history

history is a skill for Claude Code, Codex from Hmbown/Wizards-of-the-Ghosts. It costs 74 tokens per session (703 once invoked), scanned A, original, CC0-1.0.

A history-tracing skill for reconstructing how a codebase, system, incident, or decision reached its current state. It uses past records such as Git blame, changelogs, and event timelines.

In plain words
What is it for?
Use it to investigate old decisions, reconstruct production incidents, read change history, or prepare a post-mortem and root-cause analysis.
Why use it?
It provides context that is missing from legacy code or a current failure. Knowing why something changed can make later fixes and changes safer.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to investigate old decisions, reconstruct production incidents, read change history, or prepare a post-mortem and root-cause analysis.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/hmbown/wizards-of-the-ghosts/history
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 Hmbown/Wizards-of-the-Ghosts --skill history
Clone the repo
git clone --depth 1 https://github.com/Hmbown/Wizards-of-the-Ghosts

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 history

README.md
[![agentmods](https://agentmods.dev/badge/skills/hmbown/wizards-of-the-ghosts/history/github.svg)](https://agentmods.dev/skills/hmbown/wizards-of-the-ghosts/history)
Your own site
<a href="https://agentmods.dev/skills/hmbown/wizards-of-the-ghosts/history"><img src="https://agentmods.dev/badge/skills/hmbown/wizards-of-the-ghosts/history/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 history

Your own site · 80×15
<a href="https://agentmods.dev/skills/hmbown/wizards-of-the-ghosts/history"><img src="https://agentmods.dev/badge/skills/hmbown/wizards-of-the-ghosts/history.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 74 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 703 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 $0.00074 $0.00703
Opus 5 $0.00037 $0.00351
Sonnet 5 $0.00015 $0.00141
Haiku 4.5 $0.00007 $0.00070

Measured 9d ago against content hash 91ada93e491c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

history 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.

generated/hermes/investigation-and-preparation/history/SKILL.md · 67 lines

How it starts

The opening of the file, as written. The whole thing — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.

History

Trace how a system, decision, or codebase arrived at its current state.

What This Skill Does

In D&D, History recalls significant past events, legendary figures, and ancient knowledge. The real-world version is temporal investigation: git blame across the entire project, reading changelogs to understand why a decision was made, reconstructing the sequence of events that led to a production incident, or understanding organizational context that explains why the code looks the way it does. In this grimoire, History is treated as a metaphorical skill with a shipping-now delivery profile. Canonical reference input: History (skill).

When To Use

  • You need to understand why something is the way it is — not just what it does, but how it got here.
  • A post-mortem or root-cause analysis needs the timeline of events reconstructed.
  • Legacy code or legacy decisions need context before you can safely change them.

Prerequisites

  • No extra runtime dependencies beyond Hermes Agent and the normal toolset for this session.

Procedure

  1. Restate the target, the success condition, and any no-touch boundaries before taking action.
  2. Identify what you need the history of: a codebase, a decision, an incident, or an organizational pattern.
  3. Reconstruct the timeline: what happened, in what order, and what caused each transition.
  4. Identify the key decision points: where could things have gone differently, and why did they go this way?
  5. Deliver the historical narrative with a note on which parts are documented and which are reconstructed.
  6. Package the result as the deliverables below, with confidence, assumptions, and unresolved risk called out explicitly.

Deliverables

  • A timeline of the relevant history: events, decisions, and transitions in order.
  • Key decision points identified: what was decided, why, and what the alternatives were.
  • Context that explains the current state and constrains future changes.

Pitfalls / Guardrails

  • Keep the metaphor anchored to a real mechanism instead of drifting into lore.
  • History is reconstruction, not certainty. Always note where the record is incomplete or ambiguous.
  • Do not assume past decisions were wrong just because the current state is problematic. Context matters.

Read the full file on GitHub · 67 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 · 67 lines · 74 tokens per session scan A 91ada93e491c

Subscribe to this mod's changes

history is a skill published in the GitHub repository Hmbown/Wizards-of-the-Ghosts (107 stars, last pushed 5mo ago), licensed CC0-1.0. It adds 74 tokens to every session and 703 once invoked, about $0.0004 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 2026-09-03.

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