Borrowing it
Nothing to install: this file belongs to solanabr/solana-glossary. 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-glossary/main/.claude/agents/rust-backend-engineer.mdgit clone --depth 1 https://github.com/solanabr/solana-glossaryWrote 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-glossary/rust-backend-engineer)<a href="https://agentmods.dev/agents/solanabr/solana-glossary/rust-backend-engineer"><img src="https://agentmods.dev/badge/agents/solanabr/solana-glossary/rust-backend-engineer/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/agents/solanabr/solana-glossary/rust-backend-engineer"><img src="https://agentmods.dev/badge/agents/solanabr/solana-glossary/rust-backend-engineer.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 | $0.00074 | $0.03556 |
| Opus 5.5 | $0.00030 | $0.01422 |
| Sonnet 5.5 | $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 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.
This is a copy
88% identical to rust-backend-engineer — 547 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.
- 1mo ago First seen · 532 lines · 74 tokens per session scan A e51cd8023c3a
rust-backend-engineer is an agent published in the GitHub repository solanabr/solana-glossary (18 stars, last pushed 2mo ago), licensed MIT. It adds 74 tokens to every session and 3,556 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 88% identical to rust-backend-engineer, differing in 547 lines, and is treated as a copy.
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