{
  "title": "Eml viewer",
  "human_url": "https://happytails.ai/en/email-tools/eml-viewer/",
  "agent_url": "https://happytails.ai/agents/en/email-tools/eml-viewer/",
  "language": "en",
  "markdown_url": "https://happytails.ai/en/email-tools/eml-viewer.md",
  "content": "Eml viewer\nLocal MIME parsing with disabled remote assets and attachment listing..\nUseful next steps\nEmail header analyzer\nLocal parsing of hops and authentication results.\nHow to use Eml viewer\nChoose a file in EML.\nReview the settings, then choose Run Eml viewer.\nReview the result, then use Copy result or a download link when available.\nWorking with eml viewer\nEmail tools can inspect addresses, message headers, templates and domain configuration. These tasks answer different questions: a syntactically valid address is not the same as a mailbox that exists, and a configured domain is not a guarantee of inbox placement.\nCommon questions\nDoes address validation prove a mailbox exists?\nSyntax checks can catch formatting mistakes but cannot prove that a person receives mail at an address. Server-side checks can also be inconclusive.\nDo authentication records guarantee inbox delivery?\nNo. Authentication is one signal among several. Sending behavior, recipient engagement and filtering rules also affect what happens to a message.\nContinue your workflow:\nEmail header analyzer\n.",
  "content_format": "text/plain",
  "visibility": "public",
  "links": [
    {
      "name": "Email header analyzer Local parsing of hops and authentication results.",
      "url": "https://happytails.ai/en/email-tools/email-header-analyzer/"
    }
  ],
  "tool": {
    "id": "eml-viewer",
    "category": "email-tools",
    "built": true,
    "requirements": "Local MIME parsing with disabled remote assets and attachment listing.",
    "implementation": {
      "fields": [],
      "files": true,
      "accept": ".eml",
      "note": "Reads the message locally. HTML is shown as source; remote images and scripts are never loaded.",
      "experience": {
        "automatic": false,
        "single": false,
        "label": "Your text",
        "placeholder": "Type or paste your input…",
        "help": "Up to 1,000,000 characters. Review the settings before running.",
        "action": null
      },
      "mode": "explicit",
      "interactive": false
    },
    "execution": "POST /api/v1/tools/eml-viewer/run",
    "api": {
      "id": "eml-viewer",
      "name": "Eml viewer",
      "category": "email-tools",
      "description": "Local MIME parsing with disabled remote assets and attachment listing.",
      "notes": "Reads the message locally. HTML is shown as source; remote images and scripts are never loaded.",
      "human_path": "/en/email-tools/eml-viewer/",
      "method": "POST",
      "endpoint": "/api/v1/tools/eml-viewer/run",
      "schema_url": "/api/v1/tools/eml-viewer",
      "input_schema": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "input": {
            "type": "string",
            "maxLength": 1000000,
            "default": "",
            "description": "Plain text input. File tools use files instead unless otherwise documented."
          },
          "options": {
            "type": "object",
            "additionalProperties": false,
            "properties": {}
          },
          "files": {
            "type": "array",
            "maxItems": 1,
            "items": {
              "type": "object",
              "required": [
                "name",
                "base64"
              ],
              "additionalProperties": false,
              "properties": {
                "name": {
                  "type": "string",
                  "maxLength": 200,
                  "description": "Filename only, no path."
                },
                "mime": {
                  "type": "string",
                  "maxLength": 150
                },
                "bytes": {
                  "type": "integer",
                  "minimum": 0,
                  "description": "Optional decoded byte count; must match content if supplied."
                },
                "base64": {
                  "type": "string",
                  "contentEncoding": "base64",
                  "description": "File bytes as padded base64. Use the tool-specific limits.files_bytes value for the total decoded input size."
                }
              }
            }
          }
        }
      },
      "output_schema": {
        "type": "object",
        "required": [
          "tool",
          "result"
        ],
        "properties": {
          "tool": {
            "type": "string"
          },
          "result": {
            "type": "object",
            "required": [
              "text",
              "files"
            ],
            "properties": {
              "text": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "data": {
                "description": "Parsed JSON when the textual result is JSON."
              },
              "name": {
                "type": "string"
              },
              "mime": {
                "type": "string"
              },
              "files": {
                "type": "array",
                "items": {
                  "type": "object",
                  "required": [
                    "name",
                    "mime",
                    "bytes",
                    "base64"
                  ],
                  "properties": {
                    "name": {
                      "type": "string"
                    },
                    "mime": {
                      "type": "string"
                    },
                    "bytes": {
                      "type": "integer"
                    },
                    "base64": {
                      "type": "string",
                      "contentEncoding": "base64"
                    }
                  }
                }
              }
            }
          }
        }
      },
      "processing": "Server; same transformation code as browser tools",
      "limits": {
        "request_bytes": 8388608,
        "input_characters": 1000000,
        "files_bytes": 5242880,
        "max_files": 1,
        "timeout_seconds": 12
      }
    },
    "agent_processing": "Server; same transformation code as browser tools",
    "browser_agent": {
      "supported": true,
      "name": "run_current_tool",
      "discovery": "WebMCP on the human page in a supporting browser",
      "verification": "See audit/API-AUDIT.md; availability is not verification"
    }
  },
  "markdown": "# Eml viewer\n\n- Human page: https://happytails.ai/en/email-tools/eml-viewer/\n- Markdown: https://happytails.ai/en/email-tools/eml-viewer.md\n- Structured JSON: https://happytails.ai/agents/en/email-tools/eml-viewer/index.json\n- Visibility: public\n\n## Tool capabilities\n\n| Property | Value |\n| --- | --- |\n| Tool ID | `eml-viewer` |\n| Category | email-tools |\n| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |\n| Browser execution | Use the visible action or interactive controls. |\n| Browser processing | Browser; see tool notes for network behavior. |\n| HTTP API | /api/v1/tools/eml-viewer/run |\n| Browser-agent interface | run_current_tool |\n\n### Implementation notes\n\nReads the message locally. HTML is shown as source; remote images and scripts are never loaded.\n\n### Inputs and settings\n\nText input: Your text.\n\nExample or placeholder shown in the interface (not a validated fixture):\n\n```text\nType or paste your input…\n```\n\nUp to 1,000,000 characters. Review the settings before running.\n\nAccepted browser files: `.eml`. Choose one file.\n\nNo additional settings are declared for this tool.\n\n### HTTP contract\n\nAPI calls process supplied data on the server. The website origin is `https://happytails.ai`. Server API hosting is not connected on the public website yet. Use your local server origin to test these requests.\n\n```http\nPOST https://happytails.ai/api/v1/tools/eml-viewer/run\nContent-Type: application/json\n```\n\n[Detailed operation reference](https://happytails.ai/en/api/tools/eml-viewer.md) · [Shared API guide](https://happytails.ai/en/api.md)\n\n#### Limits\n\n| Limit | Value |\n| --- | --- |\n| request_bytes | 8388608 |\n| input_characters | 1000000 |\n| files_bytes | 5242880 |\n| max_files | 1 |\n| timeout_seconds | 12 |\n\n#### Complete input schema\n\n```json\n{\n  \"type\": \"object\",\n  \"additionalProperties\": false,\n  \"properties\": {\n    \"input\": {\n      \"type\": \"string\",\n      \"maxLength\": 1000000,\n      \"default\": \"\",\n      \"description\": \"Plain text input. File tools use files instead unless otherwise documented.\"\n    },\n    \"options\": {\n      \"type\": \"object\",\n      \"additionalProperties\": false,\n      \"properties\": {}\n    },\n    \"files\": {\n      \"type\": \"array\",\n      \"maxItems\": 1,\n      \"items\": {\n        \"type\": \"object\",\n        \"required\": [\n          \"name\",\n          \"base64\"\n        ],\n        \"additionalProperties\": false,\n        \"properties\": {\n          \"name\": {\n            \"type\": \"string\",\n            \"maxLength\": 200,\n            \"description\": \"Filename only, no path.\"\n          },\n          \"mime\": {\n            \"type\": \"string\",\n            \"maxLength\": 150\n          },\n          \"bytes\": {\n            \"type\": \"integer\",\n            \"minimum\": 0,\n            \"description\": \"Optional decoded byte count; must match content if supplied.\"\n          },\n          \"base64\": {\n            \"type\": \"string\",\n            \"contentEncoding\": \"base64\",\n            \"description\": \"File bytes as padded base64. Use the tool-specific limits.files_bytes value for the total decoded input size.\"\n          }\n        }\n      }\n    }\n  }\n}\n```\n\n#### Complete output schema\n\n```json\n{\n  \"type\": \"object\",\n  \"required\": [\n    \"tool\",\n    \"result\"\n  ],\n  \"properties\": {\n    \"tool\": {\n      \"type\": \"string\"\n    },\n    \"result\": {\n      \"type\": \"object\",\n      \"required\": [\n        \"text\",\n        \"files\"\n      ],\n      \"properties\": {\n        \"text\": {\n          \"type\": [\n            \"string\",\n            \"null\"\n          ]\n        },\n        \"data\": {\n          \"description\": \"Parsed JSON when the textual result is JSON.\"\n        },\n        \"name\": {\n          \"type\": \"string\"\n        },\n        \"mime\": {\n          \"type\": \"string\"\n        },\n        \"files\": {\n          \"type\": \"array\",\n          \"items\": {\n            \"type\": \"object\",\n            \"required\": [\n              \"name\",\n              \"mime\",\n              \"bytes\",\n              \"base64\"\n            ],\n            \"properties\": {\n              \"name\": {\n                \"type\": \"string\"\n              },\n              \"mime\": {\n                \"type\": \"string\"\n              },\n              \"bytes\": {\n                \"type\": \"integer\"\n              },\n              \"base64\": {\n                \"type\": \"string\",\n                \"contentEncoding\": \"base64\"\n              }\n            }\n          }\n        }\n      }\n    }\n  }\n}\n```\n\n#### Error and retry handling\n\nFailures return a non-200 status and `error.code` plus `error.message`. Correct invalid input before retrying; retry server-busy responses with bounded backoff. Returned files contain Base64 data, not persistent download URLs. Decode and inspect the output before treating conversion as successful. See the shared API guide for the complete status and timeout rules.\n\n### Browser-agent workflow\n\n1. Open the human page in a browser that supports WebMCP.\n2. Discover the interface exposed by that page; use its actual schema.\n3. Select files on the page first when the tool requires files.\n4. Call `run_current_tool` with valid input and settings.\n5. Inspect the returned result or error and the displayed output. Retrieve files from the displayed download links.\n\nCalls do not automatically copy or download results. Browser permissions still apply. Interface availability alone is not proof of successful execution.\n\n### Planning specification\n\nLocal MIME parsing with disabled remote assets and attachment listing.\n\nThis describes intended requirements. Use the implementation notes, interface schema and observed output to determine current support.\n\n### Complete machine-readable capability record\n\n```json\n{\n  \"id\": \"eml-viewer\",\n  \"category\": \"email-tools\",\n  \"built\": true,\n  \"requirements\": \"Local MIME parsing with disabled remote assets and attachment listing.\",\n  \"implementation\": {\n    \"fields\": [],\n    \"files\": true,\n    \"accept\": \".eml\",\n    \"note\": \"Reads the message locally. HTML is shown as source; remote images and scripts are never loaded.\",\n    \"experience\": {\n      \"automatic\": false,\n      \"single\": false,\n      \"label\": \"Your text\",\n      \"placeholder\": \"Type or paste your input…\",\n      \"help\": \"Up to 1,000,000 characters. Review the settings before running.\",\n      \"action\": null\n    },\n    \"mode\": \"explicit\",\n    \"interactive\": false\n  },\n  \"execution\": \"POST /api/v1/tools/eml-viewer/run\",\n  \"api\": {\n    \"id\": \"eml-viewer\",\n    \"name\": \"Eml viewer\",\n    \"category\": \"email-tools\",\n    \"description\": \"Local MIME parsing with disabled remote assets and attachment listing.\",\n    \"notes\": \"Reads the message locally. HTML is shown as source; remote images and scripts are never loaded.\",\n    \"human_path\": \"/en/email-tools/eml-viewer/\",\n    \"method\": \"POST\",\n    \"endpoint\": \"/api/v1/tools/eml-viewer/run\",\n    \"schema_url\": \"/api/v1/tools/eml-viewer\",\n    \"input_schema\": {\n      \"type\": \"object\",\n      \"additionalProperties\": false,\n      \"properties\": {\n        \"input\": {\n          \"type\": \"string\",\n          \"maxLength\": 1000000,\n          \"default\": \"\",\n          \"description\": \"Plain text input. File tools use files instead unless otherwise documented.\"\n        },\n        \"options\": {\n          \"type\": \"object\",\n          \"additionalProperties\": false,\n          \"properties\": {}\n        },\n        \"files\": {\n          \"type\": \"array\",\n          \"maxItems\": 1,\n          \"items\": {\n            \"type\": \"object\",\n            \"required\": [\n              \"name\",\n              \"base64\"\n            ],\n            \"additionalProperties\": false,\n            \"properties\": {\n              \"name\": {\n                \"type\": \"string\",\n                \"maxLength\": 200,\n                \"description\": \"Filename only, no path.\"\n              },\n              \"mime\": {\n                \"type\": \"string\",\n                \"maxLength\": 150\n              },\n              \"bytes\": {\n                \"type\": \"integer\",\n                \"minimum\": 0,\n                \"description\": \"Optional decoded byte count; must match content if supplied.\"\n              },\n              \"base64\": {\n                \"type\": \"string\",\n                \"contentEncoding\": \"base64\",\n                \"description\": \"File bytes as padded base64. Use the tool-specific limits.files_bytes value for the total decoded input size.\"\n              }\n            }\n          }\n        }\n      }\n    },\n    \"output_schema\": {\n      \"type\": \"object\",\n      \"required\": [\n        \"tool\",\n        \"result\"\n      ],\n      \"properties\": {\n        \"tool\": {\n          \"type\": \"string\"\n        },\n        \"result\": {\n          \"type\": \"object\",\n          \"required\": [\n            \"text\",\n            \"files\"\n          ],\n          \"properties\": {\n            \"text\": {\n              \"type\": [\n                \"string\",\n                \"null\"\n              ]\n            },\n            \"data\": {\n              \"description\": \"Parsed JSON when the textual result is JSON.\"\n            },\n            \"name\": {\n              \"type\": \"string\"\n            },\n            \"mime\": {\n              \"type\": \"string\"\n            },\n            \"files\": {\n              \"type\": \"array\",\n              \"items\": {\n                \"type\": \"object\",\n                \"required\": [\n                  \"name\",\n                  \"mime\",\n                  \"bytes\",\n                  \"base64\"\n                ],\n                \"properties\": {\n                  \"name\": {\n                    \"type\": \"string\"\n                  },\n                  \"mime\": {\n                    \"type\": \"string\"\n                  },\n                  \"bytes\": {\n                    \"type\": \"integer\"\n                  },\n                  \"base64\": {\n                    \"type\": \"string\",\n                    \"contentEncoding\": \"base64\"\n                  }\n                }\n              }\n            }\n          }\n        }\n      }\n    },\n    \"processing\": \"Server; same transformation code as browser tools\",\n    \"limits\": {\n      \"request_bytes\": 8388608,\n      \"input_characters\": 1000000,\n      \"files_bytes\": 5242880,\n      \"max_files\": 1,\n      \"timeout_seconds\": 12\n    }\n  },\n  \"agent_processing\": \"Server; same transformation code as browser tools\",\n  \"browser_agent\": {\n    \"supported\": true,\n    \"name\": \"run_current_tool\",\n    \"discovery\": \"WebMCP on the human page in a supporting browser\",\n    \"verification\": \"See audit/API-AUDIT.md; availability is not verification\"\n  }\n}\n```\n\n## Page guide\n\nLocal MIME parsing with disabled remote assets and attachment listing..\n\n## Useful next steps\n\n- [Email header analyzer](https://happytails.ai/en/email-tools/email-header-analyzer/): Local parsing of hops and authentication results. ([Markdown](https://happytails.ai/en/email-tools/email-header-analyzer.md))\n\n## How to use Eml viewer\n\n1. Choose a file in EML.\n2. Review the settings, then choose Run Eml viewer.\n3. Review the result, then use Copy result or a download link when available.\n\n## Working with eml viewer\n\nEmail tools can inspect addresses, message headers, templates and domain configuration. These tasks answer different questions: a syntactically valid address is not the same as a mailbox that exists, and a configured domain is not a guarantee of inbox placement.\n\n## Common questions\n\n### Does address validation prove a mailbox exists?\n\nSyntax checks can catch formatting mistakes but cannot prove that a person receives mail at an address. Server-side checks can also be inconclusive.\n\n### Do authentication records guarantee inbox delivery?\n\nNo. Authentication is one signal among several. Sending behavior, recipient engagement and filtering rules also affect what happens to a message.\n\nContinue your workflow: [Email header analyzer](https://happytails.ai/en/email-tools/email-header-analyzer/).\n"
}