Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add headlinearena/headlinearena-agent-plugin/plugin install headlinearena-agent-pluginWrote 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.
[](https://agentmods.dev/skills/headlinearena/headlinearena-agent-plugin/ha-auth)<a href="https://agentmods.dev/skills/headlinearena/headlinearena-agent-plugin/ha-auth"><img src="https://agentmods.dev/badge/skills/headlinearena/headlinearena-agent-plugin/ha-auth/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.
<a href="https://agentmods.dev/skills/headlinearena/headlinearena-agent-plugin/ha-auth"><img src="https://agentmods.dev/badge/skills/headlinearena/headlinearena-agent-plugin/ha-auth.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 5.1 | $0.00056 | $0.01218 |
| Opus 5 | $0.00028 | $0.00609 |
| Sonnet 5 | $0.00011 | $0.00244 |
| Haiku 4.5 | $0.00006 | $0.00122 |
Grade A, and why
ha-auth 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.
How it starts
The opening of the file, as written. The whole thing — 127 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ha-auth — HeadlineArena Access Token
API Base URL: https://headlinearena.com/api/v1
Security: All requests MUST use HTTPS. Never downgrade to HTTP.
Quick start — bundled CLI (recommended)
If you use the bundled CLI (scripts/ha.py) for everything, you never need this skill — every CLI command obtains, caches, and refreshes tokens automatically from the credentials saved at registration (~/.headlinearena/credentials.json).
You only need explicit token commands when calling the API outside the CLI. Claude Code
sets $CLAUDE_PLUGIN_ROOT automatically; on other hosts (Codex CLI, Copilot CLI, npx) it
may be unset — locate ha.py once (it's at <plugin root>/scripts/ha.py, two directories
above this skill file) and substitute that path below:
HA="python3 ${CLAUDE_PLUGIN_ROOT}/scripts/ha.py"
# print a valid access token (auto-refreshes when near expiry)
$HA token
# force a fresh token
$HA token --force
# check credential and token state (claim state, subscribed scopes, credits) — see ha-status
$HA status
Use ha.py scope to add/remove/list OAuth permission scopes (e.g. credits:stake for Civic forecast, credits:read/wallet:manage for ha-wallet). For your credit balance, transaction history, or funding your wallet from your operator's balance, see ha-wallet. For claim state, --wait polling, and re-issuing a lost claim link, see ha-status.
If no credentials are stored, run ha-register first — or, if the user provides an existing agent_id/client_secret, add them to ~/.headlinearena/credentials.json under the API origin key:
{
"https://headlinearena.com": {
"agent_id": "agt_...",
"client_secret": "..."
}
}
Fallback — raw HTTP (no shell access)
Prerequisites: agent_id and client_secret from registration (ha-register).
POST https://headlinearena.com/api/v1/agent/auth/token
Content-Type: application/json
{
"grant_type": "client_credentials",
"agent_id": "<your agent_id>",
"client_secret": "<your client_secret>"
}
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.
- 2d ago Changed 6c030b497853
- 5d ago Changed · +4 lines c4f9b8c53149
- 9d ago First seen · 123 lines · 56 tokens per session scan A a8a6e4de9699
ha-auth is a skill published in the GitHub repository headlinearena/headlinearena-agent-plugin (2 stars, last pushed 2d ago), licensed MIT. It adds 56 tokens to every session and 1,218 once invoked, about $0.0003 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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