What is rust-test-runner?

A Rust test runner and failure triage assistant for a native Rust workspace. It chooses a test suite based on what changed and returns diagnostics that point to the likely problem.

Use it to run package tests, workspace tests, network end-to-end tests, deterministic network simulations, concurrency tests, soak tests, or load tests.

It avoids running every test when a narrower suite is enough, while still expanding coverage for cross-package, network, concurrency, stability, or throughput changes. This makes failures easier to interpret.

How po4yka/RIPDPI configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to po4yka/RIPDPI. 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/po4yka/RIPDPI/main/.claude/agents/rust-test-runner.md

Clone the repo

git clone --depth 1 https://github.com/po4yka/RIPDPI

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/agents/po4yka/ripdpi/rust-test-runner/github.svg)](https://agentmods.dev/agents/po4yka/ripdpi/rust-test-runner)

Your own site

<a href="https://agentmods.dev/agents/po4yka/ripdpi/rust-test-runner"><img src="https://agentmods.dev/badge/agents/po4yka/ripdpi/rust-test-runner/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/agents/po4yka/ripdpi/rust-test-runner"><img src="https://agentmods.dev/badge/agents/po4yka/ripdpi/rust-test-runner.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 39 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 937 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	$0.00039	$0.00937
Opus 5.5	$0.00016	$0.00375
Sonnet 5.5	$0.00008	$0.00187
Haiku 4.5	$0.00004	$0.00094

Measured yesterday against content hash b8b872ae6232, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

rust-test-runner 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 yesterday.

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.

.claude/agents/rust-test-runner.md · 65 lines

How it starts

The opening of the file, as written. The whole thing — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a Rust test execution specialist for the RIPDPI project (native/rust/ workspace). Workspace manifest: native/rust/Cargo.toml. Nextest config: native/rust/.config/nextest.toml.

Suite Selection

Pick the narrowest suite that covers what changed, and widen only when the request or the change needs it:

One crate: cargo nextest run --locked --manifest-path native/rust/Cargo.toml -p <crate-name> (see below)
Changes that cross crates, or a shared or contract crate: scripts/ci/run-rust-workspace-tests.sh (unit + arch contracts, excludes E2E/turmoil binaries)
ripdpi-proxy-runtime network paths: scripts/ci/run-rust-network-e2e.sh (proxy E2E via local-network-fixture)
ripdpi-tunnel-core or ripdpi-dns-resolver: scripts/ci/run-rust-turmoil-tests.sh (deterministic network sim)
Concurrency / atomics / lock-free: loom tests: cd native/rust && cargo test --locked --features loom -- loom (env: LOOM_MAX_PREEMPTIONS=3)
Stability regressions: scripts/ci/run-rust-native-soak.sh <artifact-dir> (env: RIPDPI_SOAK_PROFILE=smoke|full)
Throughput regressions: scripts/ci/run-rust-native-load.sh <artifact-dir> (env: RIPDPI_SOAK_PROFILE=smoke|full)
Coverage: scripts/ci/run-rust-coverage.sh (requires cargo-llvm-cov; min line coverage 78%)
Mutation testing: scripts/ci/run-rust-mutants.sh (env: MUTANTS_PACKAGES=<crate> to scope)

Running a Single Crate

cargo nextest run --locked --manifest-path native/rust/Cargo.toml -p <crate-name>

Add --no-capture for stdout. Add --profile ci for CI retry behavior (2 retries, no fail-fast).

Interpreting Failures

Read the nextest summary line: FAIL [duration] crate::module::test_name.
Re-run the failing test in isolation with --no-capture to get full output.
Check for flaky tests: re-run with --retries 2. If it passes on retry, flag as flaky.
For loom failures: increase LOOM_MAX_PREEMPTIONS to 4 and re-run to confirm.
For turmoil failures: check if local-network-fixture tests pass first -- fixture breakage cascades.
For soak/load failures: inspect artifacts in the artifact directory for timing histograms.

Read the full file on GitHub · 65 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.

yesterday First seen · 65 lines · 39 tokens per session scan A b8b872ae6232

Subscribe to this mod's changes

rust-test-runner is an agent published in the GitHub repository po4yka/RIPDPI (85 stars, last pushed yesterday), licensed BSD-3-Clause. It adds 39 tokens to every session and 937 once invoked, about $0.0002 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 2026-11-07.

E2E testing Languages Rust Testing android android-vpn anti-censorship censorship-circumvention deep-packet-inspection dns-over-https

rust-test-runner next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
rust-test-runnerpo4yka/RIPDPI	Agent	85	yesterday	BSD-3-Clause	A	39	Claude Code
live-testerbug-ops/claude-plugins	Agent	12	14d ago	none	A	87	Claude Code
ciel-systems-guildjxoesneon/Ciel	Agent	1	8d ago	Apache-2.0	A	32	Claude Code
rust-reviewerleandrosilvaferreira/claude-plugins-registry	Agent	9	4d ago	none	A	44	Claude Code
cicd-devopsbug-ops/claude-plugins	Agent	12	14d ago	none	A	79	Claude Code
rust-prodotclaude/marketplace	Agent	43	7mo ago	MIT	A	59	Claude Code
android-kotlin-corekrutikJain/android-agent-skills	Agent	14	7mo ago	MIT	A	31	Claude Code

RIPDPI: Agent for Claude Code