stale

A test agent with an outdated sidecar file, which stores information about another file. Its saved hash no longer matches the current agent body.

In plain words
What is it for?
Testing stale-metadata detection and the annotation-stale event after an agent body changes.
Why use it?
It helps test whether the system notices that stored metadata is stale instead of trusting it.

Agent 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 agents/crystian/skill-map/stale
Clone the repo
git clone --depth 1 https://github.com/crystian/skill-map

Made for: Claude Code.

Per session 33 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 76 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 $0.00033 $0.00076
Opus 5 $0.00016 $0.00038
Sonnet 5 $0.00007 $0.00015
Haiku 4.5 $0.00003 $0.00008

Measured yesterday against content hash e35f860dc23e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

stale 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 yesterday.

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.

spec/conformance/fixtures/sidecar-end-to-end/.claude/agents/stale.md · 9 lines

What it actually says

Stale agent

This body has been edited since the sidecar was last bumped. The sidecar's for.bodyHash will not match the live sha256 of this content.

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. yesterday First seen · 9 lines · 33 tokens per session scan A e35f860dc23e

Subscribe to this mod's changes

stale is an agent published in the GitHub repository crystian/skill-map (59 stars, last pushed 2d ago), licensed MIT. It adds 33 tokens to every session and 76 once invoked, about $0.0002 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.

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