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 agentmods add skills/stellar/stellar-dev-skill/smart-contractsnpx skills add stellar/stellar-dev-skill --skill smart-contractsgit clone --depth 1 https://github.com/stellar/stellar-dev-skillWhat 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 | $0.00151 | $0.02228 |
| Opus 5 | $0.00076 | $0.01114 |
| Sonnet 5 | $0.00030 | $0.00446 |
| Haiku 4.5 | $0.00015 | $0.00223 |
Grade A, and why
smart-contracts 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 2d 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 — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Stellar Smart Contracts
Guide for building Stellar smart contracts in Rust. Smart contracts on Stellar were formerly branded "Soroban" — the platform name is retired, but the Rust SDK (soroban-sdk) and several tool names keep the prefix.
This file covers setup and the core workflow. The deep dives live alongside it — read the file that matches the task:
| Task | File |
|---|---|
| Storage/TTL, authorization, constructors, cross-contract calls, tokens, events, errors, upgrades, factories, governance/DeFi patterns, fees/resources, troubleshooting | development.md |
| Unit, integration, fuzz, property, fork, and mutation testing | testing.md |
| Security review, vulnerability classes, checklists, audit prep, tooling | security.md |
When to use this skill
- Writing a Stellar smart contract in Rust
- Setting up contract tests (any layer)
- Reviewing a contract for security issues
- Architecting upgradeable contracts, factories, custom accounts, or DeFi primitives
- Debugging a contract-specific error (auth, storage, archival, resource limits)
Related skills
- Asset issuance, trustlines, and SAC deployment →
../assets/SKILL.md - Frontend/wallets that call your contract →
../dapp/SKILL.md - Chain data queries (RPC/Horizon) →
../data/SKILL.md - ZK verification (BLS12-381, Groth16, Circom/Noir/RISC Zero) →
../zk-proofs/SKILL.md - SEP/CAP standards and ecosystem links →
../standards/SKILL.md
Versions
This skill was written against protocol 27 (soroban-sdk v27, rs-soroban-env v27, stellar-cli v27). Version numbers in examples are illustrative — resolve the current ones from these sources rather than trusting any doc:
soroban-sdkmajor version tracks the protocol version (SDK 27 ↔ protocol 27). This rule outlives any specific release.- Latest SDK release: crates.io/crates/soroban-sdk (or
cargo add soroban-sdk, which resolves it). Pre-releases (-rc.x) exist only during a protocol rollout and must be pinned with the exact version string; GitHub releases lists them with changelogs. - Networks upgrade by validator vote, testnet before mainnet — pin the SDK major matching the network you deploy to. Live protocol version: RPC
getVersionInfoor Stellar Lab. - Numeric network limits quoted here are mainnet settings at time of writing; they change by vote — Stellar Lab's Network Limits page and
stellar network settings --network mainnetshow the live values.
What ships with it
3 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.
- 2d ago First seen · 222 lines · 151 tokens per session scan A 2561ecf13609
smart-contracts is a skill published in the GitHub repository stellar/stellar-dev-skill (51 stars, last pushed 4d ago), licensed Apache-2.0. It adds 151 tokens to every session and 2,228 once invoked, about $0.0008 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 2026-08-30.
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