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.
npx skills add HashLips/agent-skills --skill token-estimatorgit clone --depth 1 https://github.com/HashLips/agent-skillsWrote 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/hashlips/agent-skills/token-estimator)<a href="https://agentmods.dev/skills/hashlips/agent-skills/token-estimator"><img src="https://agentmods.dev/badge/skills/hashlips/agent-skills/token-estimator.svg" alt="Measured on agentmods" 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 | $0.00045 | $0.00442 |
| Opus 5 | $0.00023 | $0.00221 |
| Sonnet 5 | $0.00009 | $0.00088 |
| Haiku 4.5 | $0.00005 | $0.00044 |
Grade A, and why
token-estimator 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 7d 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.
What it actually says
Token Estimator
Disclaimer
Rough estimate only — not billing-grade. Same file on disk → same numbers every run. Real token counts depend on the model’s tokenizer; this skill uses a fixed heuristic (⌈chars ÷ 4⌉, English-oriented). Use for ballparks and comparisons, not hard limits.
What It Does
- One file — report
charsandest_tokens. - Folder — recursively count every
.md,.txt,.mdxfile; report per file plus total. - Read-only — never modify targets.
Workflow
- Confirm path (file or directory).
- Run scripts/estimate_tokens.py when possible; otherwise apply references/estimation-method.md.
- Reply with totals first, then per-file lines only if there is more than one file.
Rules
- Deterministic — fixed extensions, alphabetical order, integer formula
(chars + 3) // 4. - Recursive — walk subdirectories; skip
.git,node_modules,__pycache__,.venv, binaries. - Label — always say
est_tokensor~tokens, never imply exact provider counts.
Output (Minimal)
total: 5376 chars, ~1344 est_tokens
references/foo.md: 1112 chars, ~278 est_tokens
One path in the reply is enough unless the user asked for several.
Reference
- Formulas and file rules: references/estimation-method.md
When To Use
- Ballpark size of a doc, skill folder, or prompt file.
- Same metric applied twice should match (sanity check, before/after edits).
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 7d ago First seen · 47 lines · 45 tokens per session scan A 064c5b3e8f8e
token-estimator is a skill published in the GitHub repository HashLips/agent-skills (24 stars, last pushed 12d ago), licensed MIT. It adds 45 tokens to every session and 442 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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