# filemorph

filemorph is a small local bridge to the hosted
FileTypeConverters MCP server, which converts files
between 44 formats spanning documents, spreadsheets,
images, ebooks and subtitles. You hand it a file either
as base64 content or as a public https URL, pick a
target format, and get the converted output back —
small text outputs inline, larger or binary outputs as
base64 plus a download URL.

The bridge converts nothing itself and keeps no files.
It serves the upstream server's tool list locally,
exactly as captured from the live endpoint, and forwards
each tool call upstream, returning the result untouched.
Two tools read reference data, one checks whether a
conversion pair is supported, one submits a conversion,
and one fetches a conversion submitted earlier.

## Tools

- `list_formats` — every format the converter can read
  or write, with its id, name, extensions and family.
  The ids are what the other tools take as `from` and
  `to`. No arguments.
- `check_conversion` — whether one format can be
  converted to another, checked before any file is sent.
  Reports the engine, whether AI Deep Read is needed,
  the options the pair accepts, and alternatives when
  the pair is not supported. Formats may be given as ids
  (`docx`), extensions (`jpeg`) or common names (`word`,
  `excel`). Required: `from`, `to`.
- `list_conversions` — the supported target formats for
  a source format, or every source that can produce a
  given target, as compact `{from,to,slug,engine,mode}`
  rows. Optional: `from`, `to`.
- `convert_file` — submit a file for conversion. The
  content goes in as `base64` or as a public https
  `url`; `from` is optional when the filename or URL
  carries an extension. Text outputs (Markdown, CSV,
  JSON, HTML…) up to 200 KB come back inline as `text`;
  other outputs come back as `base64` plus a
  `downloadUrl` that accepts the same bearer token.
  Files are capped at 10 MB. Setting `deepRead: true`
  reads scans, photos and handwriting with AI Deep Read
  (1 credit per page). Required: `to`. Optional:
  `filename`, `base64`, `url`, `from`, `options`,
  `deepRead`.
- `get_conversion` — a conversion submitted earlier,
  fetched by id: its status, any warnings, and the
  output (inline text or base64) while it is still
  retained. Required: `id`.

## Configuration

- `FILETYPECONVERTERS_MCP_URL` (optional) — override
  the upstream endpoint. Defaults to
  `https://filetypeconverters.com/api/mcp`.
  (The override hook is this rebuild's own labelled
  reconstruction.)
- `FILETYPECONVERTERS_API_KEY` (optional) — when set,
  every upstream request carries an
  `Authorization: Bearer <key>` header. When it is not
  set, no auth header is sent. (This forwarding is also
  a labelled reconstruction; the original surface was
  captured keyless, though the registry record declares
  an Authorization header required.)

### Forwarding mechanics

On the first tool call the client opens a streamable
HTTP session with the upstream: a JSON-RPC `initialize`
request (protocolVersion `2025-03-26`, clientInfo name
`filemorph`), then a `notifications/initialized`
notification, then the `tools/call` request carrying
the caller's arguments unchanged. When the upstream
answers `initialize` with an `Mcp-Session-Id` header,
that value rides on every later request of the session,
which is reused for the life of the process. Replies
may arrive as plain JSON or as server-sent events;
both are read.

Successful upstream results pass through verbatim,
including any `isError` flag the upstream sets.
Failures — a JSON-RPC error, a non-2xx status, an
unreadable response, or a request that cannot be
completed — come back as an `isError` result whose
text starts with `filemorph error:` (this rendering
is this rebuild's own labelled reconstruction).

## CLI

Each tool is also a subcommand taking one JSON argument
string (omit it for tools that take none):

```bash
npx @reneturcios/filemorph list_formats
npx @reneturcios/filemorph check_conversion '{"from":"pdf","to":"docx"}'
npx @reneturcios/filemorph convert_file '{"to":"md","filename":"report.pdf","base64":"..."}'
npx @reneturcios/filemorph get_conversion '{"id":"conv-42"}'
npx @reneturcios/filemorph --version
```

Exit codes: `0` on success, `1` on an `isError`
result, `2` on a usage error.

## MCP server

```bash
npx -y @reneturcios/filemorph mcp
```

MCP client config:

```json
{
  "mcpServers": {
    "filemorph": {
      "command": "npx",
      "args": ["-y", "@reneturcios/filemorph", "mcp"]
    }
  }
}
```

## Docker

```bash
docker run -i ghcr.io/cloudcorprecords/filemorph
docker run --rm ghcr.io/cloudcorprecords/filemorph --version
```

The container's default command is `mcp`, so the first
form is a stdio MCP server; any other arguments reach
the CLI normally.

## Development

```bash
npm install
npm run build
npm test
npm run dev
```

The test suite runs entirely against a stubbed
JSON-RPC upstream — no live network calls.

## License

MIT — see `LICENSE`.