um-preview

um-preview is a command for coding agents from goldenwo/universal-memory. It costs 14 tokens per session (206 once invoked), scanned A, original, MIT.

A preview command for seeing what a project's memory state file would contain if it were updated now.

In plain words
What is it for?
It is for reviewing a pending memory merge before committing it with the checkpoint command.
Why use it?
It lets you check the proposed state without changing files, recording telemetry, or rebuilding indexes.

Command

Installs and runs on its own, but its text points at files inside its plugin — anything it tells you to read at a ${CLAUDE_PLUGIN_ROOT} path is only there once the plugin is installed. Installing the plugin gets both.

Part of the universal-memory plugin — 3 commands, 4 hooks shipped together

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/goldenwo/universal-memory/um-preview
Clone the repo
git clone --depth 1 https://github.com/goldenwo/universal-memory

Or install universal-memory, the plugin that ships this one along with the rest of its 3 commands, 4 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 um-preview

README.md
[![agentmods](https://agentmods.dev/badge/commands/goldenwo/universal-memory/um-preview.svg)](https://agentmods.dev/commands/goldenwo/universal-memory/um-preview)
Your own site
<a href="https://agentmods.dev/commands/goldenwo/universal-memory/um-preview"><img src="https://agentmods.dev/badge/commands/goldenwo/universal-memory/um-preview.svg" alt="Measured on agentmods" height="20"></a>
Per session 14 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 206 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 $0.00014 $0.00206
Opus 5 $0.00007 $0.00103
Sonnet 5 $0.00003 $0.00041
Haiku 4.5 $0.00001 $0.00021

Measured 4d ago against content hash e1f2d7ac73b1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

um-preview 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.

plugins/claude-code/universal-memory/commands/um-preview.md · 16 lines

What it actually says

Execute bash "${CLAUDE_PLUGIN_ROOT}/bin/um-preview" via the Bash tool and show the output verbatim.

This is a PREVIEW — a draft of what state.md would contain if session-end.sh ran right now. It does NOT modify any files in the vault:

  • No write to $UM_VAULT_DIR/state/<project>/state.md
  • No lockdir acquisition
  • No cost-log.csv telemetry append (update-state.sh --stdout suppresses it)
  • No reindex

Use this to sanity-check the merge before committing. If the preview looks good and you want to commit it, run /um-checkpoint instead — that invokes the canonical session-end pipeline that writes to disk and reindexes.

The underlying CLI is fail-soft: missing API key, empty captures, or LLM errors all exit non-zero with a human-readable message on stderr; they never corrupt data.

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 · 16 lines · 14 tokens per session scan A e1f2d7ac73b1

Subscribe to this mod's changes

um-preview is a command published in the GitHub repository goldenwo/universal-memory (2 stars, last pushed 6d ago), licensed MIT. It adds 14 tokens to every session and 206 once invoked, about $0.0001 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 2026-08-31.

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