carrot-mcp-nfc 0.1.1

Carrot MCP NFC Server - nfcscript wrapper

carrot-mcp-nfc

Carrot MCP NFC Server — wraps nfcscript for NFC reader communication via MCP.

Tools

Tool	Description
version	Get server version info
list_readers	List available reader types and transports
connect	Connect to NFC reader (port, reader_type, transport)
disconnect	Disconnect from reader
find	Find and activate an NFC card (returns uid, atq, sak)
transceive	Raw frame exchange with bit-level control (InCommunicateThru)
exchange	Data exchange with auto CRC (InDataExchange)
reqa	ISO14443-A REQA (7-bit short frame)
wupa	ISO14443-A WUPA (7-bit short frame)
halt	ISO14443-A HALT
select	ISO14443-A SELECT
anticoll	ISO14443-A ANTICOLL (anti-collision)
field_on / field_off	Control RF field
script	Execute a sequence of NFC operations (see below)
trace_get	Get trace log entries (supports level/layer filtering)
trace_clear	Clear trace log buffer

Supported Readers

• pn532 — PN532 HSU (default)
• clrc663 — CLRC663 UART

Use list_readers to see all registered types at runtime.

Supported Transports

• serial — Serial/UART (default)

Use list_readers to see all registered types at runtime.

Usage

uv run carrot-mcp nfc

Script Tool

script executes a sequence of NFC operations. Each step is a dict with an op field:

Op	Params	Description
transceive	data (hex), tx_crc?, rx_crc?, last_tx_bits?	Raw frame exchange
exchange	data (hex)	Auto-CRC data exchange
find	low_level? (bool)	Find and activate card
reqa	—	REQA (7-bit short frame)
wupa	—	WUPA (7-bit short frame)
halt	—	HALT command
select	cl_level (int), uid (hex)	SELECT command
anticoll	cl_level?, nvb?, uid_prefix? (hex)	Anti-collision
field_on	—	Turn on RF field
field_off	—	Turn off RF field
wait	ms (int)	Wait for N milliseconds

Expect Matching

transceive and exchange steps support expect and on_mismatch:

[
  {"op": "transceive", "data": "6007", "expect": "AA55", "on_mismatch": "stop"}
]

• expect (hex): Expected response data for matching.
• on_mismatch: "stop" (default) aborts the script on mismatch; "continue" logs the mismatch but proceeds.

The script stops on the first error or on_mismatch: "stop".

Example MCP Call Sequence

list_readers()
connect(port="COM20", reader_type="pn532")
find()
transceive(data="6007", last_tx_bits=7, tx_crc=false, rx_crc=false)
exchange(data="6007")
reqa()
wupa()
select(cl_level=1, uid="04AABBCCDD77")
anticoll(cl_level=1)
halt()
field_off()
trace_get()
trace_clear()
disconnect()