What is mcp-stress-test?

A load-testing workflow for a Deephaven documentation server, which provides programming answers through an MCP interface.

It is for checking a development or production documentation server with repeated sequential calls to its documentation-chat function.

It reveals timeouts, rate limits, connection failures, and changing responses during repeated requests.

How deephaven/deephaven-mcp configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to deephaven/deephaven-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/deephaven/deephaven-mcp/main/.agents/skills/mcp-stress-test/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/deephaven/deephaven-mcp

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/deephaven/deephaven-mcp/mcp-stress-test/github.svg)](https://agentmods.dev/skills/deephaven/deephaven-mcp/mcp-stress-test)

Your own site

<a href="https://agentmods.dev/skills/deephaven/deephaven-mcp/mcp-stress-test"><img src="https://agentmods.dev/badge/skills/deephaven/deephaven-mcp/mcp-stress-test/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/deephaven/deephaven-mcp/mcp-stress-test"><img src="https://agentmods.dev/badge/skills/deephaven/deephaven-mcp/mcp-stress-test.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 59 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 680 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.

Model	Per session	Once invoked
Fable 5.1	$0.00059	$0.00680
Opus 5	$0.00030	$0.00340
Sonnet 5	$0.00012	$0.00136
Haiku 4.5	$0.00006	$0.00068

Measured 9d ago against content hash 4dd9f2ec402c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

mcp-stress-test 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 9d 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/skills/mcp-stress-test/SKILL.md · 62 lines

How it starts

The opening of the file, as written. The whole thing — 62 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MCP Stress Test Workflow

This workflow stress tests a deephaven-docs MCP server by making N sequential calls to its docs_chat tool.

Steps

Ask which server to target
- Ask the user: dev (deephaven-docs-dev-remote) or prod (deephaven-docs-prod-remote)?
- Do not proceed until the user has confirmed the target server.
Confirm prompt and call count
- Default prompt: "Write a query to join quotes onto trades."
- Default call count: 100
- If the user supplied either as a parameter, use their value; otherwise confirm the defaults.
Verify MCP Server Connection
- Ensure the target server is connected and responding
- Test with a single docs_chat call from the target server first
Execute Stress Test
- Call the docs_chat tool from the target server with the confirmed prompt
- Repeat the call N times sequentially (one at a time, not in parallel)
- Display the JSON result from each call
- Number each call (e.g., Call 1/N:, Call 2/N:)
- Provide pass/fail status updates as the tests are run
Monitor for Issues
- Watch for connection failures, timeouts, or rate limiting
- Note any variations in response content or format
- Track response times
Report Results
- Summarize the total number of successful vs failed calls
- Note any patterns in response variations
- Report any server errors or connectivity issues

Expected Behavior

Each docs_chat call should return a non-error JSON object with a content field.
When using the default prompt ("Write a query to join quotes onto trades."), the content should contain Deephaven query examples covering as-of joins / the aj method.
When using a custom prompt, success means a non-error JSON response with a content field — the actual content depends on the prompt, and content variation across calls is normal.
All calls should complete successfully unless there are server issues.

Server Identification

Read the full file on GitHub · 62 lines

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.

9d ago First seen · 62 lines · 59 tokens per session scan A 4dd9f2ec402c

Subscribe to this mod's changes

mcp-stress-test is a skill published in the GitHub repository deephaven/deephaven-mcp (5 stars, last pushed yesterday), licensed Apache-2.0. It adds 59 tokens to every session and 680 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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deephaven-mcp: Skill for Claude Code