rust-build-resolver

rust-build-resolver is an agent for Claude Code from sjarmak/coding-agent-workflows. It costs 41 tokens per session (1,346 once invoked), scanned A, a copy of rust-build-resolver, MIT.

A Rust build-error helper for projects built with Cargo, Rust's package and build tool. It diagnoses compiler errors, ownership and lifetime problems, dependency issues, and Cargo configuration problems.

In plain words
What is it for?
Use it when cargo build or cargo check fails. It can investigate borrow-checker errors, trait mismatches, dependency features, compiler warnings, formatting, duplicate dependencies, and tests.
Why use it?
It turns build failures into a sequence of checks and applies small fixes while verifying that the project still builds and tests successfully.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it when cargo build or cargo check fails. It can investigate borrow-checker errors, trait mismatches, dependency features, compiler warnings, formatting, duplicate dependencies, and tests.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/sjarmak/coding-agent-workflows/rust-build-resolver
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.

Clone the repo
git clone --depth 1 https://github.com/sjarmak/coding-agent-workflows

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.

agentmods badge for rust-build-resolver

README.md
[![agentmods](https://agentmods.dev/badge/agents/sjarmak/coding-agent-workflows/rust-build-resolver/github.svg)](https://agentmods.dev/agents/sjarmak/coding-agent-workflows/rust-build-resolver)
Your own site
<a href="https://agentmods.dev/agents/sjarmak/coding-agent-workflows/rust-build-resolver"><img src="https://agentmods.dev/badge/agents/sjarmak/coding-agent-workflows/rust-build-resolver/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.

agentmods 80×15 button for rust-build-resolver

Your own site · 80×15
<a href="https://agentmods.dev/agents/sjarmak/coding-agent-workflows/rust-build-resolver"><img src="https://agentmods.dev/badge/agents/sjarmak/coding-agent-workflows/rust-build-resolver.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 41 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,346 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 95% copy Near-identical to another mod 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 5.1 $0.00041 $0.01346
Opus 5.5 $0.00016 $0.00538
Sonnet 5.5 $0.00008 $0.00269
Haiku 4.5 $0.00004 $0.00135

Measured 19d ago against content hash 3e9a096cec66, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

rust-build-resolver 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 19d 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.

Origin

This is a copy

95% identical to rust-build-resolver — 32 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.

source/agents/rust-build-resolver.md · 147 lines

How it starts

The opening of the file, as written. The whole thing — 147 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Rust Build Error Resolver

You are an expert Rust build error resolution specialist. Your mission is to fix Rust compilation errors, borrow checker issues, and dependency problems with minimal, surgical changes.

Core Responsibilities

  1. Diagnose cargo build / cargo check errors
  2. Fix borrow checker and lifetime errors
  3. Resolve trait implementation mismatches
  4. Handle Cargo dependency and feature issues
  5. Fix cargo clippy warnings

Diagnostic Commands

Run these in order:

cargo check 2>&1
cargo clippy -- -D warnings 2>&1
cargo fmt --check 2>&1
cargo tree --duplicates 2>&1
if command -v cargo-audit >/dev/null; then cargo audit; else echo "cargo-audit not installed"; fi

Resolution Workflow

1. cargo check          -> Parse error message and error code
2. Read affected file   -> Understand ownership and lifetime context
3. Apply minimal fix    -> Only what's needed
4. cargo check          -> Verify fix
5. cargo clippy         -> Check for warnings
6. cargo test           -> Ensure nothing broke

Common Fix Patterns

Error Cause Fix
cannot borrow as mutable Immutable borrow active Restructure to end immutable borrow first, or use Cell/RefCell
does not live long enough Value dropped while still borrowed Extend lifetime scope, use owned type, or add lifetime annotation
cannot move out of Moving from behind a reference Use .clone(), .to_owned(), or restructure to take ownership
mismatched types Wrong type or missing conversion Add .into(), as, or explicit type conversion
trait X is not implemented for Y Missing impl or derive Add #[derive(Trait)] or implement trait manually
unresolved import Missing dependency or wrong path Add to Cargo.toml or fix use path
unused variable / unused import Dead code Remove or prefix with _
expected X, found Y Type mismatch in return/argument Fix return type or add conversion
cannot find macro Missing #[macro_use] or feature Add dependency feature or import macro
multiple applicable items Ambiguous trait method Use fully qualified syntax: <Type as Trait>::method()
lifetime may not live long enough Lifetime bound too short Add lifetime bound or use 'static where appropriate
async fn is not Send Non-Send type held across .await Restructure to drop non-Send values before .await
the trait bound is not satisfied Missing generic constraint Add trait bound to generic parameter
no method named X Missing trait import Add use Trait; import

Read the full file on GitHub · 147 lines

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. 19d ago Changed · -2 lines 3e9a096cec66
  2. 1mo ago First seen · 149 lines · 41 tokens per session scan A 0b647d5484a2

Subscribe to this mod's changes

rust-build-resolver is an agent published in the GitHub repository sjarmak/coding-agent-workflows (7 stars, last pushed 20d ago), licensed MIT. It adds 41 tokens to every session and 1,346 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 95% identical to rust-build-resolver, differing in 32 lines, and is treated as a copy.

Related

Other agents, from other repositories

rust-build-resolver

Rust build, compilation, and dependency error resolution specialist. Fixes cargo build errors, borrow checker issues, and Cargo.toml problems with minimal changes. Use when Rust builds fail.

affaan-m/ECC · 41 tokens

rust-performance-engineer

Rust performance optimization specialist specializing in macOS optimizations (sccache, XProtect), profiling with flamegraph, benchmarking with criterion, and build speed improvements. Use when performance concerns are mentioned, slow code identified, build times need optimization, or macOS-specific optimization needed.

bug-ops/zeph · 60 tokens

rust-debugger

Rust debugging and troubleshooting specialist focused on systematic error diagnosis, runtime debugging with LLDB/GDB, panic analysis, async debugging, memory issues, and production incident investigation. Use PROACTIVELY when encountering compilation errors, runtime panics, unexpected behavior, performance anomalies…

bug-ops/zeph · 61 tokens

rust-agent

Idiomatisk Rust-utvikling med cargo, clippy, error handling, async/tokio, unsafe og testing.

navikt/copilot · 27 tokens

rust-engineer

Write, debug, and harden idiomatic systems code. TRIGGER WHEN: writing or implementing Rust: ownership patterns, async with tokio, trait design, error handling, FFI, performance optimization, or unsafe code review. DO NOT TRIGGER WHEN: the task is Tauri-specific (use tauri-desktop or tauri-mobile).

acaprino/daodan · 73 tokens

rust-clippy-fmt-check-tester

Rust build/quality error resolver fixing compile errors, clippy warnings, fmt issues, and test failures. Use when cargo build, clippy, fmt --check, or tests fail and you need minimal surgical fixes without refactoring the codebase.

VenTheZone/pi-dots · 58 tokens