Borrowing it
Nothing to install: this file belongs to po4yka/RIPDPI. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/po4yka/RIPDPI/main/.agents/skills/desync-engine/SKILL.mdgit clone --depth 1 https://github.com/po4yka/RIPDPIWrote 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.
[](https://agentmods.dev/skills/po4yka/ripdpi/desync-engine)<a href="https://agentmods.dev/skills/po4yka/ripdpi/desync-engine"><img src="https://agentmods.dev/badge/skills/po4yka/ripdpi/desync-engine/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/po4yka/ripdpi/desync-engine"><img src="https://agentmods.dev/badge/skills/po4yka/ripdpi/desync-engine.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00061 | $0.07775 |
| Opus 5.5 | $0.00024 | $0.03110 |
| Sonnet 5.5 | $0.00012 | $0.01555 |
| Haiku 4.5 | $0.00006 | $0.00777 |
Grade A, and why
desync-engine 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 yesterday.
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.
How it starts
The opening of the file, as written. The whole thing — 458 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Desync Engine -- RIPDPI
Purpose
Document the three-layer DPI desync pipeline that RIPDPI uses to evade middlebox inspection: configuration model (ripdpi-config), planning (ripdpi-desync), and execution (ripdpi-desync-runtime through ripdpi-proxy-runtime). Apply this skill when modifying any layer of the pipeline, adding new desync techniques, or reasoning about why a strategy works (or doesn't) on a specific Android deployment mode.
Conceptual model
DPI (Deep Packet Inspection) systems like Russia's middlebox inspect the first packets of a TCP/UDP connection to fingerprint the protocol and destination. They look for TLS ClientHello SNI fields, HTTP Host headers, and QUIC Initial packet metadata. If the destination matches a blocklist, the DPI injects a RST or drops the connection.
Desync evasion works by making the first packets unreadable to the DPI while remaining valid to the destination server. Techniques include:
- Splitting the payload across multiple TCP segments so no single packet contains the full SNI/Host value.
- Disordering segments so the DPI reassembly engine sees garbage first.
- Injecting fake packets with low TTL that reach the DPI but expire before the destination, poisoning the DPI's reassembly buffer.
- TLS record fragmentation to split the ClientHello across TLS records within a single TCP segment.
- UDP/QUIC fake bursts and SNI splitting for QUIC Initial packets.
Architecture overview
The desync engine is a three-layer pipeline:
Layer 1: Configuration model (ripdpi-config)
Files: native/rust/crates/ripdpi-config/src/model/ (start at mod.rs; group and runtime settings are split by domain)
Defines the data model: DesyncGroup, DesyncGroupActionSettings,
TcpChainStep, TcpChainStepKind, UdpChainStep, UdpChainStepKind,
OffsetBase, OffsetExpr, ActivationFilter, DesyncMode, EntropyMode,
QuicFakeProfile, SeqOverlapFakeMode. These are pure data types with no
I/O -- they represent what the user configured.
What ships with it
2 files 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.
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.
- yesterday First seen · 458 lines · 61 tokens per session scan A 6ecdd24cfbf3
desync-engine is a skill published in the GitHub repository po4yka/RIPDPI (85 stars, last pushed yesterday), licensed BSD-3-Clause. It adds 61 tokens to every session and 7,775 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-11-07.
desync-engine compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| desync-enginepo4yka/RIPDPI | Skill | 85 | yesterday | BSD-3-Clause | A | 61 | Claude Code, Codex |
| cindy-plugin-creatormakecindy/cindy | Skill | 9.5k | today | Apache-2.0 | A | 48 | Codex |
| argent-react-native-app-workflowsoftware-mansion/argent | Skill | 3.2k | today | Apache-2.0 | A | 46 | Claude Code, Codex |
| engineer-bot-opsmakecindy/cindy | Skill | 9.5k | today | Apache-2.0 | A | 57 | Claude Code, Codex |
| apple-search-ads-review-evidencemakecindy/cindy | Skill | 9.5k | today | Apache-2.0 | A | 59 | Claude Code, Codex |
| seo-aeo-desk-evidencemakecindy/cindy | Skill | 9.5k | today | Apache-2.0 | A | 43 | Claude Code, Codex |
| argent-tv-interactsoftware-mansion/argent | Skill | 3.2k | today | Apache-2.0 | A | 107 | Claude Code, Codex |