Borrowing it
Nothing to install: this file belongs to Vvkmnn/claude-historian-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Vvkmnn/claude-historian-mcp/master/.claude/skills/claude-historian/SKILL.mdgit clone --depth 1 https://github.com/Vvkmnn/claude-historian-mcpWrote 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.
[](https://agentmods.dev/skills/vvkmnn/claude-historian-mcp/claude-historian)<a href="https://agentmods.dev/skills/vvkmnn/claude-historian-mcp/claude-historian"><img src="https://agentmods.dev/badge/skills/vvkmnn/claude-historian-mcp/claude-historian/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.
<a href="https://agentmods.dev/skills/vvkmnn/claude-historian-mcp/claude-historian"><img src="https://agentmods.dev/badge/skills/vvkmnn/claude-historian-mcp/claude-historian.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00043 | $0.00633 |
| Opus 5.5 | $0.00017 | $0.00253 |
| Sonnet 5.5 | $0.00009 | $0.00127 |
| Haiku 4.5 | $0.00004 | $0.00063 |
Grade A, and why
claude-historian 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 51 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Claude Historian
Search conversation history before starting fresh. You may already have the answer.
When to Use
Before WebSearch → search(query: "...", scope: "similar") or search(query: "...", scope: "conversations"). Past solutions beat web results.
Stuck on an error → search(query: "<error message>", scope: "errors"). Finds past fixes with code.
Entering a familiar project → search(scope: "sessions") for recent work. search(query: "...", scope: "plans") for past decisions.
Working on a familiar file → search(scope: "files", filepath: "src/index.ts"). Shows past changes with context.
Quick Reference
| Situation | Tool Call |
|---|---|
| Error with no obvious cause | search(query: "<error>", scope: "errors") |
| "Have I done this before?" | search(query: "...", scope: "similar") |
| Working on familiar file | search(scope: "files", filepath: "...") |
| Need past design reasoning | search(query: "...", scope: "plans") |
| What did I do last session? | search(scope: "sessions") |
| Successful tool workflows | search(scope: "tools") |
| General search | search(query: "...", scope: "conversations") |
| Deep-dive into session | inspect(session_id: "...") |
| Rules, skills, CLAUDE.md | search(query: "...", scope: "config") |
| Task management history | search(query: "...", scope: "tasks") |
| Memories across sessions | search(query: "...", scope: "memories") |
Key Parameters
scope: Target your search —conversations,errors,files,plans,config,tasks,similar,sessions,tools,memories, orall(default)limit: Number of results (default 10)project: Filter by project name substring (works with conversations, sessions)timeframe:today,yesterday,week,month
Common Mistakes
| Mistake | Fix |
|---|---|
| Going straight to WebSearch | Check historian first — past solutions are more relevant |
| Vague queries | Use specific terms: error messages, file paths, tool names |
Using scope: "all" for errors |
Use scope: "errors" — it has dedicated fix extraction |
| Long keyword-dump queries | Keep to 3-5 specific terms, not 10+ generic ones |
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.
- 1mo ago First seen · 51 lines · 43 tokens per session scan A d62c3d7d74c2
claude-historian is a skill published in the GitHub repository Vvkmnn/claude-historian-mcp (179 stars, last pushed 4mo ago), licensed MIT. It adds 43 tokens to every session and 633 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 2026-08-30.
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Manual reviewable prune of stale memory entries. Lists project entries older than 30 days with content preview; Frank decides per-entry [keep | archive | pin]. Keeps MEMORY.md under the auto-load 200-line truncation. Use when MEMORY.md exceeds 180 lines or session-end after a heavy work week.