What is prism CLAUDE.md?

Project instructions for Prism, a command-line tool that examines Claude Code sessions and reports on their health.

Use them when modifying Prism's session parsing, analysis, recommendations, CLI, terminal interface, or HTML dashboard.

They explain the project's architecture, data sources, metrics, and expected locations for making changes safely.

How jakeefr/prism configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to jakeefr/prism. 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/jakeefr/prism/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/jakeefr/prism

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/instructions/jakeefr/prism/claude-md/github.svg)](https://agentmods.dev/instructions/jakeefr/prism/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/jakeefr/prism/claude-md"><img src="https://agentmods.dev/badge/instructions/jakeefr/prism/claude-md/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/instructions/jakeefr/prism/claude-md"><img src="https://agentmods.dev/badge/instructions/jakeefr/prism/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 917 This file is loaded in full into every session.

When invoked 917 The same file — it is already loaded in full.

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	$0.00917	$0.00917
Opus 5.5	$0.00367	$0.00367
Sonnet 5.5	$0.00183	$0.00183
Haiku 4.5	$0.00092	$0.00092

Measured 2mo ago against content hash 68173a75d79f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

prism CLAUDE.md 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 2mo 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.

CLAUDE.md · 93 lines

How it starts

The opening of the file, as written. The whole thing — 93 lines — stays where its author put it; the contents beside it link to each section on GitHub.

PRISM

Post-session diagnostic CLI for Claude Code. Parses session data, scores it across five health dimensions, and surfaces actionable fixes via a CLI report, interactive TUI, or HTML dashboard.

Health Dimensions

Token Efficiency — compaction rate, token waste, CLAUDE.md bloat
Tool Health — retry loops, interactive commands, migration edits, consecutive failures
Context Hygiene — compaction frequency, mid-task compaction, context pressure
CLAUDE.md Adherence — rule extraction, violation detection, attention curve
Session Continuity — truncation, context loss across continuations

Architecture

JSONL files ─┐
             ├─ SessionDataSource ─→ analyzer ─→ advisor ─→ CLI / TUI / dashboard
agentsview DB┘

The SessionDataSource protocol (datasource.py) abstracts over two backends:

JSONLDataSource — reads raw .jsonl session files from ~/.claude/projects/
AgentsviewDataSource — reads from the agentsview SQLite DB

The parser produces typed records (UserRecord, AssistantRecord, SystemRecord). The analyzer computes metrics from those records. The advisor generates CLAUDE.md recommendations from the metrics. The CLI, TUI, and dashboard are thin presentation layers.

Key Files

File	Purpose
`prism/parser.py`	JSONL parsing, record dataclasses. No analysis.
`prism/analyzer.py`	All metrics computation. No I/O (except CLAUDE.md read).
`prism/advisor.py`	Recommendation generation from analyzer output.
`prism/datasource.py`	`SessionDataSource` protocol + `JSONLDataSource`.
`prism/agentsview.py`	`AgentsviewDataSource` — SQLite adapter for agentsview.
`prism/cli.py`	Typer CLI. Thin layer calling analyzer/advisor/app.
`prism/app.py`	Textual TUI. Imports widgets from `prism/widgets/`.
`prism/dashboard.py`	Single-file HTML dashboard generator.

Data Sources

JSONL (default):

prism analyze                          # reads ~/.claude/projects/
prism analyze --base-dir /other/path   # override base directory
prism analyze --project /path/to/proj  # single project

Read the full file on GitHub · 93 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.

2mo ago First seen · 93 lines · 917 tokens per session scan A 68173a75d79f

Subscribe to this mod's changes

prism CLAUDE.md is an instructions file published in the GitHub repository jakeefr/prism (21 stars, last pushed 5mo ago), licensed MIT. It adds 917 tokens to every session, about $0.0037 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.

prism CLAUDE.md next to 6 instructions from other repositories
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prism CLAUDE.mdjakeefr/prism	Instructions file	21	5mo ago	MIT	A	917	Claude Code
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prism: Instructions file for Claude Code