File operation responses **View file:** ```json Output { "… computer-use-tool Claude Developer Platform · in the page agents-and-tools/tool-use/computer-use-tool …```ruby Ruby require "logger" LOGGER = Logger.new($stderr) def log_action(action_type, params, result) LOGGER.info("Action: #{action_type}, Params: #{params}, Result:… Process results programmatically Claude Developer Platform · in the page agents-and-tools/tool-use/programmatic-tool-calling …revenue': 28500}, {'customer_id': 'C3', 'revenue': 24000}]", "stderr": "", "return_code": 0, "content": [] } }, { "type": "text", "text": "I've analyz… Beta Claude Developer Platform · in the page api/beta …_id: string` - `return_code: number` - `stderr: string` - `stdout: string` - `BetaEncryptedCodeExecutionResultBlockParam object`… Messages Claude Developer Platform · in the page api/beta/messages …_id: string` - `return_code: number` - `stderr: string` - `stdout: string` - `BetaEncryptedCodeExecutionResultBlockParam object`… Batches Claude Developer Platform · in the page api/beta/messages/batches …ing` - `return_code: number` - `stderr: string` - `stdout: string` - `BetaEncryptedCodeExecutionResultBlockParam object`… Create a Message Batch Claude Developer Platform · in the page api/beta/messages/batches/create …ing` - `return_code: number` - `stderr: string` - `stdout: string` - `BetaEncryptedCodeExecutionResultBlockParam object`… Retrieve Message Batch results Claude Developer Platform · in the page api/beta/messages/batches/results …string` - `return_code: number` - `stderr: string` - `stdout: string` - `BetaEncryptedCodeExecutionResultBlock object`… Count tokens in a Message Claude Developer Platform · in the page api/beta/messages/count_tokens …_id: string` - `return_code: number` - `stderr: string` - `stdout: string` - `BetaEncryptedCodeExecutionResultBlockParam object`… Create a Message Claude Developer Platform · in the page api/beta/messages/create …_id: string` - `return_code: number` - `stderr: string` - `stdout: string` - `BetaEncryptedCodeExecutionResultBlockParam object`… errors Claude Developer Platform · in the page api/errors …] }' ``` ```bash CLI # The request-id header is printed to stderr with --debug: ant --debug messages create \ --model claude-sonnet-5 \ --max-tokens 1024 \ --message '{role: u… Messages Claude Developer Platform · in the page api/messages …_id: string` - `return_code: number` - `stderr: string` - `stdout: string` - `EncryptedCodeExecutionResultBlockParam object` Th… Batches Claude Developer Platform · in the page api/messages/batches …ing` - `return_code: number` - `stderr: string` - `stdout: string` - `EncryptedCodeExecutionResultBlockParam object`… Create a Message Batch Claude Developer Platform · in the page api/messages/batches/create …ing` - `return_code: number` - `stderr: string` - `stdout: string` - `EncryptedCodeExecutionResultBlockParam object`… Retrieve Message Batch results Claude Developer Platform · in the page api/messages/batches/results …string` - `return_code: number` - `stderr: string` - `stdout: string` - `EncryptedCodeExecutionResultBlock object` T… Count tokens in a Message Claude Developer Platform · in the page api/messages/count_tokens …_id: string` - `return_code: number` - `stderr: string` - `stdout: string` - `EncryptedCodeExecutionResultBlockParam object` Th… Create a Message Claude Developer Platform · in the page api/messages/create …_id: string` - `return_code: number` - `stderr: string` - `stdout: string` - `EncryptedCodeExecutionResultBlockParam object` Th… Before Claude Developer Platform · in the page api/migration-2026-10-21 …ounts as unset. When both of the first two are set, a warning goes to stderr once. The client looks when it is first used, so an `ANTHROPIC_PROFILE` that doesn’t exist now throws from the first reques… claude-platform-on-aws Claude Developer Platform · in the page build-with-claude/claude-platform-on-aws …sponse, including the X-Amzn-Requestid and # Request-Id headers, to stderr ant --debug messages create \ --base-url https://aws-external-anthropic.us-west-2.api.aws \ --workspace-id "$ANTH… mid-conversation-effort-example Claude Developer Platform · in the page build-with-claude/mid-conversation-effort-example …ns the requested command with a timeout, captures combined stdout and stderr, and truncates the result so a runaway command can’t flood the context window. Commands run in the directory you launch the… On a remote host without a browser: Claude Developer Platform · in the page cli-sdks-libraries/cli/authentication …edential, whichever profile you select, and `ant` prints a message to stderr that says so. </Note> ## Manage profiles The `ant profile` subcommands inspect and edit profile state directly: ```bash… using Claude Developer Platform · in the page cli-sdks-libraries/cli/using …| Print full HTTP request and response to stderr… workspaces Claude Developer Platform · in the page manage-claude/workspaces …he HTTP response, including the Anthropic-Workspace-Id # header, to stderr ant --debug messages create \ --model claude-opus-5-5 \ --max-tokens 1024 \ --message '{role: user, content:… spawn.sh: called once per claimed work item Claude Developer Platform · in the page managed-agents/self-hosted-sandboxes …NTHROPIC_WORK_SECRET="+work.Secret, ) launcher.Stdout, launcher.Stderr = os.Stdout, os.Stderr return launcher.Run() } func main() { environmentID := os.Getenv("ANTHROPIC_ENVIRONMENT_I… self-hosted-sandboxes-workers Claude Developer Platform · in the page managed-agents/self-hosted-sandboxes-workers …NTHROPIC_WORK_SECRET="+work.Secret, ) launcher.Stdout, launcher.Stderr = os.Stdout, os.Stderr return launcher.Run() } func main() { environmentID := os.Getenv("ANTHROPIC_ENVIRONMENT_I… Observability with OpenTelemetry Claude Code CLI · in the page agent-sdk/observability …application. To surface exporter errors, set [`CLAUDE_CODE_OTEL_DIAG_STDERR=1`](https://code.claude.com/docs/en/env-vars) alongside the exporter variables and read the diagnostics through the SDK's `… Agent SDK reference - Python Claude Code CLI · in the page agent-sdk/python …efault_factory=dict) max_buffer_size: int | None = None debug_stderr: Any = sys.stderr # Deprecated stderr: Callable[[str], None] | None = None can_use_tool: CanUseTool | None = None… Troubleshoot the Agent SDK Claude Code CLI · in the page agent-sdk/troubleshooting …`` Command failed with exit code 1 (exit code: 1) Error output: Check stderr output for details ``` The message states the exit code twice, and the `Error output` line is fixed text rather than your… Agent SDK reference - TypeScript Claude Code CLI · in the page agent-sdk/typescript …se to run Claude Code in VMs, containers, or remote environments | | `stderr` | `(data: string) => void` | `undefined` | Callback for stderr output | | `strictMcpConfig` | `boolean` | `false` | Use on… Manage multiple agents with agent view Claude Code CLI · in the page agent-view …ge says how it ended, such as `exited 1`, and quotes the start of its stderr. The message also tells you which of these to do next: * Delete the session again to remove the directory anyway, by pre… Auto mode classifier request charges Claude Code CLI · in the page auto-mode-classifier-billing …/code.claude.com/docs/en/headless.md) with `-p` it prints the text to stderr, and in `stream-json` output it emits a `system` warning message, which Agent SDK applications can read from the message st… Best practices for Claude Code Claude Code CLI · in the page best-practices …. Exit code 2 is what blocks the stop. Whatever the command prints to stderr goes back to Claude as the reason it can't finish yet, which is why the compiler output is redirected there: ```json .clau… Claude Code changelog Claude Code CLI · in the page changelog …`claude -p` JSON results (`credential_expires_at`) * Added a one-line stderr warning to `claude -p` text output, starting 10 days before a stored claude.ai sign-in ends * Gateway: Added a log warning… Channels reference Claude Code CLI · in the page channels-reference …ly means a dependency or import error in your server file. To see the stderr trace, restart with `claude --debug --dangerously-load-development-channels server:webhook` and check the debug log at `~/.… Claude apps gateway for Amazon Bedrock, Claude Platform on AWS, Google Cloud, and Microsoft Foundry Claude Code CLI · in the page claude-apps-gateway …nstance credentials resolve on the first request, not at boot. Watch stderr for the boot sequence. Log lines use the format `[gateway] <timestamp> <level> <message>`, audit events are single-line JSO… Claude apps gateway deployment and operations Claude Code CLI · in the page claude-apps-gateway-deploy …es and rollbacks behave. ### Logs The gateway writes two streams to stderr, both JSON-friendly: * **Audit events**: single-line JSON per security-relevant event. Pipe stderr to your log aggregator.… Deploy Claude apps gateway on AWS Claude Code CLI · in the page claude-apps-gateway-on-aws …ECS Fargate > > Create the cluster and a log group for the gateway's stderr, which carries both its audit events and operational logs. Retention is a separate call, and without one CloudWatch keeps t… Use Claude Code in the cloud Claude Code CLI · in the page claude-code-on-the-web …s an unsupported provider or a disabled organization policy, print to stderr without JSON. `--output-format stream-json` isn't supported with `--cloud <session-id>`. If the send fails, see [Errors wh… Explore the context window Claude Code CLI · in the page context-window …` to send info to Claude. For PostToolUse hooks, exit code 2 surfaces stderr as an error but cannot block since the tool already ran. Output over 10,000 characters is saved to a file; Claude gets a pr… Debug your configuration Claude Code CLI · in the page debug-your-config …e count stays at zero, run `claude --debug=mcp` and read the server's stderr in the debug log at `~/.claude/debug/<session-id>.txt`. For configuration locations and scope rules, see [MCP](https://cod… Error reference Claude Code CLI · in the page errors …execution error. With the default text output, the message prints on stderr. * When a [subagent](https://code.claude.com/docs/en/sub-agents.md) hit the limit, the subagent stops before finishing, and… Run Claude Code programmatically Claude Code CLI · in the page headless …status. If you pass an invalid flag, Claude Code reports the error to stderr before the run starts. When a failure happens inside the run, such as missing authentication, Claude Code prints the failur… Hooks reference Claude Code CLI · in the page hooks …`, runs in the background and wakes Claude on exit code 2. The hook's stderr, or stdout if stderr is empty, is shown to Claude as a [system reminder](https://code.claude.com/docs/en/glossary.md#system… Automate actions with hooks Claude Code CLI · in the page hooks-guide …e, so Claude Code blocks the command and shows Claude the guardrail's stderr. The log entry is still written because the logging hook already ran. ### Read input and return output Hooks communicate… Interactive mode Claude Code CLI · in the page interactive-mode …ks are automatically terminated if output exceeds 5GB, with a note in stderr explaining why * On macOS and Linux, Claude Code stops your running background tasks when the operating system reports crit… Connect Claude Code to an LLM gateway Claude Code CLI · in the page llm-gateway-connect …| `Your apiKeyHelper script is failing`, or `apiKeyHelper failed:` on stderr in non-interactive mode | The command in the [`apiKeyHelper`](https://code.claude.com/docs/en/settings-reference#apikeyhelp… Control MCP server access for your organization Claude Code CLI · in the page managed-mcp …ich servers were left out. Claude Code names them in a warning on its stderr, which a self-hosted runner records at the `debug` log level. The `--strict-mcp-config` flag asks to replace the managed s… Deploy managed settings Claude Code CLI · in the page managed-settings …ude doctor` record the failure, and a run with `-p` also prints it to stderr. * For any other read failure, such as an I/O error, every session exits at startup with [a message to contact an administr…