prime

A command for loading context at the start of an agent session by inspecting a project's files and documentation. It reports the project's structure, purpose, and key instructions.

In plain words
What is it for?
It is for listing tracked files, reading the specified README and documentation, and summarising the project's purpose and working instructions.
Why use it?
It helps a new agent understand the repository before making decisions or edits. This reduces the chance of missing important project-specific guidance.

Command for Claude Code

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/ianphil/promptbin/prime
Clone the repo
git clone --depth 1 https://github.com/ianphil/promptbin

Made for: Claude Code.

Per session 16 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 143 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 $0.00016 $0.00143
Opus 5 $0.00008 $0.00072
Sonnet 5 $0.00003 $0.00029
Haiku 4.5 $0.00002 $0.00014

Measured 2d ago against content hash 2493dcf2f4b2, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

prime 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.

.claude/commands/prime.md · 22 lines

What it actually says

Prime

Run the commands under the Execute section to gather information about the project, and then review the files listed under Read to understand the project's purpose and functionality then Report your findings.

Execute

  • git ls-files

Read

  • README.md
  • ai_docs/cc_hooks_docs.md
  • ai_docs/uv-single-file-scripts.md
  • ai_docs/anthropic_custom_slash_commands.md
  • ai_docs/anthropic_docs_subagents.md

Report

  • Provide a summary of your understanding of the project
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 · 22 lines · 16 tokens per session scan A 2493dcf2f4b2

Subscribe to this mod's changes

prime is a command published in the GitHub repository ianphil/promptbin (0 stars, last pushed 7mo ago), licensed MIT. It adds 16 tokens to every session and 143 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.