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# Type Alias Nemo Relay Tool Exec Next Fn

> Runtime-provided "next" callback for tool execution middleware chain. Call this from an intercept to invoke the next layer (or original function). The returned string contains a serialized `ToolExecutionResult`. `next_ctx` is borrowed and valid only until the intercept callback returns; callers must not retain it or invoke `next_fn` asynchronously. The returned string belongs to the caller and must be released with `nemo_relay_string_free`.

Generated from `cargo doc --no-deps -p nemo-relay -p nemo-relay-adaptive -p nemo-relay-pii-redaction -p nemo-relay-ffi -p nemo-relay-types -p nemo-relay-plugin -p nemo-relay-worker-proto -p nemo-relay-worker`.

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Runtime-provided "next" callback for tool execution middleware chain. Call this from an intercept to invoke the next layer (or original function). The returned string contains a serialized `ToolExecutionResult`. `next_ctx` is borrowed and valid only until the intercept callback returns; callers must not retain it or invoke `next_fn` asynchronously. The returned string belongs to the caller and must be released with `nemo_relay_string_free`.