inbox-processing-expert

inbox-processing-expert is a skill for Claude Code from nathanvale/side-quest-marketplace-old. It costs 142 tokens per session (6,200 once invoked), scanned B, original, no licence file.

Guidance for building a secure system that processes PDFs and other attachments from an Obsidian inbox with AI-assisted metadata extraction.

In plain words
What is it for?
Use it when implementing or maintaining inbox processors, including protections against timing-of-check issues and command injection.
Why use it?
It helps prevent security and reliability problems when automated agents handle untrusted files and commands.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Part of the dev-toolkit plugin — 8 skills, 1 command shipped together

Good fit Use it when implementing or maintaining inbox processors, including protections against timing-of-check issues and command injection.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/nathanvale/side-quest-marketplace-old/inbox-processing-expert
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.

Any agent
npx skills add nathanvale/side-quest-marketplace-old --skill inbox-processing-expert
Clone the repo
git clone --depth 1 https://github.com/nathanvale/side-quest-marketplace-old

Made for: Claude Code.

Or install dev-toolkit, the plugin that ships this one along with the rest of its 8 skills, 1 command.

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 inbox-processing-expert

README.md
[![agentmods](https://agentmods.dev/badge/skills/nathanvale/side-quest-marketplace-old/inbox-processing-expert/github.svg)](https://agentmods.dev/skills/nathanvale/side-quest-marketplace-old/inbox-processing-expert)
Your own site
<a href="https://agentmods.dev/skills/nathanvale/side-quest-marketplace-old/inbox-processing-expert"><img src="https://agentmods.dev/badge/skills/nathanvale/side-quest-marketplace-old/inbox-processing-expert/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 inbox-processing-expert

Your own site · 80×15
<a href="https://agentmods.dev/skills/nathanvale/side-quest-marketplace-old/inbox-processing-expert"><img src="https://agentmods.dev/badge/skills/nathanvale/side-quest-marketplace-old/inbox-processing-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 142 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 6,200 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 2 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00142 $0.06200
Opus 5 $0.00071 $0.03100
Sonnet 5 $0.00028 $0.01240
Haiku 4.5 $0.00014 $0.00620

Measured 10d ago against content hash abac6958c731, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade B, and why

inbox-processing-expert scanned grade B with 2 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 10d 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.

Reads agent configuration directorieslowAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

grep "abc12345" ~/.claude/logs/para-obsidian.jsonl

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Recursive force deletemediumDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

const maliciousPath = "/tmp/file.pdf; rm -rf /";

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

plugins/dev-toolkit/skills/inbox-processing-expert/SKILL.md · 938 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 10d ago First seen · 938 lines · 142 tokens per session scan B abac6958c731

Subscribe to this mod's changes

inbox-processing-expert is a skill published in the GitHub repository nathanvale/side-quest-marketplace-old (6 stars, last pushed 7mo ago), with no licence file. It adds 142 tokens to every session and 6,200 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it B with 2 findings (reads agent configuration directories, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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