A setup command for Bifrost, which connects the Heimdall status display to a Claude Code session.

Use it to install, update, or clean up the Heimdall status-line configuration for Claude Code.

It checks whether Heimdall is installed and whether the session is using the latest version, warning before replacing another status display.

bifrost — Command for coding agents by GzuPark: A setup command for Bifrost, which connects the Heimdall…

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/gzupark/claude-plugin-pack/bifrost

Clone the repo

git clone --depth 1 https://github.com/GzuPark/claude-plugin-pack

Or install heimdall, the plugin that ships this one along with the rest of its 1 command.

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.

README.md

[![agentmods](https://agentmods.dev/badge/commands/gzupark/claude-plugin-pack/bifrost.svg)](https://agentmods.dev/commands/gzupark/claude-plugin-pack/bifrost)

Your own site

<a href="https://agentmods.dev/commands/gzupark/claude-plugin-pack/bifrost"><img src="https://agentmods.dev/badge/commands/gzupark/claude-plugin-pack/bifrost.svg" alt="Measured on agentmods" height="20"></a>

Per session 17 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 851 The whole file, excluding the scripts and references it only reads on demand.

Security scan D 2 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.

Model	Per session	Once invoked
Fable 5	$0.00017	$0.00851
Opus 5	$0.00009	$0.00426
Sonnet 5	$0.00003	$0.00170
Haiku 4.5	$0.00002	$0.00085

Measured 4d ago against content hash b539bc8bfc1d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade D, and why

bifrost scanned grade D with 2 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

Read `~/.claude/settings.json` and extract current `statusLine.command` path.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

Bash(npm install:*), Bash(npm run build:*), Bash(rm -rf:*),

plugins/heimdall/commands/bifrost.md · 158 lines

How it starts

The opening of the file, as written. The whole thing — 158 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Bifrost

Open the Bifrost bridge and summon Heimdall to watch over your Claude Code session.

Step 1: Find Plugin Versions

ls -d ~/.claude/plugins/cache/claude-plugin-pack/heimdall/*/ 2>/dev/null

If no directories found:

Inform user: "Heimdall not installed. Run /plugin install heimdall@claude-plugin-pack first."
END

If directories found:

Identify the latest version (highest semver)
Continue to Step 2

Step 2: Check Current Settings

Read ~/.claude/settings.json and extract current statusLine.command path.

Case A: No statusLine configured

Set CURRENT_VERSION = none
Continue to Step 3

Case B: statusLine configured with heimdall path

Extract version from path (e.g., /heimdall/1.0.1/statusline/ -> 1.0.1)
Set CURRENT_VERSION = extracted version
Continue to Step 3

Case C: statusLine configured with non-heimdall command

Warn user: "Existing statusLine will be replaced"
Set CURRENT_VERSION = none
Continue to Step 3

Step 3: Compare Versions

If CURRENT_VERSION == LATEST_VERSION:

Inform user: "Already up to date (v{VERSION})"
Continue to Step 6 (cleanup only)

If CURRENT_VERSION != LATEST_VERSION:

Continue to Step 4

Step 4: Build Latest Version

HEIMDALL=~/.claude/plugins/cache/claude-plugin-pack/heimdall
cd $HEIMDALL/<LATEST_VERSION>/statusline
npm install
npm run build

If build fails:

Show error message
END

If build succeeds:

Verify dist/index.js exists
Continue to Step 5

Step 5: Update Settings

Update ~/.claude/settings.json:

{
  "statusLine": {
    "type": "command",
    "command": "node <HEIMDALL_PATH>/statusline/dist/index.js",
    "padding": 0
  }
}

Where <HEIMDALL_PATH> is: <HOME>/.claude/plugins/cache/claude-plugin-pack/heimdall/<LATEST_VERSION>

Use Edit tool to preserve existing settings.

If settings.json doesn't exist:

Create new file with statusLine config only

Continue to Step 6

Read the full file on GitHub · 158 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.

4d ago First seen · 158 lines · 17 tokens per session scan D b539bc8bfc1d

Subscribe to this mod's changes

bifrost is a command published in the GitHub repository GzuPark/claude-plugin-pack (6 stars, last pushed 7mo ago), licensed MIT. It adds 17 tokens to every session and 851 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it D with 2 findings (reads agent configuration directories, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

bifrost