# Probe Provenance

The Phase 2A probes are original isolated capability microkernels. They do not
contain the SageAttention mainloop or implement attention.

The inline MMA operand signatures are derived from SageAttention 2.2.0
`csrc/mma.cuh` at commit `d1a57a546c3d395b1ffcbeecc66d81db76f3b4b5`.
That file is Apache-2.0 and itself records adaptation from FlashInfer 0.1.5.
The local probe retains the required attribution in its source header.

Reference:

- https://github.com/thu-ml/SageAttention/blob/d1a57a546c3d395b1ffcbeecc66d81db76f3b4b5/csrc/mma.cuh
- https://github.com/thu-ml/SageAttention/blob/d1a57a546c3d395b1ffcbeecc66d81db76f3b4b5/LICENSE

No CUTLASS, SageAttention, FlashAttention, or Sol source is copied into the
Vortex backend. Production remains unchanged.