A guide for building applications on Stellar, a blockchain network, including Soroban smart contracts written in Rust, client software, wallets, and transactions.

Use it to create and test Soroban contracts, connect Stellar wallets, issue assets, build and confirm transactions, use Stellar client libraries, and review Stellar code for security.

It gives developers one set of choices for Stellar work and helps avoid using outdated interfaces or tools meant for other blockchains.

How mercato-supply-chain/mercato-dapp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to mercato-supply-chain/mercato-dapp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/mercato-supply-chain/mercato-dapp/develop/.agents/skills/stellar-dev/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/mercato-supply-chain/mercato-dapp

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/mercato-supply-chain/mercato-dapp/stellar-dev/github.svg)](https://agentmods.dev/skills/mercato-supply-chain/mercato-dapp/stellar-dev)

Your own site

<a href="https://agentmods.dev/skills/mercato-supply-chain/mercato-dapp/stellar-dev"><img src="https://agentmods.dev/badge/skills/mercato-supply-chain/mercato-dapp/stellar-dev/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/mercato-supply-chain/mercato-dapp/stellar-dev"><img src="https://agentmods.dev/badge/skills/mercato-supply-chain/mercato-dapp/stellar-dev.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 150 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,656 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00150	$0.01656
Opus 5.5	$0.00060	$0.00662
Sonnet 5.5	$0.00030	$0.00331
Haiku 4.5	$0.00015	$0.00166

Measured 2mo ago against content hash 6d348ef0a37a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

stellar-dev 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 2mo 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.

.agents/skills/stellar-dev/SKILL.md · 140 lines

How it starts

The opening of the file, as written. The whole thing — 140 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Stellar Development Skill (Soroban-first)

What this Skill is for

Use this Skill when the user asks for:

Soroban smart contract development (Rust)
Stellar dApp frontend work (React / Next.js / Node.js)
Wallet connection + signing flows (Freighter, etc.)
Transaction building / sending / confirmation
Stellar Asset issuance and management
Client SDK usage (JavaScript, Python, Go, Rust)
Zero-knowledge proof verification (where supported by target network/protocol)
Privacy-preserving applications (privacy pools, confidential tokens)
Local testing and deployment
Security hardening and audit-style reviews

What this Skill is NOT for

Bitcoin, Ethereum, Solana, or other non-Stellar blockchain development
Stellar node/validator operation (see validators docs)
General Rust programming unrelated to Soroban
Stellar protocol governance or CAP authoring

Default stack decisions (opinionated)

1. Smart Contracts: Soroban (Rust)

Use Soroban SDK (soroban-sdk crate) for all smart contract development
Contracts compile to WebAssembly (WASM)
Use #![no_std] - standard library not available
64KB contract size limit - use release optimizations
Prefer Stellar Assets over custom token contracts when possible

2. Client SDK: stellar-sdk (JavaScript) first

Use @stellar/stellar-sdk for browser and Node.js applications
Supports both Stellar RPC and legacy Horizon API
Full transaction building, signing, and submission
Soroban contract deployment and invocation

3. API Access: Stellar RPC first (Horizon legacy-focused)

Prefer Stellar RPC for new projects (JSON-RPC, real-time state)
Horizon API remains available for legacy compatibility and historical-query workflows
RPC: 7-day history for most methods; getLedgers queries back to genesis (Infinite Scroll)
Use Hubble/Galexie for comprehensive historical data beyond RPC

4. Token Strategy: Stellar Assets first

Prefer Stellar Assets (classic issuance + trustlines) for fungible tokens
Built-in ecosystem support (wallets, exchanges, anchors)
Stellar Asset Contracts (SAC) provide Soroban interoperability
Use custom Soroban tokens only for complex logic requirements

Read the full file on GitHub · 140 lines

Files

What ships with it

12 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.

Changes

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.

2mo ago First seen · 140 lines · 150 tokens per session scan A 6d348ef0a37a

Subscribe to this mod's changes

stellar-dev is a skill published in the GitHub repository mercato-supply-chain/mercato-dapp (5 stars, last pushed 9d ago), licensed Apache-2.0. It adds 150 tokens to every session and 1,656 once invoked, about $0.0006 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 2026-08-31.

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mercato-dapp: Skill for Claude Code