What is plugin-introspector?

A monitoring add-on for Claude Code workflow plugins. It records how plugins run, including tool use, API calls, token use, and execution patterns, then suggests improvements based on that data.

Use it to inspect plugin runs, review bottlenecks and anomalies, and produce concrete suggestions for improving plugin workflows.

It helps you find slow steps, unusual behaviour, quality problems, and wasted usage without relying only on guesses.

plugin-introspector — Skill for Claude Code by brody-0125

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 brody-0125/my-claude-skills --skill plugin-introspector

Clone the repo

git clone --depth 1 https://github.com/brody-0125/my-claude-skills

Made for: Claude Code.

Or install plugin-introspector, the plugin that ships this one along with the rest of its 4 skills.

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/skills/brody-0125/my-claude-skills/plugin-introspector/github.svg)](https://agentmods.dev/skills/brody-0125/my-claude-skills/plugin-introspector)

Your own site

<a href="https://agentmods.dev/skills/brody-0125/my-claude-skills/plugin-introspector"><img src="https://agentmods.dev/badge/skills/brody-0125/my-claude-skills/plugin-introspector/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/skills/brody-0125/my-claude-skills/plugin-introspector"><img src="https://agentmods.dev/badge/skills/brody-0125/my-claude-skills/plugin-introspector.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 90 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 6,832 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	$0.00090	$0.06832
Opus 5	$0.00045	$0.03416
Sonnet 5	$0.00018	$0.01366
Haiku 4.5	$0.00009	$0.00683

Measured 11d ago against content hash 1d0fb7e161f0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

plugin-introspector 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 11d ago.

The scan reads SKILL.md. This mod also ships 20 executable files (scripts/_common.sh, scripts/api-trace.sh, scripts/dashboard.sh, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

plugins/plugin-introspector/skills/plugin-introspector/SKILL.md · 593 lines

How it starts

The opening of the file, as written. The whole thing — 593 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Plugin Introspector — White-box Monitoring & Self-Improvement Meta-Plugin

A meta-plugin that monitors Claude Code workflow plugin execution at white-box level, collects execution data, and generates data-driven improvement proposals.

Role

A monitoring and analysis meta-plugin that provides end-to-end visibility into Claude Code workflow plugin execution. Collects tool traces, API interactions, token usage, and execution patterns via hooks. Provides analysis agents that identify bottlenecks, evaluate quality, detect anomalies, and generate concrete improvement proposals.

Terminology

Plugin: An installable package (directory with .claude-plugin/plugin.json and skills/)
Skill: An invocable unit within a plugin (directory with SKILL.md)
Agent: A Task subagent definition (.md file in agents/)
Proposal / Improvement: A concrete, ROI-scored change suggestion generated by improve

Core Principles

Data-driven improvement: Never guess — always base decisions on collected execution data
Minimal overhead: Hook scripts must complete in <50ms, use append-only JSONL
OTel compatibility: Trace data follows OpenTelemetry GenAI Semantic Conventions
Tiered collection: Tier 0 (pure hooks) → Tier 1 (+ OTel Collector with native telemetry)
Meta-rules compliance: All generated improvements must pass meta-rules validation
Zero external dependencies: bash + jq only — no Python, no Node.js (Tier 1 adds optional otelcol-contrib)

Pre-Execution: Session Resolution

Before any command, resolve the session directory:

1. Run: ls -t ~/.claude/plugin-introspector/sessions/ | head -1
   → Gives the most recent session ID
2. If --session {id} was provided: use that ID instead
3. Set: SESSION_DIR = ~/.claude/plugin-introspector/sessions/{resolved-id}
4. Verify: stats.json exists in SESSION_DIR
5. If not found: display "No session data. Run a session with hooks enabled first."

Full details: resources/orchestration-protocol.md

Read the full file on GitHub · 593 lines

Files

What ships with it

44 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

11d ago First seen · 593 lines · 90 tokens per session scan A 1d0fb7e161f0

Subscribe to this mod's changes

plugin-introspector is a skill published in the GitHub repository brody-0125/my-claude-skills (2 stars, last pushed 6mo ago), licensed MIT. It adds 90 tokens to every session and 6,832 once invoked, about $0.0005 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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