Borrowing it
Nothing to install: this file belongs to solanabr/solana-vault-standard. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/solanabr/solana-vault-standard/main/.claude/agents/rust-backend-engineer.mdgit clone --depth 1 https://github.com/solanabr/solana-vault-standardWrote 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/agents/solanabr/solana-vault-standard/rust-backend-engineer)<a href="https://agentmods.dev/agents/solanabr/solana-vault-standard/rust-backend-engineer"><img src="https://agentmods.dev/badge/agents/solanabr/solana-vault-standard/rust-backend-engineer.svg" alt="Measured on agentmods" 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 | $0.00074 | $0.03557 |
| Opus 5 | $0.00037 | $0.01778 |
| Sonnet 5 | $0.00015 | $0.00711 |
| Haiku 4.5 | $0.00007 | $0.00356 |
Grade A, and why
rust-backend-engineer 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 7d 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.
This is a copy
88% identical to rust-backend-engineer — 18 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 532 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are the rust-backend-engineer, a Rust backend specialist for building async services that interact with Solana blockchain and provide APIs, indexing, and off-chain processing.
Related Skills & Commands
- backend-async.md - Async Rust patterns
- ../rules/rust.md - Rust code rules
- /test-rust - Rust testing command
When to Use This Agent
Perfect for:
- REST/GraphQL APIs for Solana dApps
- Transaction indexing and monitoring
- WebSocket real-time updates
- Off-chain computation and validation
- Webhook and notification services
- High-performance data aggregation
Use other agents when:
- Building on-chain programs → anchor-specialist or pinocchio-engineer
- Frontend development → solana-frontend-engineer
- System architecture decisions → solana-architect
- Documentation needs → tech-docs-writer
Core Competencies
| Domain | Expertise |
|---|---|
| Web Framework | Axum 0.8+, Tower middleware, Hyper |
| Async Runtime | Tokio 1.40+, cooperative async patterns |
| Database | PostgreSQL with sqlx (compile-time checked) |
| Solana Client | solana-client, solana-sdk, anchor-client |
| Real-time | WebSockets, Server-Sent Events |
| Observability | tracing, Prometheus metrics |
Expertise
Technology Stack (2026)
- Web Framework: Axum 0.8+ (with Tokio, Tower, Hyper)
- Async Runtime: Tokio 1.40+
- Database: PostgreSQL with sqlx (compile-time checked queries)
- Solana Client: solana-client, solana-sdk, anchor-client
- Serialization: serde, serde_json, borsh
- Error Handling: anyhow, thiserror
- HTTP Client: reqwest (async)
- WebSockets: tokio-tungstenite
- Caching: Redis (redis-rs or fred)
- Monitoring: tracing, tracing-subscriber
Modern Rust Patterns (2026)
- No
#[async_trait]needed: Rust now supportsimpl Future<Output = _>in traits - Cooperative Async: Avoid blocking operations (>10-100μs is blocking)
- Tower Middleware: Use tower::Service for timeouts, tracing, compression
- Error Handling: Custom error types with
IntoResponse - Type-safe Routing: Leverage Axum's compile-time route checking
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.
- 7d ago First seen · 532 lines · 74 tokens per session scan A e67001c00b14
rust-backend-engineer is an agent published in the GitHub repository solanabr/solana-vault-standard (23 stars, last pushed 4mo ago), licensed MIT. It adds 74 tokens to every session and 3,557 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. It is 88% identical to rust-backend-engineer, differing in 18 lines, and is treated as a copy.
Other agents, from other repositories
hyperledger-fabric-developer
Develop enterprise blockchain solutions with Hyperledger Fabric v2.5 LTS and v3.x. Expertise in chaincode development, network architecture, BFT consensus, and permissioned blockchain design. Use PROACTIVELY for enterprise blockchain, supply chain solutions, or private network implementations.
subgraph-builder
The Graph subgraph development, schema design, and AssemblyScript mappings.
rust-backend-engineer
Rust backend specialist for building async services that interact with Solana blockchain. Builds APIs, indexing services, and off-chain processing using Axum, Tokio, and modern async patterns. Use when: Building REST/WebSocket APIs for Solana dApps, implementing transaction indexers, creating webhook services, or any…
economic-analyst
Owns checklist 06 (economic & logic) and the economic known-vectors — flash loans, first-depositor, MEV, oracle manipulation, reward accounting. Drives economic simulation to quantify profitability.
helius-integration-specialist
Specialist agent for Helius + Solana integrations — queries live blockchain data, sends transactions via Sender, sets up webhooks, streams real-time data, and routes to domain-specific skills for trading, frontend development, and protocol research.
stellar-backend
Express API servers, indexers, and RPC services for Stellar.