762 pages for error.

Versioning Model Context Protocol · in the page docs/2024-11-05/learn/versioning …le version to use for the session. The protocol provides appropriate error handling if version negotiation fails, allowing clients to gracefully terminate connections when they cannot find a version… Debugging Model Context Protocol · in the page docs/2024-11-05/tools/debugging …1-05/basic/transports#stdio), all messages logged to stderr (standard error) will be captured by the host application automatically. <Warning> Local MCP servers should not log messages to stdout (s… MCP Inspector Model Context Protocol · in the page docs/2024-11-05/tools/inspector …* Missing prompt arguments * Concurrent operations * Verify error handling and error responses ## Next steps <CardGroup cols={2}> <Card title="Inspector Repository" icon="github" href="h… Understanding Authorization in MCP Model Context Protocol · in the page docs/2024-11-05/tutorials/security/authorization …a.introspection_endpoint; if (!endpoint) { console.error("[auth] no introspection endpoint in metadata"); throw new Error("No token verification endpoint available in meta… Security Best Practices Model Context Protocol · in the page docs/2024-11-05/tutorials/security/security_best_practices …Internal-->>Client: Cloud credentials/metadata Note over Client: Error or response details leak to attacker Client->>MCP: Subsequent request with error details ``` #### Risks * **Credential… Build an MCP client Model Context Protocol · in the page docs/2025-03-26/develop/build-client …th('.js') if not (is_python or is_js): raise ValueError("Server script must be a .py or .js file") command = "python" if is_python else "node" server_params = Stdi… Build an MCP server Model Context Protocol · in the page docs/2025-03-26/develop/build-server …tr, Any] | None: """Make a request to the NWS API with proper error handling.""" headers = {"User-Agent": USER_AGENT, "Accept": "application/geo+json"} async with httpx.AsyncCl… Build with Agent Skills Model Context Protocol · in the page docs/2025-03-26/develop/build-with-agent-skills …nce your agent scaffolds the server, iterate on tool descriptions and error handling, then test and ship: <CardGroup cols={2}> <Card title="MCP Inspector" icon="magnifying-glass" href="/docs/2025-0… Client Best Practices Model Context Protocol · in the page docs/2025-03-26/develop/clients/client-best-practices …ring; level: string; } function logging_getLogs(input: { level: "error" | "warn" | "info"; since: number; }): Promise<{ entries: LogEntry[] }> { return mcp.callTool<{ entries: LogEntry[] }>("… Connect to local MCP servers Model Context Protocol · in the page docs/2025-03-26/develop/connect-local-servers …me` as you did in `claude_desktop_config.json`) to see if you get any errors: <CodeGroup> ```bash macOS/Linux theme={null} npx -y @modelcontextprotocol/server-filesystem /Users/userna… Architecture overview Model Context Protocol · in the page docs/2025-03-26/learn/architecture …r are using compatible protocol versions. This prevents communication errors that could occur when different versions attempt to interact. If a mutually compatible version is not negotiated, the conne… Versioning Model Context Protocol · in the page docs/2025-03-26/learn/versioning …le version to use for the session. The protocol provides appropriate error handling if version negotiation fails, allowing clients to gracefully terminate connections when they cannot find a version… Debugging Model Context Protocol · in the page docs/2025-03-26/tools/debugging …3-26/basic/transports#stdio), all messages logged to stderr (standard error) will be captured by the host application automatically. <Warning> Local MCP servers should not log messages to stdout (s… MCP Inspector Model Context Protocol · in the page docs/2025-03-26/tools/inspector …* Missing prompt arguments * Concurrent operations * Verify error handling and error responses ## Next steps <CardGroup cols={2}> <Card title="Inspector Repository" icon="github" href="h… Understanding Authorization in MCP Model Context Protocol · in the page docs/2025-03-26/tutorials/security/authorization …a.introspection_endpoint; if (!endpoint) { console.error("[auth] no introspection endpoint in metadata"); throw new Error("No token verification endpoint available in meta… Security Best Practices Model Context Protocol · in the page docs/2025-03-26/tutorials/security/security_best_practices …Internal-->>Client: Cloud credentials/metadata Note over Client: Error or response details leak to attacker Client->>MCP: Subsequent request with error details ``` #### Risks * **Credential… Build an MCP client Model Context Protocol · in the page docs/2025-06-18/develop/build-client …th('.js') if not (is_python or is_js): raise ValueError("Server script must be a .py or .js file") command = "python" if is_python else "node" server_params = Stdi… Build an MCP server Model Context Protocol · in the page docs/2025-06-18/develop/build-server …tr, Any] | None: """Make a request to the NWS API with proper error handling.""" headers = {"User-Agent": USER_AGENT, "Accept": "application/geo+json"} async with httpx.AsyncCl… Build with Agent Skills Model Context Protocol · in the page docs/2025-06-18/develop/build-with-agent-skills …nce your agent scaffolds the server, iterate on tool descriptions and error handling, then test and ship: <CardGroup cols={2}> <Card title="MCP Inspector" icon="magnifying-glass" href="/docs/2025-0… Client Best Practices Model Context Protocol · in the page docs/2025-06-18/develop/clients/client-best-practices …ring; level: string; } function logging_getLogs(input: { level: "error" | "warn" | "info"; since: number; }): Promise<{ entries: LogEntry[] }> { return mcp.callTool<{ entries: LogEntry[] }>("… Connect to local MCP servers Model Context Protocol · in the page docs/2025-06-18/develop/connect-local-servers …me` as you did in `claude_desktop_config.json`) to see if you get any errors: <CodeGroup> ```bash macOS/Linux theme={null} npx -y @modelcontextprotocol/server-filesystem /Users/userna… Architecture overview Model Context Protocol · in the page docs/2025-06-18/learn/architecture …r are using compatible protocol versions. This prevents communication errors that could occur when different versions attempt to interact. If a mutually compatible version is not negotiated, the conne… Versioning Model Context Protocol · in the page docs/2025-06-18/learn/versioning …le version to use for the session. The protocol provides appropriate error handling if version negotiation fails, allowing clients to gracefully terminate connections when they cannot find a version… Debugging Model Context Protocol · in the page docs/2025-06-18/tools/debugging …6-18/basic/transports#stdio), all messages logged to stderr (standard error) will be captured by the host application automatically. <Warning> Local MCP servers should not log messages to stdout (s… MCP Inspector Model Context Protocol · in the page docs/2025-06-18/tools/inspector …* Missing prompt arguments * Concurrent operations * Verify error handling and error responses ## Next steps <CardGroup cols={2}> <Card title="Inspector Repository" icon="github" href="h… Understanding Authorization in MCP Model Context Protocol · in the page docs/2025-06-18/tutorials/security/authorization …a.introspection_endpoint; if (!endpoint) { console.error("[auth] no introspection endpoint in metadata"); throw new Error("No token verification endpoint available in meta… Security Best Practices Model Context Protocol · in the page docs/2025-06-18/tutorials/security/security_best_practices …Internal-->>Client: Cloud credentials/metadata Note over Client: Error or response details leak to attacker Client->>MCP: Subsequent request with error details ``` #### Risks * **Credential… Build an MCP client Model Context Protocol · in the page docs/2025-11-25/develop/build-client …th('.js') if not (is_python or is_js): raise ValueError("Server script must be a .py or .js file") command = "python" if is_python else "node" server_params = Stdi… Build an MCP server Model Context Protocol · in the page docs/2025-11-25/develop/build-server …tr, Any] | None: """Make a request to the NWS API with proper error handling.""" headers = {"User-Agent": USER_AGENT, "Accept": "application/geo+json"} async with httpx.AsyncCl… Build with Agent Skills Model Context Protocol · in the page docs/2025-11-25/develop/build-with-agent-skills …nce your agent scaffolds the server, iterate on tool descriptions and error handling, then test and ship: <CardGroup cols={2}> <Card title="MCP Inspector" icon="magnifying-glass" href="/docs/2025-1… Client Best Practices Model Context Protocol · in the page docs/2025-11-25/develop/clients/client-best-practices …ring; level: string; } function logging_getLogs(input: { level: "error" | "warn" | "info"; since: number; }): Promise<{ entries: LogEntry[] }> { return mcp.callTool<{ entries: LogEntry[] }>("… Connect to local MCP servers Model Context Protocol · in the page docs/2025-11-25/develop/connect-local-servers …me` as you did in `claude_desktop_config.json`) to see if you get any errors: <CodeGroup> ```bash macOS/Linux theme={null} npx -y @modelcontextprotocol/server-filesystem /Users/userna… Architecture overview Model Context Protocol · in the page docs/2025-11-25/learn/architecture …r are using compatible protocol versions. This prevents communication errors that could occur when different versions attempt to interact. If a mutually compatible version is not negotiated, the conne… Versioning Model Context Protocol · in the page docs/2025-11-25/learn/versioning …le version to use for the session. The protocol provides appropriate error handling if version negotiation fails, allowing clients to gracefully terminate connections when they cannot find a version… Debugging Model Context Protocol · in the page docs/2025-11-25/tools/debugging …1-25/basic/transports#stdio), all messages logged to stderr (standard error) will be captured by the host application automatically. <Warning> Local MCP servers should not log messages to stdout (s… MCP Inspector Model Context Protocol · in the page docs/2025-11-25/tools/inspector …* Missing prompt arguments * Concurrent operations * Verify error handling and error responses ## Next steps <CardGroup cols={2}> <Card title="Inspector Repository" icon="github" href="h… Understanding Authorization in MCP Model Context Protocol · in the page docs/2025-11-25/tutorials/security/authorization …a.introspection_endpoint; if (!endpoint) { console.error("[auth] no introspection endpoint in metadata"); throw new Error("No token verification endpoint available in meta… Security Best Practices Model Context Protocol · in the page docs/2025-11-25/tutorials/security/security_best_practices …Internal-->>Client: Cloud credentials/metadata Note over Client: Error or response details leak to attacker Client->>MCP: Subsequent request with error details ``` #### Risks * **Credential… Build an MCP client Model Context Protocol · in the page docs/2026-07-28/develop/build-client …"): command = "node" else: raise ValueError("Server script must be a .py or .js file") return StdioServerParameters(command=command, args=[server_script_path])… Build an MCP server Model Context Protocol · in the page docs/2026-07-28/develop/build-server …tr, Any] | None: """Make a request to the NWS API with proper error handling.""" headers = {"User-Agent": USER_AGENT, "Accept": "application/geo+json"} async with httpx2.AsyncC… Build with Agent Skills Model Context Protocol · in the page docs/2026-07-28/develop/build-with-agent-skills …nce your agent scaffolds the server, iterate on tool descriptions and error handling, then test and ship: <CardGroup cols={2}> <Card title="MCP Inspector" icon="magnifying-glass" href="/docs/2026-0… Client Best Practices Model Context Protocol · in the page docs/2026-07-28/develop/clients/client-best-practices …ring; level: string; } function logging_getLogs(input: { level: "error" | "warn" | "info"; since: number; }): Promise<{ entries: LogEntry[] }> { return mcp.callTool<{ entries: LogEntry[] }>("… Connect to local MCP servers Model Context Protocol · in the page docs/2026-07-28/develop/connect-local-servers …me` as you did in `claude_desktop_config.json`) to see if you get any errors: <CodeGroup> ```bash macOS/Linux theme={null} npx -y @modelcontextprotocol/server-filesystem /Users/userna… Architecture overview Model Context Protocol · in the page docs/2026-07-28/learn/architecture …ed version, it rejects the request with an `UnsupportedProtocolVersionError` listing the versions it does support, and the client retries with a mutually supported version. 2. **Capability Discov… Versioning Model Context Protocol · in the page docs/2026-07-28/learn/versioning …he requested version, it responds with an [`UnsupportedProtocolVersionError`](/specification/2026-07-28/basic/versioning#protocol-version-negotiation) listing the versions it does support. The client… Debugging Model Context Protocol · in the page docs/2026-07-28/tools/debugging …7-28/basic/transports/stdio), all messages logged to stderr (standard error) will be captured by the host application automatically. <Warning> Local MCP servers should not log messages to stdout (s… MCP Inspector Model Context Protocol · in the page docs/2026-07-28/tools/inspector …g:** `--web` (default), `--cli`, or `--tui`. At most one; passing two errors with `Specify at most one of --web, --cli, or --tui.` 2. **`-h` / `--help`.** Everything else (`--catalog`, `--config`, `-… Authorization Model Context Protocol · in the page docs/2026-07-28/tools/inspector/authorization …e over plaintext `http`, so a non-loopback host is rejected with an error and there is no flag to override that. If your browser runs on a different machine, forward the callback port to it; `--… CLI client Model Context Protocol · in the page docs/2026-07-28/tools/inspector/cli …dable UI resource, malformed `resourceUri`) is reported in a `resourceError` field rather than aborting, so one bad tool never kills a whole listing. <Note> `tools/list --app-info` always emits NDJ… Configuration and flags Model Context Protocol · in the page docs/2026-07-28/tools/inspector/configuration …seeded (see below). | **Errors.** | | **Default** | `~/.mcp-inspector/mcp.json`, or the `MCP_C…