inspect-tag

Diagnose NFC tag hardware properties and memory layout non-destructively.

Updated Apr 30, 2026

Search Tags:#inspect #memory-layout #nfc #ntag21x #mifare #lock-state #hardware-diagnostics

Ready to run

npx skills add https://github.com/danielrosehill/Claude-NFC-Ops-Plugin --skill inspect-tag

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: inspect-tag
Source: https://github.com/danielrosehill/Claude-NFC-Ops-Plugin/tree/main/skills/inspect-tag
Command: npx skills add https://github.com/danielrosehill/Claude-NFC-Ops-Plugin --skill inspect-tag

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Deep inspection of an NFC tag's hardware properties, memory layout, lock state, and capacity. Useful for diagnosing why writes fail or whether a tag is locked/read-only.

Core Features & Use Cases

Identify tag type and UID using nfc-list to verify compatibility with write or password-protection flows.
Assess memory layout and capacity for NTAG21x and MIFARE Classic to plan safe data writes.
Analyze LOCK bits, CC bytes, AUTH0 (where present) and sector/trailer access bits to guide password protection decisions.
Non-destructive read-only reporting to troubleshoot issues without modifying the tag.
Use-case guidance for pre-write diagnostics and validation before write operations.

Quick Start

Present a tag to the reader and run the inspection to produce a diagnostic report of its hardware properties and memory layout.

Frequently Asked Questions about inspect-tag

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I diagnose why an NFC tag write is failing?▼

Diagnosing a failed NFC tag write requires inspecting the hardware properties, memory layout, and lock state. This Skill uses nfc-list and tag-specific tools to non-destructively report UID, capacity, and lock bits to identify if the tag is read-only or incompatible.

What is the best way to check an NFC tag's lock state and capacity before writing data?▼

Checking an NFC tag's lock state and capacity involves analyzing LOCK bits and CC bytes non-destructively. This Skill reads these hardware properties using nfc-mfultralight info for NTAG21x and nfc-mfclassic info for MIFARE to verify safe data write planning.

Does this NFC diagnostic process support both NTAG21x and MIFARE Classic tags?▼

Yes, this NFC diagnostic process supports both NTAG21x and MIFARE Classic tags. It leverages nfc-mfultralight info for NTAG21x and nfc-mfclassic info for MIFARE to accurately report tag type, memory layout, and sector trailer access bits.

Can I read NFC tag NDEF content without modifying or wiping the existing data?▼

Reading NFC tag NDEF content without modification is possible through non-destructive reporting. This Skill performs read-only diagnostics to assess current NDEF content, UID, and AUTH0 status without altering the tag's hardware state or stored data.

How do I verify NFC tag compatibility before applying password protection?▼

Verifying NFC tag compatibility before password protection requires assessing AUTH0, LOCK bits, and sector trailer access bits. This Skill inspects these hardware properties to guide password protection decisions and ensure the tag supports the required security flow.