thoughtbox:session-review

thoughtbox:session-review is a skill for Claude Code from Kastalien-Research/thoughtbox. It costs 97 tokens per session (1,377 once invoked), scanned A, original, MIT.

A review process for completed Thoughtbox reasoning sessions, where Thoughtbox is a tool for recording and exploring structured thinking. It measures how the session unfolded and extracts reusable patterns, mistakes, and lessons for a knowledge graph, a connected store of information.

In plain words
What is it for?
Use it after a reasoning session to assess its quality, understand what worked, and record lessons for later decisions.
Why use it?
It turns past reasoning into material that can improve future work. It helps identify abandoned sessions, excessive course corrections, unproductive branches, and useful decision patterns.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter. Also seen: installed under .agents/ (shared by several agents).

Good fit Use it after a reasoning session to assess its quality, understand what worked, and record lessons for later decisions.

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Install with agentmods
npx agentmods add skills/kastalien-research/thoughtbox/thoughtbox-session-review
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 Kastalien-Research/thoughtbox --skill thoughtbox-session-review
Clone the repo
git clone --depth 1 https://github.com/Kastalien-Research/thoughtbox

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.

agentmods badge for thoughtbox:session-review

README.md
[![agentmods](https://agentmods.dev/badge/skills/kastalien-research/thoughtbox/thoughtbox-session-review/github.svg)](https://agentmods.dev/skills/kastalien-research/thoughtbox/thoughtbox-session-review)
Your own site
<a href="https://agentmods.dev/skills/kastalien-research/thoughtbox/thoughtbox-session-review"><img src="https://agentmods.dev/badge/skills/kastalien-research/thoughtbox/thoughtbox-session-review/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 thoughtbox:session-review

Your own site · 80×15
<a href="https://agentmods.dev/skills/kastalien-research/thoughtbox/thoughtbox-session-review"><img src="https://agentmods.dev/badge/skills/kastalien-research/thoughtbox/thoughtbox-session-review.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 97 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,377 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 5.1 $0.00097 $0.01377
Opus 5 $0.00048 $0.00688
Sonnet 5 $0.00019 $0.00275
Haiku 4.5 $0.00010 $0.00138

Measured 9d ago against content hash a7e485ce0a25, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

thoughtbox:session-review 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 9d 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.

.agents/skills/thoughtbox-session-review/SKILL.md · 184 lines

How it starts

The opening of the file, as written. The whole thing — 184 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Thoughtbox Session Review

Sessions are write-once without review. This skill turns completed sessions into reusable knowledge by identifying what worked, what didn't, and what to carry forward.

Workflow

Phase 1: Retrieve and Measure

Find the session and get structural metrics:

// thoughtbox_execute — find the session
async () => {
  // By ID:
  const session = await tb.session.get("session-uuid");
  // Or find latest:
  const list = await tb.session.list({ limit: 1 });
  return list;
}
// Get structural metrics
async () => {
  const analysis = await tb.session.analyze("session-uuid");
  return analysis;
  // Returns: linearityScore, revisionRate, maxDepth, thoughtDensity,
  //          critiqueRequests, hasConvergence, isComplete
}

Interpret the metrics:

Metric High value means Look for
revisionRate > 0.15 Many course corrections Anti-patterns — what kept going wrong?
linearityScore < 0.7 Heavy branching Exploration strategies — were branches productive?
hasConvergence = true Branches resolved Decision patterns — how was the choice made?
isComplete = false Session abandoned Why? Context loss? Stuck? Deprioritized?

Phase 2: Identify Key Moments

Retrieve the full session and scan for signal thoughts:

async () => {
  const session = await tb.session.get("session-uuid");
  return session.thoughts;
}

Scan for these moment types:

  • Pivots — reasoning direction changed. Look for: "actually", "wait", "on second thought", significant topic shift
  • Decisions — uncertainty resolved. Look for: "choosing", "decided", "going with", comparison conclusions
  • Insights — synthesis occurred. Look for: "this means", "the pattern is", "I see now", connections between ideas
  • Revisions — corrections made. Check isRevision: true field
  • Branch points — exploration diverged. Check branchFromThought field

Read the full file on GitHub · 184 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.

  1. 9d ago First seen · 184 lines · 97 tokens per session scan A a7e485ce0a25

Subscribe to this mod's changes

thoughtbox:session-review is a skill published in the GitHub repository Kastalien-Research/thoughtbox (64 stars, last pushed 1mo ago), licensed MIT. It adds 97 tokens to every session and 1,377 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 2026-08-30.

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