opentool-cli
CLI ToolFreeCLI for OpenTool — the open-source MCP tool server. Connect, manage, and execute tools from your terminal.
Capabilities8 decomposed
mcp server discovery and connection management
Medium confidenceEnables users to discover, register, and establish connections to MCP (Model Context Protocol) tool servers through a CLI interface. The CLI maintains a registry of available MCP servers and handles the connection lifecycle, including authentication negotiation and protocol handshaking. Supports both local and remote server endpoints with configurable transport layers (stdio, HTTP, WebSocket).
Provides CLI-first MCP server management with support for multiple transport protocols (stdio, HTTP, WebSocket) in a single unified interface, rather than requiring separate client libraries per transport type
Simpler than building custom MCP clients for each tool server; more flexible than hardcoded tool integrations because it leverages the standardized MCP protocol
tool schema inspection and capability listing
Medium confidenceParses and displays the schema of available tools exposed by connected MCP servers, including input parameters, output types, and tool descriptions. Uses JSON schema introspection to extract tool metadata and presents it in human-readable format. Enables developers to understand tool capabilities before execution without consulting external documentation.
Provides real-time schema introspection directly from the MCP server rather than relying on static documentation, ensuring schema accuracy matches the live server implementation
More accurate than reading docs because it queries live server state; faster than API exploration tools because it's optimized for CLI output
tool execution with parameter binding
Medium confidenceExecutes tools on connected MCP servers by accepting CLI arguments, mapping them to tool parameters via schema validation, and returning structured results. Implements argument parsing with type coercion (string to number, boolean, JSON object) and validates inputs against the tool's JSON schema before transmission. Handles both synchronous and asynchronous tool execution with timeout management.
Implements client-side schema validation with automatic type coercion before tool invocation, reducing round-trips to the server and providing immediate feedback on parameter errors
Faster iteration than raw HTTP calls because validation happens locally; more ergonomic than manual curl commands because it handles schema mapping automatically
configuration file management for server profiles
Medium confidenceStores and loads MCP server connection profiles from configuration files (JSON/YAML), enabling users to define named server configurations with connection parameters, authentication details, and default tool settings. Supports environment variable interpolation for sensitive credentials and profile switching via CLI flags. Configuration is persisted locally and can be version-controlled.
Supports environment variable interpolation in configuration files, allowing credentials to be injected at runtime without storing them in version-controlled config
More flexible than hardcoded server URLs because profiles can be switched per invocation; more secure than embedding credentials in config because it supports env var injection
batch tool execution with result aggregation
Medium confidenceExecutes multiple tools sequentially or in parallel from a batch configuration file, aggregating results into a single output. Supports defining tool chains where output from one tool feeds into the next, with error handling and conditional execution based on previous results. Results are collected and formatted as JSON or CSV for downstream processing.
Supports declarative tool chaining via configuration files with automatic result passing between steps, enabling non-programmers to define complex tool workflows
More accessible than writing custom orchestration code because workflows are defined declaratively; more efficient than sequential CLI invocations because it maintains server connection across steps
output formatting and export options
Medium confidenceTransforms tool execution results into multiple output formats (JSON, YAML, CSV, plain text, markdown) with customizable field selection and filtering. Supports piping results to external tools via stdout and writing to files with automatic format detection. Includes pretty-printing for terminal display and compact formatting for machine consumption.
Provides multiple output formats from a single tool execution result, enabling seamless integration with downstream tools and data pipelines without requiring separate transformation steps
More convenient than piping through jq or other JSON processors because format conversion is built-in; supports more formats than generic tools because it understands MCP tool result structure
interactive repl mode for tool exploration
Medium confidenceProvides an interactive read-eval-print loop where users can execute tools, inspect results, and chain operations without exiting the session. Maintains connection state across multiple tool invocations, supports command history with readline, and provides autocomplete for tool names and parameters. Results from previous commands are accessible as variables for use in subsequent commands.
Maintains persistent connection and state across multiple tool invocations in a single REPL session, enabling rapid iteration and result chaining without connection overhead
More efficient than repeated CLI invocations because it avoids connection setup overhead; more interactive than batch mode because results are immediately visible and can inform next steps
error handling and debugging output
Medium confidenceProvides detailed error messages, stack traces, and debugging information when tool execution fails. Supports verbose logging modes that expose MCP protocol messages, parameter validation errors, and server-side error details. Includes error recovery suggestions and links to relevant documentation. Errors are structured as JSON for programmatic handling in scripts.
Provides structured error output in JSON format alongside human-readable messages, enabling both interactive debugging and programmatic error handling in scripts
More informative than generic error codes because it includes MCP protocol details and recovery suggestions; more actionable than raw server errors because it contextualizes failures
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
Related Artifactssharing capabilities
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MCP Servers Search
** - An MCP server that provides tools for querying and discovering available MCP servers from this list.
@maz-ui/mcp
Maz-UI ModelContextProtocol Client
mcp-client-for-ollama
A text-based user interface (TUI) client for interacting with MCP servers using Ollama. Features include agent mode, multi-server, model switching, streaming responses, tool management, human-in-the-loop, thinking mode, model params config, MCP prompts, custom system prompt and saved preferences. Bu
@mcp-use/inspector
MCP Inspector - A tool for inspecting and debugging MCP servers
@modelcontextprotocol/inspector
Model Context Protocol inspector
@wong2/mcp-cli
A CLI inspector for the Model Context Protocol
Best For
- ✓developers building LLM agents that need tool access
- ✓teams managing multiple MCP tool servers across environments
- ✓AI engineers prototyping multi-tool workflows from the command line
- ✓developers exploring new MCP tool servers interactively
- ✓AI engineers building prompts that reference tool capabilities
- ✓teams documenting tool APIs for non-technical stakeholders
- ✓developers testing MCP tools interactively before integrating into agents
- ✓DevOps engineers building shell scripts that invoke MCP tools
Known Limitations
- ⚠No built-in server auto-discovery — requires manual registration or configuration file
- ⚠Connection state is ephemeral per CLI session — no persistent connection pooling across invocations
- ⚠Limited to MCP protocol version compatibility of the installed CLI version
- ⚠Schema display is read-only — cannot modify tool definitions from CLI
- ⚠Complex nested schemas may be difficult to visualize in terminal output
- ⚠No schema validation against actual tool implementation — relies on server-provided metadata
Requirements
Input / Output
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Package Details
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CLI for OpenTool — the open-source MCP tool server. Connect, manage, and execute tools from your terminal.
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