evo-azure-bgp-oscillation-route-leak

evo-azure-bgp-oscillation-route-leak is a skill for Claude Code, Codex from OpenLAIR/OpenSkill. It costs 59 tokens per session (703 once invoked), scanned A, original, Apache-2.0.

A network analysis tool for Azure Virtual WAN, Microsoft's managed wide-area networking service, that detects BGP routing preference cycles and route leaks. BGP is the protocol networks use to exchange routes.

In plain words
What is it for?
Use it to inspect multi-hub Azure Virtual WAN topologies, report affected autonomous systems, and assess proposed fixes against valley-free routing rules.
Why use it?
It helps find routing problems that can prevent networks from settling on stable paths or can send traffic through unintended links.

Skill for Claude CodeCodex

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

Good fit Use it to inspect multi-hub Azure Virtual WAN topologies, report affected autonomous systems, and assess proposed fixes against valley-free routing rules.

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Install with agentmods
npx agentmods add skills/openlair/openskill/evo-azure-bgp-oscillation-route-leak
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.

Any agent
npx skills add OpenLAIR/OpenSkill --skill evo-azure-bgp-oscillation-route-leak
Clone the repo
git clone --depth 1 https://github.com/OpenLAIR/OpenSkill

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.

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README.md
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Your own site
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agentmods 80×15 button for evo-azure-bgp-oscillation-route-leak

Your own site · 80×15
<a href="https://agentmods.dev/skills/openlair/openskill/evo-azure-bgp-oscillation-route-leak"><img src="https://agentmods.dev/badge/skills/openlair/openskill/evo-azure-bgp-oscillation-route-leak.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 59 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 703 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found 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 $0.00059 $0.00703
Opus 5 $0.00030 $0.00351
Sonnet 5 $0.00012 $0.00141
Haiku 4.5 $0.00006 $0.00070

Measured today against content hash 1a554fc0f2b6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

evo-azure-bgp-oscillation-route-leak 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 today.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/utils.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

tasks-evolved/azure-bgp-oscillation-route-leak/environment/skills/evo-azure-bgp-oscillation-route-leak/SKILL.md · 61 lines

How it starts

The opening of the file, as written. The whole thing — 61 lines — stays where its author put it; the contents beside it link to each section on GitHub.

BGP Route Oscillation and Route Leak Analyzer for Azure Virtual WAN

Detects BGP route oscillation and valley-free route leak violations in Azure Virtual WAN multi-hub topologies, then evaluates whether proposed solutions resolve each issue.

Domain Knowledge

Oscillation Detection (Preference Cycle)

A BGP oscillation occurs when ASes form a mutual routing preference cycle: e.g., AS A prefers routes via AS B, while AS B prefers routes via AS A. The preference graph is a directed functional graph (out-degree ≤ 1 per node). A cycle of any length causes persistent non-convergence. Detection uses DFS-based traversal with path tracking.

Output: oscillation_cycle and affected_ases are deterministically ordered (rotated so the smallest ASN appears first).

Route Leak Detection (Gao-Rexford Valley-Free Model)

Under the Gao-Rexford valley-free routing principle (RFC 7908):

  • Customer-learned routes → may export to anyone (customers, peers, providers)
  • Peer-learned routes → may export to customers ONLY
  • Provider-learned routes → may export to customers ONLY

A route leak = exporting peer-learned or provider-learned routes to a peer or provider.

Solution Evaluation Rules

Fixes OSCILLATION:

  1. Explicitly stop one cycle participant from preferring the other (stop preferring routes via)
  2. Route preference hierarchy that deprioritizes peer routes (breaks cycle edge)
  3. Export policy filtering peer-learned routes between cycle participants
  4. Data-plane override: UDR or Routing Intent

Fixes ROUTE LEAK:

  1. Export policy blocking provider-learned routes to peers (source-side)
  2. BGP community no-export on provider routes (source-side)
  3. Ingress filtering rejecting routes with provider AS in path (receiver-side)
  4. RPKI origin validation (receiver-side)
  5. Data-plane override: UDR or Routing Intent

Fixes BOTH: UDR and Routing Intent (forwarding layer overrides)

Fixes NEITHER:

  • Timer tuning (keepalive/holdtime), route dampening, ECMP, max-prefix limits
  • Waiting for convergence, restarting BGP, prefix-list filtering
  • Generic AS-PATH/MED heuristics, generic route maps without specific config
  • Disabling BGP sessions / shutting down peering / removing gateways (connectivity destruction — not acceptable)

Read the full file on GitHub · 61 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. today First seen · 61 lines · 59 tokens per session scan A 1a554fc0f2b6

Subscribe to this mod's changes

evo-azure-bgp-oscillation-route-leak is a skill published in the GitHub repository OpenLAIR/OpenSkill (88 stars, last pushed yesterday), licensed Apache-2.0. It adds 59 tokens to every session and 703 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-11.

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