network-bgp-diagnostics

network-bgp-diagnostics is a skill for Claude Code, Codex from JunMystery/Agent-Guidance-Python. It costs 31 tokens per session (1,340 once invoked), scanned A, a copy of network-bgp-diagnostics, MIT.

A read-only troubleshooting guide for BGP, the routing protocol that exchanges network paths between autonomous systems.

In plain words
What is it for?
Use it to inspect BGP neighbor states, route exchange, prefixes, route filters, AS paths, and reset evidence.
Why use it?
It helps identify whether a broken session, missing route, or unexpected advertisement comes from connectivity or routing policy.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/junmystery/agent-guidance-python/network-bgp-diagnostics
Any agent
npx skills add JunMystery/Agent-Guidance-Python --skill network-bgp-diagnostics
Clone the repo
git clone --depth 1 https://github.com/JunMystery/Agent-Guidance-Python

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for network-bgp-diagnostics

README.md
[![agentmods](https://agentmods.dev/badge/skills/junmystery/agent-guidance-python/network-bgp-diagnostics.svg)](https://agentmods.dev/skills/junmystery/agent-guidance-python/network-bgp-diagnostics)
Your own site
<a href="https://agentmods.dev/skills/junmystery/agent-guidance-python/network-bgp-diagnostics"><img src="https://agentmods.dev/badge/skills/junmystery/agent-guidance-python/network-bgp-diagnostics.svg" alt="Measured on agentmods" height="20"></a>
Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,340 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 97% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00031 $0.01340
Opus 5 $0.00015 $0.00670
Sonnet 5 $0.00006 $0.00268
Haiku 4.5 $0.00003 $0.00134

Measured 2d ago against content hash 6011f720b566, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

network-bgp-diagnostics scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

97% identical to network-bgp-diagnostics — 3 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/network-bgp-diagnostics/SKILL.md · 168 lines

How it starts

The opening of the file, as written. The whole thing — 168 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Network BGP Diagnostics

Use this skill when a BGP session is down, flapping, established with missing routes, or advertising unexpected prefixes. The default workflow is read-only evidence collection; policy and reset actions belong in a reviewed change window.

When to Use

  • BGP neighbors are stuck in Idle, Connect, Active, OpenSent, or OpenConfirm.
  • A session is Established but expected prefixes are missing.
  • A route-map, prefix-list, max-prefix limit, or AS path policy may be filtering routes.
  • You need before/after evidence for a BGP change.
  • You are reviewing automation that parses BGP summary output.

Read-Only Triage Flow

  1. Identify the exact neighbor, address family, VRF, and local/remote ASNs.
  2. Capture summary state and last reset reason.
  3. Prove reachability to the peer source address.
  4. Check route policy references before assuming transport failure.
  5. Compare advertised, received, and installed routes where the platform supports those commands.
show bgp summary
show bgp neighbors <peer>
show ip route <peer>
show tcp brief | include <peer>|:179
show logging | include BGP|<peer>
show running-config | section router bgp
show ip prefix-list
show route-map

Use platform-specific address-family commands when the device uses VRFs, IPv6, VPNv4, or EVPN. Do not assume global IPv4 unicast.

State Interpretation

State First checks
Established with prefix count Route exchange is up; inspect policy and table selection
Established with zero prefixes Check inbound policy, max-prefix, advertised routes, and AFI/SAFI
Active TCP session is not completing; check routing, source, ACLs, and peer reachability
Connect TCP connection is in progress; check path and remote listener
OpenSent/OpenConfirm TCP works; check ASN, authentication, timers, capabilities, and logs
Idle Neighbor may be disabled, missing config, blocked by policy, or backoff timer

Transport Checks

ping <peer> source <local-source>
traceroute <peer> source <local-source>
show ip route <peer>
show bgp neighbors <peer> | include BGP state|Last reset|Local host|Foreign host

Read the full file on GitHub · 168 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 168 lines · 31 tokens per session scan A 6011f720b566

Subscribe to this mod's changes

network-bgp-diagnostics is a skill published in the GitHub repository JunMystery/Agent-Guidance-Python (2 stars, last pushed 1mo ago), licensed MIT. It adds 31 tokens to every session and 1,340 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 97% identical to network-bgp-diagnostics, differing in 3 lines, and is treated as a copy.

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