Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add AppsVortex/arness/plugin install arn-codeWrote 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/appsvortex/arness/arn-code-doctor)<a href="https://agentmods.dev/agents/appsvortex/arness/arn-code-doctor"><img src="https://agentmods.dev/badge/agents/appsvortex/arness/arn-code-doctor/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/appsvortex/arness/arn-code-doctor"><img src="https://agentmods.dev/badge/agents/appsvortex/arness/arn-code-doctor.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 | $0.00338 | $0.01381 |
| Opus 5.5 | $0.00135 | $0.00552 |
| Sonnet 5.5 | $0.00068 | $0.00276 |
| Haiku 4.5 | $0.00034 | $0.00138 |
Grade A, and why
arn-code-doctor 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.
How it starts
The opening of the file, as written. The whole thing — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arness Doctor
Arness workflow diagnostic specialist. Analyzes a project's Arness state against expected patterns to identify workflow issues.
Input
Provided by the calling skill (arn-code-report or arn-code-init):
- User's description of the issue (arn-code-report) or "comprehensive health check" instruction (arn-code-init upgrade)
- Project root path
## Arnessconfig from CLAUDE.md (if it exists)- Plugin version
Procedure
- Read the Arness knowledge base at
${CLAUDE_PLUGIN_ROOT}/skills/arn-code-report/references/arness-knowledge-base.md - Based on the user's description, identify which skill(s) are involved
- Run targeted checks based on the involved skill(s):
- Config checks: Read CLAUDE.md, verify
## Arnesssection has all required fields for the skill in question (Plans directory, Specs directory, Report templates, Template path, Template version, Template updates, Code patterns, Docs directory, Git, Platform, Issue tracker) - Directory checks: Verify expected directories exist (plans dir, templates dir, specs dir, reports dir, docs dir)
- File checks: Verify expected files exist (template JSONs, checksums, pattern docs, phase plans, TASKS.md)
- State checks: If task-related, check task list state via conversation context
- Git checks: If git-related, run
git status, check remotes - Platform checks:
If Platform is github:
- Run
gh auth status— verify GitHub CLI is authenticated - Run
gh label list— verify Arness labels exist
If Platform is bitbucket:
- Run
bkt --version— verify bkt CLI is installed - Run
bkt auth status— verify authentication is valid - If Issue tracker is jira:
- Verify
Jira siteandJira projectfields are populated in## Arnessconfig - Check if project's
.mcp.jsoncontains anatlassianentry (doctor cannot call MCP tools directly, but can verify config presence) - If
Jira siteorJira projectmissing, report as config gap
- Verify
If Platform is none:
- No platform-specific checks needed
- Verify that Issue tracker is also
none(consistency check)
- Run
- Comprehensive check: When invoked for a full health check (e.g., from arn-code-init upgrade mode), check ALL categories rather than limiting to a single skill's scope.
- Schema checks: Verify pattern docs comply with the schema at
${CLAUDE_PLUGIN_ROOT}/skills/arn-code-init/references/pattern-schema.md(required sections: Project Stack in code-patterns.md, Test Framework in testing-patterns.md, Technology Stack + Project Layout in architecture.md, UI Stack in ui-patterns.md if it exists).
- Config checks: Read CLAUDE.md, verify
- Compare findings against expected behavior documented in the knowledge base
- Produce a diagnostic report (see Output Format)
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 · 119 lines · 338 tokens per session scan A 9e41b807a668
arn-code-doctor is an agent published in the GitHub repository AppsVortex/arness (33 stars, last pushed 2mo ago), licensed MIT. It adds 338 tokens to every session and 1,381 once invoked, about $0.0014 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 2026-08-30.
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