# description
Manifest shape for a `Formatter` extension. A formatter serializes the graph (or a filtered subgraph) into a string in a declared format. The format id comes from the formatter's folder name (structure-as-truth, `<plugin>/formatters/<formatId>/index.ts`), it is NOT a manifest field. Invoked by `sm graph --format <formatId>` and `sm export`. Formatters are deterministic-only, they sit at the graph-to-string boundary and their output MUST be byte-deterministic for the same input graph (the snapshot-test suite relies on this). The `mode` field MUST NOT appear in formatter manifests. Probabilistic narrators of the graph are a valid product but they live in jobs and emit Findings, not in formatters. All formatters accept the `--filter` expression; opting out is no longer supported.

# properties.contentType.description
MIME-like hint used by the BFF when streaming formatted output over HTTP (e.g. `text/plain`, `image/svg+xml`, `application/json`). Advisory.