register

A command that gives the current coding-agent session a name so other agents can contact it.

In plain words
What is it for?
Registering an agent before inter-agent messaging.
Why use it?
It lets multiple agent sessions identify and communicate with one another without manually finding session details.

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/pchalasani/claude-code-tools/register
Clone the repo
git clone --depth 1 https://github.com/pchalasani/claude-code-tools
Per session 11 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 118 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 $0.00011 $0.00118
Opus 5 $0.00005 $0.00059
Sonnet 5 $0.00002 $0.00024
Haiku 4.5 $0.00001 $0.00012

Measured 2d ago against content hash f5c0e7a35c78, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

register 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.

plugins/msg/commands/register.md · 19 lines

What it actually says

Run ONLY this ONE command. Do NOT run anything before or after it. No tmux commands, no queries, no status checks. The command auto-detects everything it needs.

msg register $ARGUMENTS

Show the output to the user. You are done.

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 · 19 lines · 11 tokens per session scan A f5c0e7a35c78

Subscribe to this mod's changes

register is a command published in the GitHub repository pchalasani/claude-code-tools (1,989 stars, last pushed 2d ago), licensed MIT. It adds 11 tokens to every session and 118 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 2026-08-30.