All clients
fx
CLIVercel Labs
MCP
SupportedGlobal MCP profiles and explicitly trusted project servers.
Verified 2026-09-07Docs
Transportsstdiohttpsse
Authheadersenv-secretsoauth
Config files
| Path | Scope | Format | Key |
|---|---|---|---|
~/.fx/mcp.json | Global | json | mcp |
.mcp.jsonClaude-compatible project format; approval required before connection. | Project | json | mcpServers |
Fields
| Field | Type | Description |
|---|---|---|
type | "local" | "http" | "sse" | Transport selector. |
command | string | string[] | Local executable; arrays include arguments. |
args | string[] | Arguments with string commands. |
environment | record<string, string> | Child environment; env is an alias. |
url | string | Required for remote connections. |
headers | record<string, string> | Static headers; literal Authorization is rejected. |
header_env | record<string, string> | Header names mapped to environment variable names. |
bearer_token_env | string | Environment variable containing a bearer token. |
oauth | object | OAuth configuration. |
enabled | boolean | Enable the server. |
required | boolean | Wait for startup; global only. |
startup_timeout_ms | number | Positive startup timeout; default 30000 ms. |
operation_timeout_ms | number | Positive operation timeout; default 60000 ms. |
- •add-mcp 2.3.1 installs only the global profile; native fx also reads project .mcp.json.
- •Global mcpServers is a compatibility alias for mcp. Project files require mcpServers.
- •Project strings expand environment templates after trust approval. Global strings remain literal.
Skills
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Rules
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Hooks
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Commands
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Settings
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Search, browser & identification
Findings apply to the tool and conditions listed. Each known claim links to its evidence.
Behavior has not been researched for this client. Unknown does not mean unsupported.