# `ConduitMcp.Errors`
[🔗](https://github.com/nyo16/conduit_mcp/blob/v0.10.1/lib/conduit_mcp/errors.ex#L1)

Standard error codes for MCP and JSON-RPC 2.0 responses.

These constants can be used with the `error/2` response helper or when
building error maps manually. All codes follow the JSON-RPC 2.0 specification
and MCP protocol extensions.

## Usage

With response helpers (DSL and Endpoint modes):

    import ConduitMcp.Errors

    error("User not found", method_not_found())
    error("Bad input", invalid_params())

Building error maps manually:

    alias ConduitMcp.Errors

    {:error, %{"code" => Errors.invalid_params(), "message" => "Missing required field"}}

## JSON-RPC 2.0 Error Codes

| Code | Constant | Meaning |
|------|----------|---------|
| `-32700` | `parse_error/0` | Invalid JSON received by the server |
| `-32600` | `invalid_request/0` | The JSON sent is not a valid Request object |
| `-32601` | `method_not_found/0` | The method does not exist or is not available |
| `-32602` | `invalid_params/0` | Invalid method parameters |
| `-32603` | `internal_error/0` | Internal JSON-RPC error |

## MCP Error Codes

| Code | Constant | Meaning |
|------|----------|---------|
| `-32000` | `server_error/0` | Generic tool/server error (default for `error/1`) |
| `-32002` | `resource_not_found/0` | The requested resource URI was not found |
| `-32004` | `task_not_ready/0` | A `tasks/result` was requested before the task finished |
| `-32800` | `request_cancelled/0` | The request was cancelled (`notifications/cancelled`) |

# `internal_error`

Internal error — unexpected server-side failure (`-32603`)

# `invalid_params`

Invalid params — parameter validation failed (`-32602`)

# `invalid_request`

Invalid request — not a valid JSON-RPC 2.0 request (`-32600`)

# `method_not_found`

Method not found — tool, prompt, or resource does not exist (`-32601`)

# `parse_error`

Parse error — invalid JSON received (`-32700`)

# `request_cancelled`

Request cancelled — client sent `notifications/cancelled` for this request (`-32800`)

# `resource_not_found`

Resource not found — the requested URI did not match any resource (`-32002`)

# `server_error`

Server error — generic tool/server error, default for `error/1` (`-32000`)

# `task_not_ready`

Task not ready — `tasks/result` requested before the task finished (`-32004`)

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*Consult [api-reference.md](api-reference.md) for complete listing*