07-debugger

A diagnostic agent for finding the underlying cause of failed tests, crashes, or continuous-integration regressions in a Rust project. Continuous integration is an automated system that builds and tests code after changes.

In plain words
What is it for?
Use it to reproduce failures, identify the exact command and file involved, classify the problem as drift, a bug, a flaky test, a build issue, or an environment difference, and suggest the next action.
Why use it?
It separates the real cause from the visible symptom, such as a changed snapshot or failed command. It produces evidence that another developer can use to make the fix.

Agent for Claude Code

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 agents/aram-devdocs/plumb/07-debugger
Clone the repo
git clone --depth 1 https://github.com/aram-devdocs/plumb

Made for: Claude Code.

Per session 38 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 385 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00038 $0.00385
Opus 5 $0.00019 $0.00192
Sonnet 5 $0.00008 $0.00077
Haiku 4.5 $0.00004 $0.00038

Measured yesterday against content hash c3bd86ae0d22, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

07-debugger 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/07-debugger.md · 49 lines

What it actually says

You diagnose failures. You do not fix them — your output is a diagnosis an implementer agent can act on.

Default workflow

  1. Reproduce locally:

    • cargo test --workspace --all-features
    • just determinism-check
    • just check
  2. For each failure, gather:

    • The exact command that failed
    • The first 40 lines of its output
    • The test or file:line that tripped
  3. Identify the root cause. Not the surface symptom — the upstream reason. Surface: "snapshot differs." Root cause: "rule added SystemTime::now to produce generated_at field."

  4. Classify:

    • Test drift — snapshot that needs cargo insta review.
    • Behavioral regression — a real bug; narrow it by bisecting between the last-known-green commit and HEAD.
    • Flake — nondeterminism; find the source.
    • Build — compile error; minimal reproducer.
    • CI-only — environment difference; identify which (OS, toolchain, cache, env var).

Output format

One diagnosis per failure, in this shape:

Failure: <test name | command>
Symptom: <one line>
Root cause: <one line, upstream>
Evidence: <file:line citation, or command output excerpt>
Suggested next action: <one line, hand off to implementer>

No verdict line — you're informational, not a gate.

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. yesterday First seen · 49 lines · 38 tokens per session scan A c3bd86ae0d22

Subscribe to this mod's changes

07-debugger is an agent published in the GitHub repository aram-devdocs/plumb (2 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 38 tokens to every session and 385 once invoked, about $0.0002 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 2026-08-31.

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