automateyournetwork/packet-analysis
workspace/skills/packet-analysis/SKILL.md
Analyze network packet captures (.pcap/.pcapng) using Packet Buddy MCP. Use when opening a pcap file, inspecting packet captures, troubleshooting network traffic, analyzing retransmissions, or filtering packets by protocol.
$ install --global
skillsauthnpx skillsauth add automateyournetwork/netclaw packet-analysisInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Apr 20, 2026, 3:29 AM4.2s1 file scanned
SKILL.md
- name:
- packet-analysis
- description:
- Analyze network packet captures (.pcap/.pcapng) using Packet Buddy MCP. Use when opening a pcap file, inspecting packet captures, troubleshooting network traffic, analyzing retransmissions, or filtering packets by protocol.
- version:
- 1.0.0
- license:
- Apache-2.0
- tags:
- [packets, pcap, wireshark, tshark, troubleshooting]
Packet Analysis Skill
MCP Server
- Script:
$PACKET_BUDDY_MCP_SCRIPT - Invocation:
python3 $MCP_CALL "python3 -u $PACKET_BUDDY_MCP_SCRIPT" <tool_name> '<json_args>'
Available Tools
Discovery
- list_pcaps — List all pcap files available for analysis
- pcap_summary — High-level stats: packet count, duration, capture size
Traffic Analysis
- pcap_protocol_hierarchy — Protocol breakdown (what % is TCP, UDP, DNS, etc.)
- pcap_conversations — Who talked to whom (IP, TCP, UDP, or Ethernet layer)
- pcap_endpoints — Top talkers by traffic volume
Filtering & Inspection
- pcap_filter — Apply Wireshark display filters (e.g.
tcp.port==80,icmp,bgp) - pcap_packet_detail — Full decode of a specific packet by number
- pcap_to_json — Export packets as JSON for detailed analysis
- pcap_expert_info — Warnings, errors, retransmissions, anomalies
Protocol-Specific
- pcap_dns_queries — Extract all DNS queries and responses
- pcap_http_requests — Extract HTTP methods, URIs, and hosts
File Management
- save_pcap_from_base64 — Save a base64-encoded pcap (e.g. from Slack file upload)
Workflow: Slack pcap Upload
When a user uploads a .pcap or .pcapng file in Slack:
- The file arrives as a Slack file attachment
- Download the file content and save it using save_pcap_from_base64
- Run pcap_summary to give an overview
- Ask the user what they want to investigate
- Use appropriate tools to drill down
Workflow: Troubleshooting
When investigating a network issue with a pcap:
- Start with pcap_summary for the big picture
- Check pcap_protocol_hierarchy — any unexpected protocols?
- Look at pcap_conversations — who's talking to whom?
- Use pcap_expert_info for retransmissions, resets, errors
- Apply pcap_filter to focus on specific traffic
- Use pcap_packet_detail for deep inspection of suspect packets
Common Display Filters
| Filter | Purpose |
|--------|---------|
| tcp.analysis.retransmission | TCP retransmissions |
| tcp.flags.reset==1 | TCP RST packets |
| dns | All DNS traffic |
| icmp | Ping and ICMP errors |
| bgp | BGP routing protocol |
| ospf | OSPF routing protocol |
| tcp.port==22 | SSH traffic |
| http | HTTP requests/responses |
| tls.handshake | TLS handshakes |
| arp | ARP requests/replies |
| stp | Spanning Tree Protocol |
| ip.addr==10.0.0.1 | Traffic to/from specific host |
Environment Variables
PACKET_BUDDY_MCP_SCRIPT— Path to packet-buddy-mcp/server.pyPCAP_UPLOAD_DIR— Directory for pcap files (default: /tmp/netclaw-pcaps)
Important Rules
- Large pcaps can be slow — use filters to narrow down
- When showing results, summarize key findings rather than dumping raw output
- Always check pcap_expert_info first — tshark already flags the problems
- For Slack uploads, confirm the file was saved before attempting analysis
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