execd-api.yaml

openapi: 3.1.0
info:
  title: OpenSandbox Execd API
  version: 1.0.0
  description: |
    OpenSandbox Execd provides a comprehensive API for managing code execution, file operations,
    and system monitoring within a sandboxed environment. The API supports multiple programming
    languages, real-time streaming output via Server-Sent Events (SSE), and complete file system
    management capabilities.

    ## Key Features
    - **Code Execution**: Execute code in Python, JavaScript, and other languages with stateful contexts
    - **Command Execution**: Run shell commands with foreground/background modes
    - **File Operations**: Complete CRUD operations for files and directories
    - **Real-time Streaming**: SSE-based output streaming for code and command execution
    - **System Monitoring**: CPU and memory metrics with real-time watching
    - **Access Control**: Token-based authentication for all API endpoints

  contact:
    name: OpenSandbox Team
    url: https://github.com/alibaba/OpenSandbox
  license:
    name: Apache 2.0
    url: https://www.apache.org/licenses/LICENSE-2.0.html

servers:
  - url: http://localhost:44772
    description: Local development server
  - url: https://api.opensandbox.example.com
    description: Production server

security:
  - AccessToken: []

tags:
  - name: Health
    description: Server health check and status monitoring
  - name: CodeInterpreting
    description: Code execution and context management
  - name: Command
    description: Shell command execution and interruption
  - name: Filesystem
    description: File and directory operations
  - name: Metric
    description: System resource monitoring and metrics

paths:
  /ping:
    get:
      summary: Health check endpoint
      description: |
        Performs a simple health check to verify that the server is running and responsive.
        Returns HTTP 200 OK status if the server is healthy. This endpoint is typically used
        by load balancers, monitoring systems, and orchestration platforms (like Kubernetes)
        to check service availability.
      operationId: ping
      tags:
        - Health
      responses:
        "200":
          description: Server is alive and healthy

  /code/contexts:
    get:
      summary: List active code execution contexts
      description: |
        Lists all active/available code execution contexts.
        If `language` is provided, only contexts under that language/runtime are returned.
      operationId: listContexts
      tags:
        - CodeInterpreting
      parameters:
        - name: language
          in: query
          required: true
          description: Filter contexts by execution runtime (python, bash, java, etc.)
          schema:
            type: string
          example: python
      responses:
        "200":
          description: Array of active contexts
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: "#/components/schemas/CodeContext"
              examples:
                python_only:
                  summary: Context list filtered by language
                  value:
                    - id: session-abc123
                      language: python
                    - id: session-def456
                      language: python
        "400":
          $ref: "#/components/responses/BadRequest"
        "500":
          $ref: "#/components/responses/InternalServerError"

    delete:
      summary: Delete all contexts under a language
      description: |
        Deletes all existing code execution contexts under the specified `language`/runtime.
        This is a bulk operation intended for code-interpreter context cleanup.
      operationId: deleteContextsByLanguage
      tags:
        - CodeInterpreting
      parameters:
        - name: language
          in: query
          required: true
          description: Target execution runtime whose contexts should be deleted
          schema:
            type: string
          example: python
      responses:
        "200":
          description: Contexts deleted successfully
        "400":
          $ref: "#/components/responses/BadRequest"
        "500":
          $ref: "#/components/responses/InternalServerError"

  /code/contexts/{context_id}:
    get:
      summary: Get a code execution context by id
      description: |
        Retrieves the details of an existing code execution context (session) by id.
        Returns the context ID, language, and any associated metadata.
      operationId: getContext
      tags:
        - CodeInterpreting
      parameters:
        - name: context_id
          in: path
          required: true
          description: Session/context id to get
          schema:
            type: string
          example: session-abc123
      responses:
        "200":
          description: Context details retrieved successfully
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/CodeContext"
        "404":
          $ref: "#/components/responses/NotFound"
        "500":
          $ref: "#/components/responses/InternalServerError"
    delete:
      summary: Delete a code execution context by id
      description: |
        Deletes an existing code execution context (session) by id.
        This should terminate the underlying context thread/process and release resources.
      operationId: deleteContext
      tags:
        - CodeInterpreting
      parameters:
        - name: context_id
          in: path
          required: true
          description: Session/context id to delete
          schema:
            type: string
          example: session-abc123
      responses:
        "200":
          description: Context deleted successfully
        "400":
          $ref: "#/components/responses/BadRequest"
        "404":
          $ref: "#/components/responses/NotFound"
        "500":
          $ref: "#/components/responses/InternalServerError"

  /code/context:
    post:
      summary: Create code execution context
      description: |
        Creates a new code execution environment and returns a session ID that can be used
        for subsequent code execution requests. The context maintains state across multiple
        code executions within the same session.
      operationId: createCodeContext
      tags:
        - CodeInterpreting
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/CodeContextRequest"
            examples:
              python:
                summary: Create Python context
                value:
                  language: python
              bash:
                summary: Create Bash context
                value:
                  language: bash
      responses:
        "200":
          description: Successfully created context with session ID
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/CodeContext"
        "400":
          $ref: "#/components/responses/BadRequest"
        "500":
          $ref: "#/components/responses/InternalServerError"

  /code:
    post:
      summary: Execute code in context
      description: |
        Executes code using Jupyter kernel in a specified execution context and streams
        the output in real-time using SSE (Server-Sent Events). Supports multiple programming
        languages (Python, JavaScript, etc.) and maintains execution state within the session.
        Returns execution results, output streams, execution count, and any errors.
      operationId: runCode
      tags:
        - CodeInterpreting
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/RunCodeRequest"
            examples:
              python:
                summary: Execute Python code
                value:
                  context:
                    id: session-123
                    language: python
                  code: |
                    print("Hello, World!")
                    result = 2 + 2
                    result
              stateless:
                summary: Stateless execution
                value:
                  code: echo "Hello from shell"
      responses:
        "200":
          description: Stream of code execution events
          content:
            text/event-stream:
              schema:
                $ref: "#/components/schemas/ServerStreamEvent"
        "400":
          $ref: "#/components/responses/BadRequest"
        "500":
          $ref: "#/components/responses/InternalServerError"

    delete:
      summary: Interrupt code execution
      description: |
        Interrupts the currently running code execution in the specified context.
        This sends a signal to terminate the execution process and releases associated resources.
      operationId: interruptCode
      tags:
        - CodeInterpreting
      parameters:
        - name: id
          in: query
          required: true
          description: Session ID of the execution context to interrupt
          schema:
            type: string
          example: session-123
      responses:
        "200":
          description: Code execution successfully interrupted
        "400":
          $ref: "#/components/responses/BadRequest"
        "500":
          $ref: "#/components/responses/InternalServerError"

  /command:
    post:
      summary: Execute shell command
      description: |
        Executes a shell command and streams the output in real-time using SSE (Server-Sent Events).
        The command can run in foreground or background mode. The response includes stdout, stderr,
        execution status, and completion events.
        Optionally specify `timeout` (milliseconds) to enforce a maximum runtime; the server will
        terminate the process when the timeout is reached.
      operationId: runCommand
      tags:
        - Command
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/RunCommandRequest"
            examples:
              foreground:
                summary: Foreground command
                value:
                  command: ls -la /workspace
                  cwd: /workspace
                  background: false
                  timeout: 30000
              background:
                summary: Background command
                value:
                  command: python server.py
                  cwd: /app
                  background: true
                  timeout: 120000
      responses:
        "200":
          description: Stream of command execution events
          content:
            text/event-stream:
              schema:
                $ref: "#/components/schemas/ServerStreamEvent"
        "400":
          $ref: "#/components/responses/BadRequest"
        "500":
          $ref: "#/components/responses/InternalServerError"

    delete:
      summary: Interrupt command execution
      description: |
        Interrupts the currently running command execution in the specified context.
        This sends a signal to terminate the execution process and releases associated resources.
      operationId: interruptCommand
      tags:
        - Command
      parameters:
        - name: id
          in: query
          required: true
          description: Session ID of the execution context to interrupt
          schema:
            type: string
          example: session-456
      responses:
        "200":
          description: Command execution successfully interrupted
        "400":
          $ref: "#/components/responses/BadRequest"
        "500":
          $ref: "#/components/responses/InternalServerError"

  /command/status/{id}:
    get:
      summary: Get command running status
      description: |
        Returns the current status of a command (foreground or background) by command ID.
        Includes running flag, exit code, error (if any), and start/finish timestamps.
      operationId: getCommandStatus
      tags:
        - Command
      parameters:
        - name: id
          in: path
          required: true
          description: Command ID returned by RunCommand
          schema:
            type: string
          example: cmd-abc123
      responses:
        "200":
          description: Command status
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/CommandStatusResponse"
        "400":
          $ref: "#/components/responses/BadRequest"
        "404":
          $ref: "#/components/responses/NotFound"
        "500":
          $ref: "#/components/responses/InternalServerError"

  /command/{id}/logs:
    get:
      summary: Get background command stdout/stderr (non-streamed)
      description: |
        Returns stdout and stderr for a background (detached) command by command ID.
        Foreground commands should be consumed via SSE; this endpoint is intended for
        polling logs of background commands. Supports incremental reads similar to a file seek:
        pass a starting line via query to fetch output after that line and receive the latest
        tail cursor for the next poll. When no starting line is provided, the full logs are returned.
        Response body is plain text so it can be rendered directly in browsers; the latest line index
        is provided via response header `EXECD-COMMANDS-TAIL-CURSOR` for subsequent incremental requests.
      operationId: getBackgroundCommandLogs
      tags:
        - Command
      parameters:
        - name: id
          in: path
          required: true
          description: Command ID returned by RunCommand
          schema:
            type: string
          example: cmd-abc123
        - name: cursor
          in: query
          required: false
          description: |
            Optional 0-based line cursor (behaves like a file seek). When provided, only
            stdout/stderr lines after this line are returned. The response includes the
            latest line index (`cursor`) so the client can request incremental output
            on subsequent calls. If omitted, the full log is returned.
          schema:
            type: integer
            format: int64
            minimum: 0
          example: 120
      responses:
        "200":
          description: Command output (plain text) and status metadata via headers
          content:
            text/plain:
              schema:
                type: string
              example: |
                line1
                line2
                warn: something on stderr
          headers:
            EXECD-COMMANDS-TAIL-CURSOR:
              description: Highest available 0-based line index after applying the request cursor (use as the next cursor for incremental reads)
              schema:
                type: integer
                format: int64
        "400":
          $ref: "#/components/responses/BadRequest"
        "404":
          $ref: "#/components/responses/NotFound"
        "500":
          $ref: "#/components/responses/InternalServerError"

  /files/info:
    get:
      summary: Get file metadata
      description: |
        Retrieves detailed metadata for one or multiple files including permissions, owner,
        group, size, and modification time. Returns a map of file paths to their corresponding
        FileInfo objects.
      operationId: getFilesInfo
      tags:
        - Filesystem
      parameters:
        - name: path
          in: query
          required: true
          description: File path(s) to get info for (can be specified multiple times)
          schema:
            type: array
            items:
              type: string
          style: form
          explode: true
          examples:
            single:
              summary: Single file
              value: ["/workspace/file.txt"]
            multiple:
              summary: Multiple files
              value: ["/workspace/file1.txt", "/workspace/file2.py"]
      responses:
        "200":
          description: Map of file paths to FileInfo objects
          content:
            application/json:
              schema:
                type: object
                additionalProperties:
                  $ref: "#/components/schemas/FileInfo"
        "404":
          $ref: "#/components/responses/NotFound"
        "500":
          $ref: "#/components/responses/InternalServerError"

  /files:
    delete:
      summary: Delete files
      description: |
        Deletes one or multiple files from the sandbox. Only removes files, not directories.
        Use RemoveDirs for directory removal.
      operationId: removeFiles
      tags:
        - Filesystem
      parameters:
        - name: path
          in: query
          required: true
          description: File path(s) to delete (can be specified multiple times)
          schema:
            type: array
            items:
              type: string
          style: form
          explode: true
          example: ["/workspace/temp.txt"]
      responses:
        "200":
          description: Files deleted successfully
        "500":
          $ref: "#/components/responses/InternalServerError"

  /files/permissions:
    post:
      summary: Change file permissions
      description: |
        Changes permissions (mode), owner, and group for one or multiple files.
        Accepts a map of file paths to permission settings including octal mode,
        owner username, and group name.
      operationId: chmodFiles
      tags:
        - Filesystem
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              additionalProperties:
                $ref: "#/components/schemas/Permission"
            example:
              "/workspace/script.sh":
                owner: admin
                group: admin
                mode: 755
              "/workspace/config.json":
                owner: admin
                group: admin
                mode: 755
      responses:
        "200":
          description: Permissions changed successfully
        "400":
          $ref: "#/components/responses/BadRequest"
        "500":
          $ref: "#/components/responses/InternalServerError"

  /files/mv:
    post:
      summary: Rename or move files
      description: |
        Renames or moves one or multiple files to new paths. Can be used for both
        renaming within the same directory and moving to different directories.
        Target directory must exist.
      operationId: renameFiles
      tags:
        - Filesystem
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: array
              items:
                $ref: "#/components/schemas/RenameFileItem"
            example:
              - src: /workspace/old_name.txt
                dest: /workspace/new_name.txt
              - src: /workspace/file.py
                dest: /archive/file.py
      responses:
        "200":
          description: Files renamed/moved successfully
        "400":
          $ref: "#/components/responses/BadRequest"
        "404":
          $ref: "#/components/responses/NotFound"
        "500":
          $ref: "#/components/responses/InternalServerError"

  /files/search:
    get:
      summary: Search for files
      description: |
        Searches for files matching a glob pattern within a specified directory and
        its subdirectories. Returns file metadata including path, permissions, owner,
        and group. Supports glob patterns like **, *.txt, etc. Default pattern is ** (all files).
      operationId: searchFiles
      tags:
        - Filesystem
      parameters:
        - name: path
          in: query
          required: true
          description: Root directory path to search in
          schema:
            type: string
        - name: pattern
          in: query
          required: false
          description: Glob pattern to match files (default is **)
          schema:
            type: string
            default: "**"
      responses:
        "200":
          description: Array of matching files with metadata
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: "#/components/schemas/FileInfo"
        "400":
          $ref: "#/components/responses/BadRequest"
        "404":
          $ref: "#/components/responses/NotFound"
        "500":
          $ref: "#/components/responses/InternalServerError"

  /files/replace:
    post:
      summary: Replace file content
      description: |
        Performs text replacement in one or multiple files. Replaces all occurrences
        of the old string with the new string (similar to strings.ReplaceAll).
        Preserves file permissions. Useful for batch text substitution across files.
      operationId: replaceContent
      tags:
        - Filesystem
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              additionalProperties:
                $ref: "#/components/schemas/ReplaceFileContentItem"
            example:
              "/workspace/config.yaml":
                old: "localhost:8080"
                new: "0.0.0.0:9090"
              "/workspace/app.py":
                old: "DEBUG = True"
                new: "DEBUG = False"
      responses:
        "200":
          description: Content replaced successfully
        "400":
          $ref: "#/components/responses/BadRequest"
        "500":
          $ref: "#/components/responses/InternalServerError"

  /files/upload:
    post:
      summary: Upload files to sandbox
      description: |
        Uploads one or multiple files to specified paths within the sandbox.
        Reads metadata and file content from multipart form parts in sequence.
        Each file upload consists of two parts: a metadata part (JSON) followed
        by the actual file part.
      operationId: uploadFile
      tags:
        - Filesystem
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
              properties:
                metadata:
                  type: string
                  description: JSON-encoded file metadata (FileMetadata object)
                  example: '{"path":"/workspace/file.txt","owner":"admin","group":"admin","mode":755}'
                file:
                  type: string
                  format: binary
                  description: File to upload
            encoding:
              metadata:
                contentType: application/json
              file:
                contentType: application/octet-stream
      responses:
        "200":
          description: Files uploaded successfully
        "400":
          $ref: "#/components/responses/BadRequest"
        "500":
          $ref: "#/components/responses/InternalServerError"

  /files/download:
    get:
      summary: Download file from sandbox
      description: |
        Downloads a file from the specified path within the sandbox. Supports HTTP
        range requests for resumable downloads and partial content retrieval.
        Returns file as octet-stream with appropriate headers.
      operationId: downloadFile
      tags:
        - Filesystem
      parameters:
        - name: path
          in: query
          required: true
          description: Absolute or relative path of the file to download
          schema:
            type: string
          example: /workspace/data.csv
        - name: Range
          in: header
          required: false
          description: HTTP Range header for partial content requests
          schema:
            type: string
          example: "bytes=0-1023"
      responses:
        "200":
          description: File content
          content:
            application/octet-stream:
              schema:
                type: string
                format: binary
          headers:
            Content-Disposition:
              schema:
                type: string
              description: Attachment header with filename
            Content-Length:
              schema:
                type: integer
              description: File size in bytes
        "206":
          description: Partial file content (when Range header is provided)
          content:
            application/octet-stream:
              schema:
                type: string
                format: binary
          headers:
            Content-Range:
              schema:
                type: string
              description: Range of bytes being returned
            Content-Length:
              schema:
                type: integer
              description: Length of the returned range
        "400":
          $ref: "#/components/responses/BadRequest"
        "404":
          $ref: "#/components/responses/NotFound"
        "416":
          description: Requested range not satisfiable
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ErrorResponse"
        "500":
          $ref: "#/components/responses/InternalServerError"

  /directories:
    post:
      summary: Create directories
      description: |
        Creates one or multiple directories with specified permissions. Creates parent
        directories as needed (similar to mkdir -p). Accepts a map of directory paths
        to permission objects.
      operationId: makeDirs
      tags:
        - Filesystem
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              additionalProperties:
                $ref: "#/components/schemas/Permission"
            example:
              "/workspace/project":
                owner: admin
                group: admin
                mode: 755
              "/workspace/logs":
                owner: admin
                group: admin
                mode: 755
      responses:
        "200":
          description: Directories created successfully
        "400":
          $ref: "#/components/responses/BadRequest"
        "500":
          $ref: "#/components/responses/InternalServerError"

    delete:
      summary: Delete directories
      description: |
        Recursively deletes one or multiple directories and all their contents.
        Similar to rm -rf. Use with caution as this operation cannot be undone.
      operationId: removeDirs
      tags:
        - Filesystem
      parameters:
        - name: path
          in: query
          required: true
          description: Directory path(s) to delete (can be specified multiple times)
          schema:
            type: array
            items:
              type: string
          style: form
          explode: true
          example: ["/workspace/temp"]
      responses:
        "200":
          description: Directories deleted successfully
        "500":
          $ref: "#/components/responses/InternalServerError"

  /metrics:
    get:
      summary: Get system metrics
      description: |
        Retrieves current system resource metrics including CPU usage percentage,
        CPU core count, total memory, used memory, and timestamp. Provides a snapshot
        of system resource utilization at the time of request.
      operationId: getMetrics
      tags:
        - Metric
      responses:
        "200":
          description: Current system metrics including CPU and memory usage
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Metrics"
        "500":
          $ref: "#/components/responses/InternalServerError"

  /metrics/watch:
    get:
      summary: Watch system metrics in real-time
      description: |
        Streams system resource metrics in real-time using Server-Sent Events (SSE).
        Updates are sent every second, providing continuous monitoring of CPU usage,
        memory usage, and other system metrics. The connection remains open until
        the client disconnects.
      operationId: watchMetrics
      tags:
        - Metric
      responses:
        "200":
          description: Stream of system metrics updated every second
          content:
            text/event-stream:
              schema:
                $ref: "#/components/schemas/Metrics"
        "500":
          $ref: "#/components/responses/InternalServerError"

components:
  securitySchemes:
    AccessToken:
      type: apiKey
      in: header
      name: X-EXECD-ACCESS-TOKEN
      description: |
        Access token for API authentication. All requests must include this header
        with a valid token. The token is configured during server initialization.

  schemas:
    CodeContextRequest:
      type: object
      description: Request to create a code execution context
      properties:
        language:
          type: string
          description: Execution runtime (python, bash, java, etc.)
          example: python

    CodeContext:
      type: object
      description: Code execution context with session identifier
      properties:
        id:
          type: string
          description: Unique session identifier returned by CreateContext
          example: session-abc123
        language:
          type: string
          description: Execution runtime
          example: python
      required:
        - language

    RunCodeRequest:
      type: object
      required:
        - code
      description: Request to execute code in a context
      properties:
        context:
          $ref: "#/components/schemas/CodeContext"
        code:
          type: string
          description: Source code to execute
          example: |
            import numpy as np
            result = np.array([1, 2, 3])
            print(result)

    RunCommandRequest:
      type: object
      required:
        - command
      description: Request to execute a shell command
      properties:
        command:
          type: string
          description: Shell command to execute
          example: ls -la /workspace
        cwd:
          type: string
          description: Working directory for command execution
          example: /workspace
        background:
          type: boolean
          description: Whether to run command in detached mode
          default: false
          example: false
        timeout:
          type: integer
          format: int64
          description: Maximum allowed execution time in milliseconds before the command is forcefully terminated by the server. If omitted, the server will not enforce any timeout.
          example: 60000

    CommandStatusResponse:
      type: object
      description: Command execution status (foreground or background)
      properties:
        id:
          type: string
          description: Command ID returned by RunCommand
          example: cmd-abc123
        content:
          type: string
          description: Original command content
          example: ls -la
        running:
          type: boolean
          description: Whether the command is still running
          example: false
        exit_code:
          type: integer
          format: int32
          nullable: true
          description: Exit code if the command has finished
          example: 0
        error:
          type: string
          description: Error message if the command failed
          example: permission denied
        started_at:
          type: string
          format: date-time
          description: Start time in RFC3339 format
          example: "2025-12-22T09:08:05Z"
        finished_at:
          type: string
          format: date-time
          nullable: true
          description: Finish time in RFC3339 format (null if still running)
          example: "2025-12-22T09:08:09Z"

    ServerStreamEvent:
      type: object
      description: Server-sent event for streaming execution output
      properties:
        type:
          type: string
          enum:
            - init
            - status
            - error
            - stdout
            - stderr
            - result
            - execution_complete
            - execution_count
            - ping
          description: Event type for client-side handling
          example: stdout
        text:
          type: string
          description: Textual data for status, init, and stream events
          example: "Hello, World!\n"
        execution_count:
          type: integer
          description: Cell execution number in the session
          example: 1
        execution_time:
          type: integer
          format: int64
          description: Execution duration in milliseconds
          example: 150
        timestamp:
          type: integer
          format: int64
          description: When the event was generated (Unix milliseconds)
          example: 1700000000000
        results:
          type: object
          additionalProperties: true
          description: Execution output in various MIME types (e.g., "text/plain", "text/html")
          example:
            text/plain: "4"
        error:
          type: object
          description: Execution error details if an error occurred
          properties:
            ename:
              type: string
              description: Error name/type
              example: "NameError"
            evalue:
              type: string
              description: Error value/message
              example: "name 'undefined_var' is not defined"
            traceback:
              type: array
              items:
                type: string
              description: Stack trace lines
              example:
                - "Traceback (most recent call last):"
                - '  File "<stdin>", line 1, in <module>'
                - "NameError: name 'undefined_var' is not defined"

    FileInfo:
      type: object
      description: File metadata including path and permissions
      properties:
        path:
          type: string
          description: Absolute file path
          example: /workspace/file.txt
        size:
          type: integer
          format: int64
          description: File size in bytes
          example: 2048
        modified_at:
          type: string
          format: date-time
          description: Last modification time
          example: 2025-11-16T14:30:45Z
        created_at:
          type: string
          format: date-time
          description: File creation time
          example: 2025-11-16T14:30:45Z
        owner:
          type: string
          description: File owner username
          example: admin
        group:
          type: string
          description: File group name
          example: admin
        mode:
          type: integer
          description: File permissions in octal format
          example: 755
      required: [path, size, modified_at, created_at, owner, group, mode]

    Permission:
      type: object
      description: File ownership and mode settings
      properties:
        owner:
          type: string
          description: Owner username
          example: root
        group:
          type: string
          description: Group name
          example: root
        mode:
          type: integer
          description: Permission mode in octal format (e.g., 644, 755)
          default: 755
          example: 755
      required: [mode]

    FileMetadata:
      type: object
      description: File metadata for upload operations
      properties:
        path:
          type: string
          description: Target file path
          example: /workspace/upload.txt
        owner:
          type: string
          description: File owner
          example: admin
        group:
          type: string
          description: File group
          example: admin
        mode:
          type: integer
          description: File permissions in octal
          example: 755

    RenameFileItem:
      type: object
      description: File rename/move operation
      properties:
        src:
          type: string
          description: Source file path
          example: /workspace/old.txt
        dest:
          type: string
          description: Destination file path
          example: /workspace/new.txt
      required: [src, dest]

    ReplaceFileContentItem:
      type: object
      description: Content replacement operation
      properties:
        old:
          type: string
          description: String to be replaced
          example: "localhost"
        new:
          type: string
          description: Replacement string
          example: "0.0.0.0"
      required: [old, new]

    Metrics:
      type: object
      description: System resource usage metrics
      properties:
        cpu_count:
          type: number
          format: float
          description: Number of CPU cores
          example: 4.0
        cpu_used_pct:
          type: number
          format: float
          description: CPU usage percentage
          example: 45.5
        mem_total_mib:
          type: number
          format: float
          description: Total memory in MiB
          example: 8192.0
        mem_used_mib:
          type: number
          format: float
          description: Used memory in MiB
          example: 4096.0
        timestamp:
          type: integer
          format: int64
          description: Timestamp when metrics were collected (Unix milliseconds)
          example: 1700000000000
      required:
        [cpu_count, cpu_used_pct, mem_total_mib, mem_used_mib, timestamp]

    ErrorResponse:
      type: object
      description: Standard error response format
      properties:
        code:
          type: string
          description: Error code for programmatic handling
          example: INVALID_REQUEST_BODY
        message:
          type: string
          description: Human-readable error message
          example: "error parsing request, MAYBE invalid body format"
      required: [code, message]

  responses:
    BadRequest:
      description: Invalid request body format or missing required fields
      content:
        application/json:
          schema:
            $ref: "#/components/schemas/ErrorResponse"
          example:
            code: INVALID_REQUEST_BODY
            message: "error parsing request, MAYBE invalid body format"

    NotFound:
      description: File or resource not found
      content:
        application/json:
          schema:
            $ref: "#/components/schemas/ErrorResponse"
          example:
            code: FILE_NOT_FOUND
            message: "file not found"

    InternalServerError:
      description: Runtime server error during operation
      content:
        application/json:
          schema:
            $ref: "#/components/schemas/ErrorResponse"
          example:
            code: RUNTIME_ERROR
            message: "error running code execution"