Agent skill

Session Brain

Build or refresh a browser-viewable topic graph over Claude session history using local clustering.

MITAuto-check passedKnowledge Management

Install Session Brain

skills CLI

$ npx skills add Ar9av/obsidian-wiki --skill session-brain -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install Ar9av/obsidian-wiki session-brain --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/Ar9av/obsidian-wiki.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.skills/session-brain .claude/skills/session-brain && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "session-brain" agent skill from https://github.com/Ar9av/obsidian-wiki/tree/main/.skills/session-brain into .claude/skills/session-brain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "session-brain", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/Ar9av/obsidian-wiki/tree/main/.skills/session-brain

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add Ar9av/obsidian-wiki --skill session-brain -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install Ar9av/obsidian-wiki session-brain --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Ar9av/obsidian-wiki.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.skills/session-brain .agents/skills/session-brain && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "session-brain" agent skill from https://github.com/Ar9av/obsidian-wiki/tree/main/.skills/session-brain into .agents/skills/session-brain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "session-brain", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add Ar9av/obsidian-wiki --skill session-brain -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install Ar9av/obsidian-wiki session-brain --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Ar9av/obsidian-wiki.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.skills/session-brain .cursor/skills/session-brain && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "session-brain" agent skill from https://github.com/Ar9av/obsidian-wiki/tree/main/.skills/session-brain into .cursor/skills/session-brain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "session-brain", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/Ar9av/obsidian-wiki.git --path .skills/session-brain

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add Ar9av/obsidian-wiki --skill session-brain -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install Ar9av/obsidian-wiki session-brain --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Ar9av/obsidian-wiki.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.skills/session-brain .gemini/skills/session-brain && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "session-brain" agent skill from https://github.com/Ar9av/obsidian-wiki/tree/main/.skills/session-brain into .gemini/skills/session-brain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "session-brain", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install Ar9av/obsidian-wiki session-brain

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add Ar9av/obsidian-wiki --skill session-brain -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/Ar9av/obsidian-wiki.git skills-src && mkdir -p .github/skills && cp -r skills-src/.skills/session-brain .github/skills/session-brain && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "session-brain" agent skill from https://github.com/Ar9av/obsidian-wiki/tree/main/.skills/session-brain into .github/skills/session-brain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "session-brain", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add Ar9av/obsidian-wiki --skill session-brain -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install Ar9av/obsidian-wiki session-brain --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Ar9av/obsidian-wiki.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.skills/session-brain .opencode/skills/session-brain && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "session-brain" agent skill from https://github.com/Ar9av/obsidian-wiki/tree/main/.skills/session-brain into .opencode/skills/session-brain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "session-brain", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: session-brain
GitHub stars: 3.5k
Token cost: ~989 tokens
SKILL.md length: 483 words
Files: 1
Skills in repo: 39
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Build or refresh a browser-viewable topic graph over Claude session history using local clustering.

Works in 3 steps: Build → Name the unnamed clusters → Report the map
Clustering sessions
SKILL.md covers When to use which skill, Step 1: Build, Step 2: Name the unnamed… and Step 3: Report the map, plus 1 more section
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Session Brain is an agent skill from Ar9av/obsidian-wiki. Build or refresh a browser-viewable topic graph over Claude session history using local clustering. Use for mapping or clustering sessions, recent or stale topic analysis, or rebuilding/showing the session graph. Unlike wiki-history-ingest, it indexes raw sessions and never writes to the vault.

Its SKILL.md is about 990 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Knowledge Management. The repository describes itself as: Framework for AI agents to build and maintain a digital brain through Obsidian wiki | Memory System for Agents. The licence is MIT.

When your agent uses it

Clustering sessions
Stale topic analysis
Rebuilding/showing the session graph

Example prompts

“/session-brain”

Requirements

Python 3

Workflow steps

3 steps, taken from the step headings in SKILL.md.

Build
Name the unnamed clusters
Report the map

What it can do on your machine

Read from SKILL.md and the folder at commit 709727e. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Session Brain loads about 989 tokens when it runs. Until then it costs about 77 tokens; SKILL.md has 483 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~77
When it runs · the whole SKILL.md, loaded when a task matches: ~989

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from Ar9av/obsidian-wiki at commit 709727e, republished under its MIT licence (© Ar9av). 483 words, ~989 tokens.

Download SKILL.mdSave it as .claude/skills/session-brain/SKILL.md (or your agent's skills folder).

name: session-brain
description: Build or refresh a browser-viewable topic graph over Claude session history using local clustering. Use for mapping or clustering sessions, recent or stale topic analysis, or rebuilding/showing the session graph. Unlike wiki-history-ingest, it indexes raw sessions and never writes to the vault.

Session Brain

Builds a searchable topic graph over your agent session history. The output is a sidecar at ~/.claude/session-brain/ — the vault is never touched.

All the heavy lifting is deterministic Python in the obsidian-wiki CLI. Your only job is to name the clusters, which takes exactly one turn and requires reading no transcripts.

When to use which skill

Goal	Skill
Build or refresh the graph; survey topics	`session-brain` (this one)
Find and load a specific past session	`session-search`
Distil sessions into permanent vault pages	`wiki-history-ingest` / `claude-history-ingest`

Step 1: Build

bash

obsidian-wiki sessions-build --json

Roughly 3 seconds cold on ~1000 sessions, well under a second incrementally — it re-reads only transcripts whose size or mtime changed. Useful flags:

Flag	When
`--full`	Ignore all caches and re-read everything
`--mutual`	Tighter, smaller clusters (mutual-kNN edges only)
`--half-life N`	Change the recency half-life (default 90 days)
`--min-sim 0.15`	Fewer, stronger edges — use if the graph is too dense to read
`--skip name`	Exclude a project. Match is substring-based; pass the bare name, because cache dirs start with `-` and argparse reads that as a flag

Report the headline numbers: total sessions, how many have transcripts vs. are history-only, edges, and cluster count.

Step 2: Name the unnamed clusters

bash

obsidian-wiki sessions-clusters --unnamed --json

Each cluster comes with top_terms and exemplars (its three highest-degree sessions, whose titles are already in graph.json). That is all you need. Do not open transcripts to name a cluster — the whole design goal is that naming costs one turn regardless of corpus size.

Write a 3–5 word name and a one-sentence summary per cluster, then:

bash

obsidian-wiki sessions-name --from - <<'EOF'
[{"id": 3, "name": "warden telemetry pipeline", "summary": "Building and debugging the redacted telemetry chain."}]
EOF

Names are stored in names.json keyed by the cluster's dominant vocabulary, not its id — so they survive rebuilds even though cluster ids are positional and shift as the corpus grows. On repeat runs --unnamed is usually empty and this step is free.

If a cluster's terms are genuinely incoherent, name it honestly ("mixed — short sessions") rather than inventing a theme.

Show full SKILL.md (169 more words)Show less

Step 3: Report the map

Read clusters.json and tell the user:

Biggest topics — by size
What's hot — highest momentum (activity in the last 30 days vs. the 60 before it)
What's gone quiet — dormant: true (low recency and nothing in 60 days)
Where topics meet — bridges, the sessions that connect two otherwise separate topics. These are often the most interesting sessions in the graph.

Then offer the visualisation:

bash

open ~/.claude/session-brain/graph.html

Node size is session length, brightness is recency, hollow rings are history-only sessions, and gold borders are bookmarked ones. The time slider and search box filter together.

Notes

Never write to the vault from this skill. If the user wants session knowledge in the vault, that is wiki-history-ingest.
History-only sessions are real. Roughly 40% of a long-lived cache exists only as prompts in history.jsonl; those get graph nodes and are findable, but can never be loaded. Say so plainly rather than implying they are missing.
The graph is derived data. If it looks wrong, --full rebuilds from scratch; nothing is lost.

Files

Just SKILL.md in .skills/session-brain of Ar9av/obsidian-wiki.

Open the folder on GitHubat commit 709727e

Compare with similar skills

Session Brain next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Session Brain compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Session Brain this skillAr9av/obsidian-wiki	3.5k	—	~989	Automated safety check: Pass	MIT	today
Baoyu URL To Markdownsdyckjq-lab/llm-wiki-skill	2.5k	3 repos	~3.2k	Automated safety check: Pass	None	2 mo ago
Logseq Review Workflow Evallogseq/logseq	45k	—	~1k	Automated safety check: Pass	AGPL-3.0	today
Obsidian CLIAtmosphere/atmosphere	3.8k	13 repos	~795	Automated safety check: Pass	Apache-2.0	yesterday
Esm Cjs Risk Scanlogseq/logseq	45k	—	~3.3k	Automated safety check: Pass	AGPL-3.0	today
Capture Conversationoutline/outline	41k	—	~474	Automated safety check: Pass	Custom licence	today

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Questions about Session Brain

What does Session Brain do?

Build or refresh a browser-viewable topic graph over Claude session history using local clustering. Session Brain is an agent skill from Ar9av/obsidian-wiki. Build or refresh a browser-viewable topic graph over Claude session history using local clustering.

When should I use Session Brain?

Session Brain fits situations like: clustering sessions; stale topic analysis; rebuilding/showing the session graph.

How do I install Session Brain in Claude Code?

Run `npx skills add Ar9av/obsidian-wiki --skill session-brain -a claude-code`. Or copy the skill folder (.skills/session-brain in Ar9av/obsidian-wiki) into .claude/skills/session-brain in your project. Claude Code loads it when a task matches its description.

How do I install Session Brain in Codex?

Run `npx skills add Ar9av/obsidian-wiki --skill session-brain -a codex`. Or copy the skill folder (.skills/session-brain in Ar9av/obsidian-wiki) into .agents/skills/session-brain in your project. Codex loads it when a task matches its description.

Can I use Session Brain in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Ar9av/obsidian-wiki --skill session-brain -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/session-brain, .gemini/skills/session-brain, .github/skills/session-brain and .opencode/skills/session-brain in your project.

What does Session Brain need to run?

SKILL.md names no scripts, command-line tools or credentials: Session Brain is instructions for the agent only. Our summary lists: Python 3.

Does Session Brain access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Session Brain safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Session Brain use?

Session Brain is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Session Brain use?

About 989 tokens (SKILL.md is roughly 4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Session Brain?

Skills that share tags, products or a category with Session Brain: Baoyu URL To Markdown (sdyckjq-lab/llm-wiki-skill, 2.5k stars), Logseq Review Workflow Eval (logseq/logseq, 45k stars), Obsidian CLI (Atmosphere/atmosphere, 3.8k stars) and Esm Cjs Risk Scan (logseq/logseq, 45k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Session Brain?

Ar9av (a GitHub user) maintains it in Ar9av/obsidian-wiki, which has 3,532 GitHub stars. The repository holds 39 skills in this directory. The repository was last updated on October 7, 2026.

Source: Ar9av/obsidian-wiki on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Session Brain

Install Session Brain

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Session Brain

When to use which skill

Step 1: Build

Step 2: Name the unnamed clusters

Step 3: Report the map

Notes

Files

Compare with similar skills

Similar skills

Baoyu URL To Markdown

Logseq Review Workflow Eval

Obsidian CLI

Esm Cjs Risk Scan

Capture Conversation

Karpathy LLM Wiki

More from Ar9av/obsidian-wiki

Hermes History Ingest

Codex History Ingest

Copilot History Ingest

Obsidian Layout Adjustment

Openclaw History Ingest

Wiki Capture

Questions about Session Brain

Install Session Brain

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Session Brain

When to use which skill

Step 1: Build

Step 2: Name the unnamed clusters

Step 3: Report the map

Notes

Files

Compare with similar skills

Similar skills

More from Ar9av/obsidian-wiki

Related

Questions about Session Brain