rust-build

rust-build is a command for coding agents from Fmarzochi/EGC. It costs 8 tokens per session (459 once invoked), scanned A, original, Apache-2.0.

Fix Rust build errors and borrow checker issues.

Command

Install

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.

agentmods
npx agentmods add commands/fmarzochi/egc/rust-build
Clone the repo
git clone --depth 1 https://github.com/Fmarzochi/EGC

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.

agentmods badge for rust-build

README.md
[![agentmods](https://agentmods.dev/badge/commands/fmarzochi/egc/rust-build.svg)](https://agentmods.dev/commands/fmarzochi/egc/rust-build)
Your own site
<a href="https://agentmods.dev/commands/fmarzochi/egc/rust-build"><img src="https://agentmods.dev/badge/commands/fmarzochi/egc/rust-build.svg" alt="Measured on agentmods" height="20"></a>
Per session 8 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 459 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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.

ModelPer sessionOnce invoked
Fable 5 $0.00008 $0.00459
Opus 5 $0.00004 $0.00230
Sonnet 5 $0.00002 $0.00092
Haiku 4.5 $0.00001 $0.00046

Measured today against content hash cfa40217ef47, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

rust-build 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 today.

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.

.opencode/commands/rust-build.md · 79 lines

What it actually says

Rust Build Command

Fix Rust build, clippy, and dependency errors: $ARGUMENTS

Your Task

  1. Run cargo check: cargo check 2>&1
  2. Run cargo clippy: cargo clippy -- -D warnings 2>&1
  3. Fix errors one at a time
  4. Verify fixes don't introduce new errors

Common Rust Errors

Borrow Checker

cannot borrow `x` as mutable because it is also borrowed as immutable

Fix: Restructure to end immutable borrow first; clone only if justified

Type Mismatch

mismatched types: expected `T`, found `U`

Fix: Add .into(), as, or explicit type conversion

Missing Import

unresolved import `crate::module`

Fix: Fix the use path or declare the module (add Cargo.toml deps only for external crates)

Lifetime Errors

does not live long enough

Fix: Use owned type or add lifetime annotation

Trait Not Implemented

the trait `X` is not implemented for `Y`

Fix: Add #[derive(Trait)] or implement manually

Fix Order

  1. Build errors - Code must compile
  2. Clippy warnings - Fix suspicious constructs
  3. Formatting - cargo fmt compliance

Build Commands

cargo check 2>&1
cargo clippy -- -D warnings 2>&1
cargo fmt --check 2>&1
cargo tree --duplicates
cargo test

Verification

After fixes:

cargo check                  # Should succeed
cargo clippy -- -D warnings  # No warnings allowed
cargo fmt --check            # Formatting should pass
cargo test                   # Tests should pass

IMPORTANT: Fix errors only. No refactoring, no improvements. Get the build green with minimal changes.

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.

  1. today First seen · 79 lines · 8 tokens per session scan A cfa40217ef47

Subscribe to this mod's changes

rust-build is a command published in the GitHub repository Fmarzochi/EGC (48 stars, last pushed today), licensed Apache-2.0. It adds 8 tokens to every session and 459 once invoked, about $0.0000 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 2026-09-03.