Anth Load Scale

What it does

When your agent uses it

• Running performance benchmarks
• Planning for traffic spikes
• Configuring horizontal scaling for Claude-powered services
• With phrases like anthropic load test

Example prompts

• “anthropic load test”
• “claude scaling”
• “anthropic capacity planning”
• “/anth-load-scale”

Requirements

• Python 3
• Compatibility (from SKILL.md): Designed for Claude Code
• Pre-approved tools (allowed-tools): Read, Write, Edit, Bash(npm:*), Grep

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Calculate RPM, input tokens per minute, output tokens per minute, concurrency, and expected cost from the measured workload. Reserve…
2. 2Start with a small canary, then increase concurrency in bounded steps while a shared limiter coordinates all workers. Stop immediately at…
3. 3Separate real-time traffic from batch work, and use queue backpressure rather than unbounded task creation. Honor provider retry metadata…
4. 4Compare baseline and candidate metrics, including aggregate token/cost usage and side_effects=0. Promote only after an owner approves the…
5. 5Expire synthetic fixtures, queues, and temporary metrics according to the test retention policy, and keep a redacted capacity receipt.

What it can do on your machine

Read from SKILL.md and the folder at commit 80f86df. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Read
  • Write
  • Edit
  • Bash(npm:*)
  • Grep

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are python).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • platform.claude.com

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  Designed for Claude Code

  From compatibility in the SKILL.md frontmatter.

Context cost

Anth Load Scale loads about 1.8k tokens when it runs. Until then it costs about 86 tokens; SKILL.md has 396 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~86

When it runs · the whole SKILL.md, loaded when a task matches

~1.8k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from jeremylongshore/tons-of-skills-marketplace at commit 80f86df, republished under its MIT licence (© jeremylongshore). 396 words, ~1,806 tokens.

name

anth-load-scale

description

Implement load testing, auto-scaling, and capacity planning for Claude API. Use when running performance benchmarks, planning for traffic spikes, or configuring horizontal scaling for Claude-powered services. Trigger with phrases like "anthropic load test", "claude scaling", "anthropic capacity planning", "scale claude api".

allowed-tools

Read, Write, Edit, Bash(npm:*), Grep

compatibility

Designed for Claude Code

version

1.7.0

license

MIT

author

Jeremy Longshore <jeremy@intentsolutions.io>

tags

saas, ai, anthropic

# Calculate required tier based on traffic
def plan_capacity(
    requests_per_minute: int,
    avg_input_tokens: int,
    avg_output_tokens: int,
    model: str = "claude-sonnet-4-20250514"
) -> dict:
    itpm = requests_per_minute * avg_input_tokens
    otpm = requests_per_minute * avg_output_tokens

    # Estimate monthly cost
    pricing = {
        "claude-haiku-4-20250514": (0.80, 4.00),
        "claude-sonnet-4-20250514": (3.00, 15.00),
        "claude-opus-4-20250514": (15.00, 75.00),
    }
    rates = pricing[model]
    cost_per_request = (avg_input_tokens * rates[0] + avg_output_tokens * rates[1]) / 1_000_000
    monthly_cost = cost_per_request * requests_per_minute * 60 * 24 * 30

    return {
        "rpm_needed": requests_per_minute,
        "itpm_needed": itpm,
        "otpm_needed": otpm,
        "cost_per_request": f"${cost_per_request:.4f}",
        "monthly_estimate": f"${monthly_cost:,.0f}",
        "recommendation": "Contact Anthropic sales for Scale tier" if requests_per_minute > 500 else "Self-serve tiers sufficient",
    }

print(plan_capacity(100, 500, 200))

import anthropic
import asyncio
import time
from dataclasses import dataclass

@dataclass
class LoadTestResult:
    total_requests: int = 0
    successful: int = 0
    failed: int = 0
    rate_limited: int = 0
    avg_latency_ms: float = 0
    p99_latency_ms: float = 0
    total_input_tokens: int = 0
    total_output_tokens: int = 0

async def load_test(
    concurrency: int = 10,
    total_requests: int = 100,
    model: str = "claude-haiku-4-20250514"
) -> LoadTestResult:
    client = anthropic.Anthropic()
    result = LoadTestResult()
    latencies = []
    semaphore = asyncio.Semaphore(concurrency)

    async def single_request():
        async with semaphore:
            start = time.monotonic()
            try:
                msg = client.messages.create(
                    model=model,
                    max_tokens=64,
                    messages=[{"role": "user", "content": "Respond with exactly: OK"}]
                )
                duration = (time.monotonic() - start) * 1000
                latencies.append(duration)
                result.successful += 1
                result.total_input_tokens += msg.usage.input_tokens
                result.total_output_tokens += msg.usage.output_tokens
            except anthropic.RateLimitError:
                result.rate_limited += 1
            except Exception:
                result.failed += 1
            result.total_requests += 1

    tasks = [single_request() for _ in range(total_requests)]
    await asyncio.gather(*tasks)

    if latencies:
        latencies.sort()
        result.avg_latency_ms = sum(latencies) / len(latencies)
        result.p99_latency_ms = latencies[int(len(latencies) * 0.99)]

    return result

# Run: asyncio.run(load_test(concurrency=10, total_requests=50))

# Multiple application instances sharing the same API key
# Rate limits are per-organization, NOT per-instance
# Use a shared rate limiter (Redis) to coordinate

import redis

r = redis.Redis()

def check_rate_limit(key: str = "claude:rpm", limit: int = 100, window: int = 60) -> bool:
    current = r.incr(key)
    if current == 1:
        r.expire(key, window)
    return current <= limit

© jeremylongshore, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/.curated/anth-load-scale of jeremylongshore/tons-of-skills-marketplace.

Open the folder on GitHubat commit 80f86df