bug(cli/mcp): add_code_to_graph declares a graph_name input but the handler ignores it — repos silently land in the default graph #1558

tool_definitions.py:25 declares graph_name as an input to add_code_to_graph:

"graph_name": _GRAPH_NAME_PROP

but the handler never reads it — tools/handlers/indexing_handlers.py:12-21:

def add_code_to_graph(graph_builder, job_manager, loop, list_repos_func, **args) -> Dict[str, Any]:
    path = args.get("path") or args.get("repo_path")
    is_dependency = args.get("is_dependency", False)
    ...

Only path, repo_path and is_dependency are consulted. graph_name is silently discarded.

Impact

FalkorDB is the default backend and is multi-graph — list_graphs is an exposed tool (tool_definitions.py:386) and query handlers honour graph_name (handlers/query_handlers.py:46). So an agent can legitimately do:

add_code_to_graph(path="/repos/service-a", graph_name="service-a")

and reasonably believe the repository landed in service-a. It lands in the default graph instead, with no warning. A later analyze_code_relationships(..., graph_name="service-a") then finds nothing, and the failure looks like "indexing didn't work" rather than "the argument was ignored".

This is the write-side counterpart to #1531, where graph_name is accepted but clobbered for two query types.

Related, same shape

api/router.py:99-101 discards branch, repo_name and force from IndexRequest:

args = {"path": request.path}   # repo_name/branch/force are not supported

IndexRequest.branch is declared at api/schemas.py:8, so the HTTP API advertises a field it drops. (Relevant to #736, which asks for per-branch indexes.)

Suggested fix

Either honour graph_name in the handler by routing the writer to db_manager.get_driver(graph_name), or remove it from the tool schema until it is implemented. Advertising an argument that is silently ignored is worse than not offering it — the same applies to the three discarded IndexRequest fields.

_{Found during backlog triage while verifying #736. Verified by reading the schema against the handler.}