BoundaryML/baml · error · BridgeError

Not implemented

Error message

Not implemented: {0}

What it means

BridgeError::NotImplemented wraps a description of functionality the bridge_cffi layer does not implement yet. The requested operation is recognized but has no implementation on this code path, so the bridge refuses it explicitly rather than failing silently.

Solutions

1. Read the wrapped message to identify the unimplemented feature.
2. Upgrade the bridge_cffi native library to a version that implements the feature.
3. Use an alternative supported API for the same outcome.
4. File/track an issue with the BAML project if the feature is required.

try:
    result = bridge.operation(...)
except BridgeError as e:
    if isinstance(e.__cause__ or e, NotImplementedPath):
        fallback_to_supported_api()

When it happens

Trigger: Invoking a bridge operation or feature flag whose implementation is a stub (e.g. a media/handle operation or runtime feature not yet wired through the CFFI layer).

Common situations: Using a client SDK feature newer than the installed native bridge; calling an operation only supported in a different backend; platform-specific gaps in the prebuilt library.

Related errors

• Platform not supported
• {0}
• BAML library not found. Searched paths
• baml.panics.HostContractViolation
• call_id is already in use by an active call

AI-assisted analysis of BoundaryML/baml@bd85ce9dee (2026-09-12). Data as JSON: /api/errors/b6b441405dda16ca. Report an issue: GitHub.

Appendix: source

Thrown at baml_language/crates/bridge_cffi/src/error.rs:34

    #[error("Engine lock poisoned")]
    LockPoisoned,

    #[error("{0}")]
    Runtime(#[from] bex_project::RuntimeError),

    #[error("CallFunctionArgs.call_target must be set")]
    MissingCallTarget,

    #[error("type arguments are not supported when invoking a BAML function handle")]
    FunctionHandleTypeArgs,

    #[error("Function not found: {name}")]
    FunctionNotFound { name: String },

    #[error("Missing argument '{parameter}' for function '{function}'")]
    MissingArgument { function: String, parameter: String },

    #[error("Not implemented: {0}")]
    NotImplemented(String),

    #[error("call_id {0} is already in use by an active call")]
    DuplicateCallId(u64),

    #[error("call_id must be a nonzero uint64")]
    InvalidCallId,

    #[error("Internal error: {0}")]
    Internal(String),

    #[error("{0}")]
    Startup(String),
}

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