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McpContext

faucet_cli::mcp

Struct McpContext 

Source 
pub struct McpContext {
    pub auth: AuthCatalog,
    pub allow_mutations: bool,
    pub allow_config_execution: bool,
    pub templates: Option<TemplateStore>,
}
Available on crate feature mcp only.
Expand description

Everything a tool handler needs, independent of transport.

Fields§

§auth: AuthCatalog

Shared auth providers (for preview/run_pipeline connector builds).

§allow_mutations: bool

Whether mutating tools (run_pipeline, register_template, run_template) are exposed and callable.

§allow_config_execution: bool

Whether tools that act on a caller-supplied config — validate_config and preview — are exposed and callable.

These are read-only in the sense that they write nothing, but they are not harmless: preview constructs the connector the caller describes and returns its records, and both resolve ${env:} / ${file:} / ${secret:} against the server’s environment and filesystem. On the HTTP transport that is server-side file read and outbound network reach, so it requires the same scope as POST /v1/doctor (operator+) rather than the schema-read scope the route’s baseline uses (#456 C4). The stdio transport runs as the local user and sets this true.

§templates: Option<TemplateStore>
Available on crate feature templates only.

The pipeline template registry (#444), when one is wired: faucet serve --mcp passes its own --history backend; faucet mcp needs --template-store. Absent = the template tools are not advertised at all, so an agent never sees a tool it cannot use.

Implementations§

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impl McpContext

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pub fn new(auth: AuthCatalog, allow_mutations: bool) -> Self

A context for a local caller (the faucet mcp stdio transport), which already runs with the user’s own privileges: config-executing tools are enabled, mutations follow allow_mutations.

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pub fn with_config_execution(self, allow: bool) -> Self

Set whether validate_config / preview are available. The HTTP transport passes the caller’s RBAC decision here.

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pub fn with_templates(self, store: TemplateStore) -> Self

Available on crate feature templates only.

Attach a template registry, enabling the template tools.

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