summarize-this-session

summarize-this-session is a skill for Claude Code from mayank-io/mstack. It costs 55 tokens per session (467 once invoked), scanned A, original, MIT.

A session-summary skill that recaps the current conversation, including progress, remaining work, and lessons learned.

In plain words
What is it for?
It is for summarizing completed work, next steps, mistakes, user corrections, and improvement ideas.
Why use it?
It creates a checkpoint when a task is paused or handed over, so important decisions and mistakes are not lost.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions CLAUDE.md.

Part of the dev plugin — 12 skills shipped together

Good fit It is for summarizing completed work, next steps, mistakes, user corrections, and improvement ideas.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/mayank-io/mstack/summarize-this-session
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 mayank-io/mstack --skill summarize-this-session
Clone the repo
git clone --depth 1 https://github.com/mayank-io/mstack

Made for: Claude Code.

Or install dev, the plugin that ships this one along with the rest of its 12 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.

agentmods badge for summarize-this-session

README.md
[![agentmods](https://agentmods.dev/badge/skills/mayank-io/mstack/summarize-this-session/github.svg)](https://agentmods.dev/skills/mayank-io/mstack/summarize-this-session)
Your own site
<a href="https://agentmods.dev/skills/mayank-io/mstack/summarize-this-session"><img src="https://agentmods.dev/badge/skills/mayank-io/mstack/summarize-this-session/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 summarize-this-session

Your own site · 80×15
<a href="https://agentmods.dev/skills/mayank-io/mstack/summarize-this-session"><img src="https://agentmods.dev/badge/skills/mayank-io/mstack/summarize-this-session.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 55 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 467 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00055 $0.00467
Opus 5.5 $0.00022 $0.00187
Sonnet 5.5 $0.00011 $0.00093
Haiku 4.5 $0.00006 $0.00047

Measured 2mo ago against content hash af49a5f7927d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

summarize-this-session 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.

plugins/dev/skills/summarize-this-session/SKILL.md · 55 lines

What it actually says

Summarize Current Conversation

Review everything that has happened in this conversation and produce a two-section summary.

Instructions

Look back through the entire conversation history — every user message, every tool call, every result, every correction.

Produce the following two sections:


Ongoing Task

Summarize the work in progress:

  • Initial Request: What the user originally asked for. State it clearly and concisely.
  • Progress Made: What has been accomplished so far. List concrete deliverables (files created, bugs fixed, features implemented, decisions made). Be specific — reference file paths, function names, and outcomes.
  • Next Steps: What remains to be done. If the task is complete, say so. If there are open questions or follow-ups, list them.

Continuous Improvement

Analyze the conversation for learning opportunities:

  • Mistakes Made by Claude: Actions Claude took that were wrong, suboptimal, or had to be redone. Include:

    • What happened
    • What the correct approach was
    • Why Claude got it wrong (wrong assumption, missing context, tool misuse, etc.)
  • Mistakes Pointed Out by Human: Corrections the user explicitly made. Include:

    • What the user corrected
    • What Claude was doing wrong
    • Whether this is a recurring pattern
  • Lessons Learned: Actionable takeaways from this conversation that would improve future sessions. These could be:

    • Workflow improvements
    • Tool usage patterns
    • Project-specific conventions discovered
    • Things that should be added to CLAUDE.md or memory
    • Skills or plugins that would have helped

Formatting Rules

  • Be honest and specific — don't gloss over mistakes or be vague
  • If there were no mistakes in a category, say "None" — don't fabricate issues
  • Keep each bullet concise but include enough detail to be actionable
  • Reference specific messages or tool calls when describing mistakes
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. 2mo ago First seen · 55 lines · 55 tokens per session scan A af49a5f7927d

Subscribe to this mod's changes

summarize-this-session is a skill published in the GitHub repository mayank-io/mstack (6 stars, last pushed 3d ago), licensed MIT. It adds 55 tokens to every session and 467 once invoked, about $0.0002 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 2026-08-31.

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