diff

A command that shows changes made to a MindLink project’s .brain folder since the current session began. The folder contains the AI assistant’s saved memory, session notes, shared context, and history.

In plain words
What is it for?
Use it before ending a session to review captured context, or when debugging changes to memory files. It reports modified files, line counts, timestamps, and Git differences when available.
Why use it?
It helps you check whether the assistant actually saved context and investigate missing follow-up information. When Git tracks the folder, it can also show added and removed lines.

Command

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/404-not-found/mindlink/diff
Clone the repo
git clone --depth 1 https://github.com/404-not-found/mindlink
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 798 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 $0.00798
Opus 5 $0.00000 $0.00399
Sonnet 5 $0.00000 $0.00160
Haiku 4.5 $0.00000 $0.00080

Measured 2d ago against content hash b4961ac54afc, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

diff 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 2d 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.

commands/diff.md · 116 lines

How it starts

The opening of the file, as written. The whole thing — 116 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Show what changed in .brain/ since the current session started.


Synopsis

mindlink diff [--since <ref>] [--json]

Description

Shows a per-file summary of .brain/ changes since the session began — which files were modified, how many lines they contain, and when they were last touched.

If .brain/ is committed to git, mindlink diff also shows line-level additions and removals so you can see exactly what the AI wrote.

This command is useful for:

  • Verifying that your AI actually wrote to MEMORY.md during the session (not just claimed to)
  • Reviewing what context was captured before closing a session
  • Debugging why a follow-up session is missing context

Your AI can run this. Ask it to run mindlink diff to check its own work.


Output

Without git tracking:

  .brain/ changes
  Session started 12m ago
  .brain/ is not git-tracked — showing modification times only

  ●  MEMORY.md   94 lines · modified 3m ago
  ○  SESSION.md  32 lines · modified 12m ago
  ○  LOG.md      24 lines · modified 12m ago
  ○  SHARED.md   21 lines · modified 12m ago

  ✓  1 file updated this session.

= modified this session · = not modified this session

With git tracking (.brain/ committed):

  .brain/ changes
  Session started 12m ago
  Git diff against: HEAD~1

  ●  MEMORY.md   97 lines · modified 3m ago
       + TypeScript + Node.js <!-- added: 2026-04-12 -->
       + Use mtime-based session verification for Stop hook

  ○  SESSION.md  32 lines · modified 12m ago
       no changes since last commit

Options

Flag Description
--since <ref> Git ref or date to diff against. Default: HEAD~1. Examples: HEAD~3, "2026-04-10"
--json Output as JSON — useful for scripting or AI consumption

Examples

Check what changed this session:

mindlink diff

Diff against 3 commits ago:

mindlink diff --since HEAD~3

Machine-readable output:

mindlink diff --json

Read the full file on GitHub · 116 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. 2d ago First seen · 116 lines · 0 tokens per session scan A b4961ac54afc

Subscribe to this mod's changes

diff is a command published in the GitHub repository 404-not-found/mindlink (11 stars, last pushed 4mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 798 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 2026-08-30.