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since-last-session

since-last-session is a command for Claude Code from ARCASSystems/FounderOS. It costs 0 tokens per session (690 once invoked), scanned A, original, MIT.

A command that reports what changed in a Founder OS workspace since its previous run. Founder OS is a system that stores personal logs, commitments, and related work information in files.

In plain words
What is it for?
Use it to see elapsed time, new log entries, changed flags, overdue commitments, and other session updates.
Why use it?
It gives you a short catch-up after time away instead of requiring you to inspect those files manually.

Command for Claude Code

Part of the founder-os plugin — 95 skills, 45 commands, 6 hooks shipped together

not rated 5 21d ago A scan 0 tokens original MIT
View the source file ARCASSystems/FounderOS
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.

agentmods
npx agentmods add commands/arcassystems/founderos/since-last-session
Clone the repo
git clone --depth 1 https://github.com/ARCASSystems/FounderOS

Made for: Claude Code.

Or install founder-os, the plugin that ships this one along with the rest of its 95 skills, 45 commands, 6 hooks.

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 since-last-session

README.md
[![agentmods](https://agentmods.dev/badge/commands/arcassystems/founderos/since-last-session.svg)](https://agentmods.dev/commands/arcassystems/founderos/since-last-session)
Your own site
<a href="https://agentmods.dev/commands/arcassystems/founderos/since-last-session"><img src="https://agentmods.dev/badge/commands/arcassystems/founderos/since-last-session.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 690 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00000 $0.00690
Opus 5 $0.00000 $0.00345
Sonnet 5 $0.00000 $0.00138
Haiku 4.5 $0.00000 $0.00069

Measured 4d ago against content hash 891b8a2fd91a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

since-last-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 4d 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.

.claude/commands/since-last-session.md · 45 lines

How it starts

The opening of the file, as written. The whole thing — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Founder OS since last session

Run the since-last-session skill at skills/since-last-session/SKILL.md end to end. No arguments.

Procedure

  1. If core/identity.md does not exist, reply Founder OS not set up here. Say "set up Founder OS" first. and stop.
  2. If skills/since-last-session/SKILL.md is missing, reply since-last-session skill not found at skills/since-last-session/SKILL.md. Restarting Claude Code fixes this most of the time, because it reloads what is installed. If it happens again after a restart, say "update Founder OS". and stop.
  3. If brain/ does not exist, reply brain/ folder missing. Say "set up Founder OS" to build it. and stop.
  4. Follow the since-last-session skill instructions exactly.
    • If brain/.last-session is missing: print the seed message, write the marker, stop. No delta on the first run.
    • If brain/.last-session is present: read it, compute elapsed time, render the 5-section report, then overwrite the marker with the current ISO-8601 timestamp.
  5. Output the structured block defined in the skill. Nothing before, nothing after the fenced block, except the one-line Marker advanced to ... confirmation outside the fence.

When to use

  • Returning to the OS after a gap and you want the delta, not the full read.
  • Before any planning work, so the report scopes to what shifted while you were away.
  • After a parallel session ran on another machine and you want a quick "what is new on disk".

When NOT to use

  • Full state-of-the-OS orientation. Use /founder-os:strategic-read for the 5-section read across the brain.
  • A single-topic question. Use /founder-os:brain-pass "<question>" or /founder-os:query "<keyword>".

Examples

  • /founder-os:since-last-session
  • "what changed since last session"
  • "catch me up since I was last here"

Rules

  • The skill reads the file layer and writes only to brain/.last-session. No other file is modified.
  • No external dependencies. No paid API. Git is used only to list filenames; the skill runs without git if the install is not a repo.
  • No em dashes or en dashes. Hyphens only with spaces.
  • No banned words per rules/writing-style.md or its template fallback.
  • The five section headers are a contract. Keep them verbatim.
  • First run seeds the marker only. Subsequent runs report the delta.

Read the full file on GitHub · 45 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. 4d ago First seen · 45 lines · 0 tokens per session scan A 891b8a2fd91a

Subscribe to this mod's changes

since-last-session is a command published in the GitHub repository ARCASSystems/FounderOS (5 stars, last pushed 21d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 690 tokens. 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.

Memory and contextai-agentsclaude-codefounder-osllms-txtmarkdownoperating-system
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