Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/stellar/stellar-dev-skillnpx agentmods add skills/stellar/stellar-dev-skill/zk-proofsWrote 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/stellar/stellar-dev-skill/zk-proofs)<a href="https://agentmods.dev/skills/stellar/stellar-dev-skill/zk-proofs"><img src="https://agentmods.dev/badge/skills/stellar/stellar-dev-skill/zk-proofs/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/stellar/stellar-dev-skill/zk-proofs"><img src="https://agentmods.dev/badge/skills/stellar/stellar-dev-skill/zk-proofs.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00090 | $0.03987 |
| Opus 5.5 | $0.00036 | $0.01595 |
| Sonnet 5.5 | $0.00018 | $0.00797 |
| Haiku 4.5 | $0.00009 | $0.00399 |
Grade A, and why
zk-proofs 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 — 240 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Zero-Knowledge Proofs & Privacy
ZK verification on Stellar. Capability is protocol- and SDK-version dependent — always verify CAP status, network version, and soroban-sdk host-function support before relying on a primitive.
Last verified against Protocol 27 (mainnet, August 2026). CAP-0074/0075 shipped in Protocol 25 "X-Ray" and CAP-0080 (BN254 MSM, Fr arithmetic, on-curve checks) in Protocol 26 — if a doc tells you BN254 or Poseidon is "proposed", it predates that.
When to use this skill
- Implementing a Groth16 (or other SNARK) verifier as a Stellar smart contract
- Wiring Circom, Noir, or RISC Zero output to on-chain verification
- Building privacy pools, confidential tokens, or Merkle-tree-backed commitments
- Using the BN254 / Poseidon host functions (Protocol 25+)
Related skills
- Contract patterns and deployment →
../smart-contracts/development.md - Verifier security review →
../smart-contracts/security.md - CAPs referenced here →
../standards/SKILL.md
What's available — verify before building
| Primitive | CAP | Status |
|---|---|---|
| BLS12-381 ops (G1/G2 add, mul, MSM, pairing check, hash-to-curve, Fr arithmetic) | CAP-0059 | Available (Protocol 22+) |
BN254 base ops (G1 add/mul, pairing check — crypto::bn254) |
CAP-0074 | Available (Protocol 25+) |
BN254 G1 MSM, Fr arithmetic (fr_add/sub/mul/pow/inv), on-curve checks |
CAP-0080 | Available (Protocol 26+) |
| Poseidon/Poseidon2 permutation primitives (not complete hash functions) | CAP-0075 | Available (Protocol 25+) |
Before implementation, always confirm:
- CAP status in the preamble (
Accepted/Implementedvs draft) - Target network protocol version (software versions)
soroban-sdkrelease support for the host functions you need
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 · 240 lines · 90 tokens per session scan A 7549d4e4ae49
zk-proofs is a skill published in the GitHub repository stellar/stellar-dev-skill (54 stars, last pushed 3d ago), licensed Apache-2.0. It adds 90 tokens to every session and 3,987 once invoked, about $0.0004 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 2026-08-30.
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