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.
npx skills add hamzabellouch/agent-skills --skill fix-protocol-financial-tradinggit clone --depth 1 https://github.com/hamzabellouch/agent-skillsWrote 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/hamzabellouch/agent-skills/fix-protocol-financial-trading)<a href="https://agentmods.dev/skills/hamzabellouch/agent-skills/fix-protocol-financial-trading"><img src="https://agentmods.dev/badge/skills/hamzabellouch/agent-skills/fix-protocol-financial-trading/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/hamzabellouch/agent-skills/fix-protocol-financial-trading"><img src="https://agentmods.dev/badge/skills/hamzabellouch/agent-skills/fix-protocol-financial-trading.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 | $0.00065 | $0.03093 |
| Opus 5.5 | $0.00026 | $0.01237 |
| Sonnet 5.5 | $0.00013 | $0.00619 |
| Haiku 4.5 | $0.00006 | $0.00309 |
Grade A, and why
fix-protocol-financial-trading 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 282 lines — stays where its author put it; the contents beside it link to each section on GitHub.
FIX Protocol Financial Trading & Messaging Architecture
This skill package defines enterprise standards for high-frequency financial trading systems, order management systems (OMS), and execution management systems (EMS) utilizing FIX (Financial Information eXchange) protocol versions 4.2, 4.4, and 5.0 SP2 (FIXML / SBE).
1. Core Session & Application Architecture
Session Layer Management & Resend Recovery
- Session State Persistence: Maintain strictly synchronized sequence numbers (
MsgSeqNum, Tag 34) for incoming and outgoing messages. Store session state in memory-mapped files (MMAP) or persistent low-latency disk storage. - Sequence Gap Handling & Recovery:
- When an incoming
MsgSeqNumis greater than expected, immediately issue aResendRequest(MsgType2, Tag 35=2). - Respond to incoming
ResendRequestmessages by re-sending administrative messages asSequenceReset-GapFill(MsgType4, Tag 35=4, Tag 123GapFillFlag=Y) and re-sending application messages withPossDupFlag=Y(Tag 43).
- When an incoming
- Heartbeat & Test Request Loop: Send
Heartbeat(Tag 35=0) at specifiedHeartBtInt(Tag 108) intervals. If no activity is received withinHeartBtInt + Margin, issue aTestRequest(Tag 35=1) with a uniqueTestReqID(Tag 112). Drop session if response is absent.
Low-Latency Messaging Engineering
- Zero-GC & Zero-Copy Memory Management: Eliminate object allocations on hot execution paths. Utilize ring buffers (e.g., LMAX Disruptor pattern) and pre-allocated byte buffers for message serialization.
- Encoding Formats: Use SBE (Simple Binary Encoding) or FAST (FIX Adapted for STreaming) for ultra-low latency market data feeds over UDP multicast, replacing legacy tag-value pairs.
- Transport Security & Network Topologies: Enforce mTLS 1.3 or IPsec VPN tunnels across dedicated cross-connects (Equinix NY4, LD4, TY3). Enable
TCP_NODELAY(disable Nagle's algorithm) and pin thread CPU affinity.
2. Key FIX Tag Reference Matrix
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.
- 1mo ago First seen · 282 lines · 65 tokens per session scan A f7e1f44c8232
fix-protocol-financial-trading is a skill published in the GitHub repository hamzabellouch/agent-skills (8 stars, last pushed 11d ago), licensed MIT. It adds 65 tokens to every session and 3,093 once invoked, about $0.0003 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 2026-09-03.
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