horizon-worker

horizon-worker is an agent for Claude Code from Master0fFate/parallax-claudecode. It costs 27 tokens per session (282 once invoked), scanned A, original, MIT.

A worker agent for the Horizon project that implements one specifically assigned feature and returns a short evidence report.

In plain words
What is it for?
Use it when a Horizon supervisor dispatches an atomic feature. Its handoff records changed files, acceptance status, checks, verification receipt, and remaining risk.
Why use it?
It limits each worker to one feature, reducing scope expansion and leaving project coordination to a supervisor. It also requires focused tests and a verification result before the work counts as passing.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter; names the NotebookEdit tool.

Part of the parallax-claudecode plugin — 9 skills, 1 command, 4 agents, 12 hooks, 1 MCP server shipped together

Good fit Use it when a Horizon supervisor dispatches an atomic feature. Its handoff records changed files, acceptance status, checks, verification receipt, and remaining risk.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/master0ffate/parallax-claudecode/horizon-worker
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.

Clone the repo
git clone --depth 1 https://github.com/Master0fFate/parallax-claudecode

Made for: Claude Code.

Or install parallax-claudecode, the plugin that ships this one along with the rest of its 9 skills, 1 command, 4 agents, 12 hooks, 1 MCP server.

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 horizon-worker

README.md
[![agentmods](https://agentmods.dev/badge/agents/master0ffate/parallax-claudecode/horizon-worker/github.svg)](https://agentmods.dev/agents/master0ffate/parallax-claudecode/horizon-worker)
Your own site
<a href="https://agentmods.dev/agents/master0ffate/parallax-claudecode/horizon-worker"><img src="https://agentmods.dev/badge/agents/master0ffate/parallax-claudecode/horizon-worker/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for horizon-worker

Your own site · 80×15
<a href="https://agentmods.dev/agents/master0ffate/parallax-claudecode/horizon-worker"><img src="https://agentmods.dev/badge/agents/master0ffate/parallax-claudecode/horizon-worker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 27 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 282 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00027 $0.00282
Opus 5.5 $0.00011 $0.00113
Sonnet 5.5 $0.00005 $0.00056
Haiku 4.5 $0.00003 $0.00028

Measured 1mo ago against content hash ed698ed0778f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

horizon-worker 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 1mo 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.

agents/horizon-worker.md · 18 lines

What it actually says

Horizon Worker

Implement exactly the atomic feature in the dispatch prompt. Do not delegate, orchestrate, audit your own result, change Horizon state, or expand scope.

Read repository instructions and nearby tests first. Before mutation, complete the required Parallax ambiguity, invariants, and gate check-ins. Preserve unrelated behavior and add focused tests. Run parallax_verify after the changed-file batch and retain its schema-v2 receipt ID and exact verdict. Only pass is passing evidence.

Return one Markdown handoff of at most 2,000 characters containing only changed files, acceptance-criteria status, observed checks and verdicts, receipt ID/verdict, and residual risk. Child prose never releases the Horizon lock and is not an audit.

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. 1mo ago First seen · 18 lines · 27 tokens per session scan A ed698ed0778f

Subscribe to this mod's changes

horizon-worker is an agent published in the GitHub repository Master0fFate/parallax-claudecode (0 stars, last pushed 7d ago), licensed MIT. It adds 27 tokens to every session and 282 once invoked, about $0.0001 per session on Opus 5.5. 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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