Claude Prompt Optimizer vs Pqs MCP Server
A side-by-side look at the Claude Prompt Optimizer and Pqs MCP Server MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Claude Prompt Optimizer for conversational ai work as a local process; choose Pqs MCP Server for conversational ai as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Claude Prompt Optimizer when
- You need dedicated capabilities in the Conversational AI domain.
- You prefer a local stdio subprocess transport.
- You want tools like
optimize_prompt, refine_prompt, pre_flight.
Choose Pqs MCP Server when
- You need dedicated capabilities in the Conversational AI domain.
- You prefer a local stdio subprocess transport.
- You have the keys it needs:
PQS_BASE. - You want tools like
score_prompt, optimize_prompt.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Conversational AI | Conversational AI |
| Quality signal | 61/100 · Good | 56/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | Not declared | Not declared |
| Pricing | Not declared | Not declared |
| Required env vars | None listed | PQS_BASE |
| Verified owner | Community listing | Community listing |
| GitHub stars | 2 | 2 |
| Directory activity | 1 views 0 installs 0 upvotes | 2 views 0 installs 0 upvotes |
| Tools | 20 | 2 |
| Full listing | View Claude Prompt Optimizer | View Pqs MCP Server |
Tools & capabilities
Claude Prompt Optimizer tools 20
optimize_promptAnalyze a raw prompt, detect ambiguities, compile an optimized version, score quality, and estimate cost across providers. Returns a PreviewPack for review.refine_promptRefine a prompt by answering blocking questions or providing manual edits. Re-runs analysis and returns updated PreviewPack.pre_flightFull pre-flight analysis: classify task, assess risk, route model, score quality. Returns complete decision bundle. Metered — counts as 1 optimization use.check_promptQuick pass/fail check of a prompt. Returns score, top issues, and a suggestion. No compilation, no session.approve_promptApprove the compiled prompt. Returns the final optimized prompt ready for use.estimate_costEstimate token count and cost across providers for any prompt text. No session needed.compress_contextCompress context (code, docs) by removing irrelevant sections. Returns pruned context with token savings.classify_taskClassify a prompt by task type, reasoning complexity, risk level, and suggested profile. Free — no metering.route_modelRoute to the optimal model based on task complexity, risk, budget, and latency preferences. Returns recommendation with decision_path audit trail. Free — no metering.prompt_statsGet aggregated optimization statistics: total count, average score, top task types, estimated savings.prune_toolsScore and rank MCP tools by relevance to a task intent. Optionally prune low-relevance tools to save context tokens.configure_optimizerConfigure optimizer behavior: mode, threshold, strictness, default target, ephemeral mode, session limits. Supports config locking with passphrase protection.- +8 more on the listing page
Pqs MCP Server tools 2
score_promptScore a prompt's quality across 8 dimensions BEFORE sending it to an expensive model. Returns a 0-80 score, an A-F grade, the per-dimension breakdown (clarity, specificity, context, constraints, output_format, role_definition, examples, cot_structure), and the weakest dimension. USE WHEN: - The user is workshopping a prompt and asks "is this good?" / "will this work?" / "should I add more detail?" - The user is about to send a long or expensive prompt to GPT-4, Claude Opus, or any frontier model, especially in a batch or automation context where rework is costly. - The user mentions iterating on a prompt that produced poor output and wants to diagnose what's missing. - The user pastes a prompt and asks for feedback on it. DO NOT USE WHEN: - The user is asking you to write a prompt for them (write it yourself first, then optionally call score_prompt to verify). - The prompt is conversational chat (this scores task-shaped prompts). COST: Free, no API key required. Rate-limited per IP: 5/min, 10/day, 100/month. If the user exceeds the limit, the response will include a structured upgrade path with subscribe and account URLs. LATENCY: ~2 seconds.optimize_promptRewrite a prompt to score higher on the PQS rubric, AND show before/after output comparisons so the user can see the impact. Returns the optimized prompt, the original PQS score, the optimized PQS score, and side-by-side sample outputs from a frontier model using both versions. USE WHEN: - The user got a low score from score_prompt and asks how to improve. - The user explicitly asks to "improve" / "rewrite" / "fix" / "optimize" a prompt they pasted. - The user is dissatisfied with output quality from a previous prompt and asks how to get better results. - score_prompt returned a suggestion to invoke this tool. DO NOT USE WHEN: - The user just asked for a score (use score_prompt only — don't double up). - The user wants you to write a new prompt from scratch (write it directly). REQUIRES: A PQS API key from a Pro subscription ($19.99/month, 1,000 calls/mo, includes batch + A/B comparison). If the user has not provided one, the tool returns a clear subscription URL — pass that response to the user verbatim. Do not invent or guess API keys. There is no free trial of this tool; the user must subscribe before the first call. COST: Counted against your Pro subscription's monthly call quota. LATENCY: ~6-8 seconds.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Claude Prompt Optimizer
{
"mcpServers": {
"claude-prompt-optimizer": {
"command": "npx",
"args": [
"-y",
"pcp-engine"
]
}
}
}
Pqs MCP Server
{
"mcpServers": {
"pqs-mcp-server": {
"command": "npx",
"args": [
"-y",
"pqs-mcp-server"
],
"env": {
"PQS_BASE": "YOUR_PQS_BASE_HERE"
}
}
}
}
Frequently asked questions
Claude Prompt Optimizer is categorized under Conversational AI and uses a local stdio subprocess. Pqs MCP Server belongs to Conversational AI and uses a local stdio subprocess. Pick Claude Prompt Optimizer for conversational ai work and Pqs MCP Server for conversational ai.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Claude Prompt Optimizer has no declared pricing — check the project's own site. Pqs MCP Server has no declared pricing — check the project's own site. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add claude-prompt-optimizer and pqs-mcp-server as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Claude Prompt Optimizer has a quality signal of 61/100 (Good) with 1 views, 0 installs and 2 GitHub stars. Pqs MCP Server has 56/100 (Good) with 2 views, 0 installs and 2 GitHub stars.