common-session-retrospective

common-session-retrospective is a skill for Claude Code, Codex from HoangNguyen0403/agent-skills-standard. It costs 59 tokens per session (720 once invoked), scanned A, original, MIT.

A process for reviewing a conversation after the user has corrected the agent, requested rework, or asked for a retrospective. It identifies the cause of the problem, checks whether a relevant skill was missed, and prepares focused library-maintenance work when authorized.

In plain words
What is it for?
Use it to analyze user corrections, classify what went wrong, record learning entries, and report which skills or instructions should be improved.
Why use it?
It helps prevent the same correction loop from happening again. It separates missing skills, incomplete instructions, triggering mistakes, and workflow gaps.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents); mentions AGENTS.md.

Good fit Use it to analyze user corrections, classify what went wrong, record learning entries, and report which skills or instructions should be improved.

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Install with agentmods
npx agentmods add skills/hoangnguyen0403/agent-skills-standard/common-session-retrospective
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 HoangNguyen0403/agent-skills-standard --skill common-session-retrospective
Clone the repo
git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard

Made for: Claude Code, Codex.

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 common-session-retrospective

README.md
[![agentmods](https://agentmods.dev/badge/skills/hoangnguyen0403/agent-skills-standard/common-session-retrospective/github.svg)](https://agentmods.dev/skills/hoangnguyen0403/agent-skills-standard/common-session-retrospective)
Your own site
<a href="https://agentmods.dev/skills/hoangnguyen0403/agent-skills-standard/common-session-retrospective"><img src="https://agentmods.dev/badge/skills/hoangnguyen0403/agent-skills-standard/common-session-retrospective/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 common-session-retrospective

Your own site · 80×15
<a href="https://agentmods.dev/skills/hoangnguyen0403/agent-skills-standard/common-session-retrospective"><img src="https://agentmods.dev/badge/skills/hoangnguyen0403/agent-skills-standard/common-session-retrospective.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 59 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 720 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 $0.00059 $0.00720
Opus 5 $0.00030 $0.00360
Sonnet 5 $0.00012 $0.00144
Haiku 4.5 $0.00006 $0.00072

Measured 12d ago against content hash 3df013c2f737, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

common-session-retrospective 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 12d 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/common/common-session-retrospective/SKILL.md · 72 lines

How it starts

The opening of the file, as written. The whole thing — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Session Retrospective

Priority: P1 (HIGH)

Structure

common/session-retrospective/
├── SKILL.md              # Protocol (this file)
└── references/
    └── methodology.md    # Signal tables, taxonomy, report template

Protocol

  1. Extract — Scan for correction signals (loops, rejections, shape mismatches, lint rework)
  2. Classify — Root cause: Skill Missing | Incomplete | Example Contradicts Rule | Workflow Gap | Trigger Miss
  3. Trigger Miss Check — For every task in session, ask: " relevant skill available but not loaded?"
  • If yes: record skill ID, indirect phrase used, and fix (add keyword alias to triggers)
  1. Propose — One fix per root cause: revise existing guidance, update reference, add new skill, or add new workflow
  2. Implement — Only when current task explicitly authorizes repository maintenance, apply the approved repo changes across configured agent dirs. Keep SKILL.md concise; move large tables to references/. Update AGENTS.md
  3. Log to AGENTS_LEARNING.md — For each correction loop found, append one entry using common/common-learning-log protocol (Signal: Session retrospective)
  4. Report — Output correction count, skills changed, trigger misses found, estimated rounds saved

Trigger Miss Output

Emit trigger miss block (schema in references/methodology.md) for each miss detected.

Guidelines

  • Cite specifics: Reference concrete conversation moment per proposal
  • Extend first: Search AGENTS.md before creating — extend existing guidance first
  • One fix per loop: One correction → one targeted skill change
  • Stay task-scoped: Only change repository library source during explicit maintenance work for the repository
  • Sync all agents: Apply to every agent skill dir listed in .skillsrc agents field
  • Follow skill-creator: New skills comply with common/skill-creator standards

Anti-Patterns

  • No Vague Proposals: Cite exact gap + fix, not "make X better"
  • No Duplicate Skills: Search AGENTS.md index first
  • No Oversized Patches: Extract to references/ per skill-creator standard

Read the full file on GitHub · 72 lines

Files

What ships with it

1 file 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.

  1. 12d ago First seen · 72 lines · 59 tokens per session scan A 3df013c2f737

Subscribe to this mod's changes

common-session-retrospective is a skill published in the GitHub repository HoangNguyen0403/agent-skills-standard (565 stars, last pushed 3d ago), licensed MIT. It adds 59 tokens to every session and 720 once invoked, about $0.0003 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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