# Graph URL: https://docs.hanzo.ai/docs/mcp-tools/graph > graph: 14 operations. Also for this capability: [API](https://docs.hanzo.ai/docs/openapi/graph) · [CLI](https://docs.hanzo.ai/docs/cli/graph) · **MCP** · [SDKs](https://docs.hanzo.ai/docs/sdks) graph: 14 operations. Name one in "op" and pass that operation's own arguments in "input". describe returns an operation's input schema. | | | | ------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Tool** | `graph` | | **Address** | `https://api.hanzo.ai/v1/mcp` | | **Method** | `tools/call` (JSON-RPC 2.0) | | **Arguments** | 2, 1 required | | **Operation** | `POST /v1/graph/answer` · `POST /v1/graph` · `POST /v1/graph/communities` · `POST /v1/graph/derive` · `POST /v1/graph/diff` · `POST /v1/graph/erase` · `POST /v1/graph/extract` · `POST /v1/graph/ingest` · `POST /v1/graph/neighbors` · `POST /v1/graph/path` · `GET /v1/graph` · `POST /v1/graph/resolve` · `GET /v1/graph/search` · `GET /v1/graph/vocabulary` | | **Product** | [graph](https://docs.hanzo.ai/docs/openapi/graph) | ## Arguments | Field | Type | Required | Default | Values | Description | | ------- | -------- | -------- | ------- | ------ | --------------------------- | | `input` | `object` | — | — | — | arguments for the chosen op | | `op` | `string` | **yes** | — | — | — | `tools/list` declares a type, a description, which fields are required and an enumerated value set for each field and nothing further, and every column above is MCP's own. This tool takes an operation name and that operation's arguments, so what the document constrains is what goes inside `input`, field by field, on the operation you name — ask `describe` for that. A `—` means MCP does not constrain the field. ## Call it A `tools/call` carries every argument in one flat object — nothing binds to a path or a query string. This call carries exactly the arguments the operation requires, so it is the smallest one that can run. ```bash curl -X POST https://api.hanzo.ai/v1/mcp \ -H "Authorization: Bearer $HANZO_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "graph", "arguments": { "op": "" } } }' ``` Values are the operation's own defaults and enumerated values where it declares them, and a `` where neither source declares one. `tools/list` needs no credential; `tools/call` does — called without one MCP answers HTTP 200 with a JSON-RPC result whose `isError` is set and whose text says what was missing. [How to get a key →](https://docs.hanzo.ai/docs/mcp-tools#credentials) ## The operation behind it `graph` dispatches to 14 operations. | Operation | Route | Product | Summary | | ------------------ | ---------------------------- | ------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | `graphAnswer` | `POST /v1/graph/answer` | [graph](https://docs.hanzo.ai/docs/openapi/graph) | Answers a question from the whole graph and cites the assertions it rests on. | | `graphAssert` | `POST /v1/graph` | [graph](https://docs.hanzo.ai/docs/openapi/graph) | Records a batch of assertions and counts what became of each. | | `graphCommunities` | `POST /v1/graph/communities` | [graph](https://docs.hanzo.ai/docs/openapi/graph) | Partitions the edge graph into sets of entities more densely connected to each other than to the rest. | | `graphDerive` | `POST /v1/graph/derive` | [graph](https://docs.hanzo.ai/docs/openapi/graph) | Concludes what the organization's rules derive from the graph, with a proof for every conclusion: the rule, and each support as the assertion in force it rests on or as the derived atom it is. | | `graphDiff` | `POST /v1/graph/diff` | [graph](https://docs.hanzo.ai/docs/openapi/graph) | Reports what came into force, was superseded and was retracted between two points. | | `graphErase` | `POST /v1/graph/erase` | [graph](https://docs.hanzo.ai/docs/openapi/graph) | Removes every assertion that names an entity and returns a receipt. | | `graphExtract` | `POST /v1/graph/extract` | [graph](https://docs.hanzo.ai/docs/openapi/graph) | Reads the relations a source states and returns them, recording nothing. | | `graphIngest` | `POST /v1/graph/ingest` | [graph](https://docs.hanzo.ai/docs/openapi/graph) | Reads a source and records what it states, through the same admission as assert. | | `graphNeighbors` | `POST /v1/graph/neighbors` | [graph](https://docs.hanzo.ai/docs/openapi/graph) | Walks the in-force edges from a set of seeds and lists every entity reached, bounded. | | `graphPath` | `POST /v1/graph/path` | [graph](https://docs.hanzo.ai/docs/openapi/graph) | Finds the shortest chain of in-force edges from one entity to another. | | `graphRead` | `GET /v1/graph` | [graph](https://docs.hanzo.ai/docs/openapi/graph) | Lists the assertions recorded, every version, oldest first. | | `graphResolve` | `POST /v1/graph/resolve` | [graph](https://docs.hanzo.ai/docs/openapi/graph) | Answers what holds for one entity and relation at a point, winner first, with every weaker account that disagreed. | | `graphSearch` | `GET /v1/graph/search` | [graph](https://docs.hanzo.ai/docs/openapi/graph) | Finds assertions by their words, where read finds them by their keys, best match first. | | `graphVocabulary` | `GET /v1/graph/vocabulary` | [graph](https://docs.hanzo.ai/docs/openapi/graph) | Lists the relations in use, the schema declared for them and the rule that settles a conflict. | The same capability over plain HTTP is in the [graph API reference](https://docs.hanzo.ai/docs/openapi/graph), on `https://api.hanzo.ai`. --- [All 120 tools](https://docs.hanzo.ai/docs/mcp-tools/all-tools) · [MCP](https://docs.hanzo.ai/docs/mcp-tools) · [API reference](https://docs.hanzo.ai/docs/openapi) Generated from `tools/list` on `https://api.hanzo.ai/v1/mcp` — 120 tools captured 2026-09-30.