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 ersinkoc/security-check --skill sc-protocol-securitygit clone --depth 1 https://github.com/ersinkoc/security-checkWrote 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/ersinkoc/security-check/sc-protocol-security)<a href="https://agentmods.dev/skills/ersinkoc/security-check/sc-protocol-security"><img src="https://agentmods.dev/badge/skills/ersinkoc/security-check/sc-protocol-security/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/ersinkoc/security-check/sc-protocol-security"><img src="https://agentmods.dev/badge/skills/ersinkoc/security-check/sc-protocol-security.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 | $0.00021 | $0.01839 |
| Opus 5.5 | $0.00008 | $0.00736 |
| Sonnet 5.5 | $0.00004 | $0.00368 |
| Haiku 4.5 | $0.00002 | $0.00184 |
Grade A, and why
sc-protocol-security 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 — 154 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SC: Protocol, RPC, and Messaging Security
Purpose
Assess security across gRPC, Protobuf, GraphQL transports, custom protocols, queues, brokers, pub/sub, webhooks, event buses, and streaming RPC. Schema-valid messages are not automatically authentic, authorized, current, ordered, or safe.
Activation
Run when reconnaissance finds .proto or schema files, RPC registration, message consumers, publishers, webhook handlers, queues, topics, subscriptions, event envelopes, correlation IDs, acknowledgements, retry/dead-letter logic, or custom framing and decoding.
Phase 1: Discovery
Message lifecycle inventory
Draw producer -> transport or broker -> gateway -> consumer -> storage for every material message family. Record:
- producer and authenticated channel identity;
- envelope, headers, routing metadata, and payload schema;
- authoritative tenant, user, resource, and operation fields;
- parser versions and generated/custom decoders;
- interceptor, middleware, consumer, and per-resource authorization;
- acknowledgement, commit, retry, ordering, deduplication, and dead-letter behavior;
- callback, reply, cancellation, and correlation lifecycle.
Registration and alternate paths
Compare unary and streaming RPCs, direct and gateway-transcoded routes, reflection and health services, normal and compatibility services, synchronous and queued operations, retries and replays, dead-letter consumers, administrative reprocessing, and migration paths.
Deployment facts
Identify broker ACLs, service identities, mesh policies, topic attachments, webhook ingress controls, signature secrets, and runtime routing that are visible in source. Keep decisive external facts as validation blockers rather than assuming secure or insecure deployment.
Phase 2: Vulnerability Hunting
Parsing and interpretation
- Components disagree on duplicate fields, unknown fields, numeric width, normalization, compression, framing, or envelope/body precedence.
- Missing discriminators, unknown enum values, zero values, or compatibility defaults select privileged behavior.
- Multiple schema versions decode one wire representation into security-relevant different values.
- A parser accepts trailing, truncated, ambiguous, or recursively nested data that downstream code interprets differently.
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 · 154 lines · 21 tokens per session scan A 0c6c4c1366e6
sc-protocol-security is a skill published in the GitHub repository ersinkoc/security-check (83 stars, last pushed 17d ago), licensed MIT. It adds 21 tokens to every session and 1,839 once invoked, about $0.0001 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 2026-09-16.
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