🚀 Consult LLM MCP
An MCP server that enables Claude Code to consult more powerful AI models (o3, Gemini 2.5 Pro, DeepSeek Reasoner) when in - depth analysis of complex problems is required.
This SQL query is timing out on large datasets. Can you help optimize it? Ask Gemini
⏺ I'll examine your query and consult Gemini for database optimization strategies.
⏺ consult-llm:consult_llm (MCP)(prompt: "How can I optimize this slow SQL query for better performance on large datasets?", files: ["queries/user - analytics.sql","schema/tables.sql"], model: "gemini-2.5-pro")
⎿ The query has significant performance bottlenecks: missing indexes on join columns, inefficient subqueries that could be CTEs, and unnecessary DISTINCT operations. Add composite indexes on (user_id, created_at), replace correlated subqueries with window functions, and eliminate redundant GROUP BY clauses.
… +287 lines (ctrl+r to expand)
⏺ Great insights! I'll add the suggested indexes, refactor the subqueries to use CTEs with window functions, and optimize the GROUP BY operations.
✨ Features
- Query powerful AI models (o3, Gemini 2.5 Pro, DeepSeek Reasoner) with relevant files as context.
- Direct queries with optional file context.
- Include git changes for code review and analysis.
- Comprehensive logging with cost estimation.
📦 Installation
Add the MCP server to Claude Code:
claude mcp add consult-llm -- npx -y consult-llm-mcp
Or for global availability:
claude mcp add --scope user consult-llm -- npx -y consult-llm-mcp
Optionally you can provide environment variables directly in the MCP configuration:
claude mcp add \
-e OPENAI_API_KEY=your_openai_key \
-e GEMINI_API_KEY=your_gemini_key \
-e DEEPSEEK_API_KEY=your_deepseek_key \
consult-llm -- npx -y consult-llm-mcp
💻 Usage Examples
Basic Usage
When using with Claude Code, here are some real - world examples:
Explain the problem, and tell CC to consult a smarter LLM
<Some long explanation of the issue here>
Consult LLM for assistance, use gemini
⏺ I see the issue! The problem is that the frontend is trying to use the hint for "isn't" but the server generated a hint for "isn't it" (the full phrase). This is a mismatch between how the frontend segments text and how the server generates hints.
Let me consult the LLM to get assistance on this segmentation mismatch issue.
⏺ Write(hint-segmentation-issue.md)
⎿ Wrote 53 lines to hint-segmentation-issue.md
# Hint Segmentation Mismatch Issue
## Problem Description
There's a mismatch between how the frontend segments text for clickable words and how the backend generates hints. This causes hint unlocking to fail when the segments don't match exactly.
## Example Case
**Original Text**: "Hello! Nice weather, isn't it?"
… +43 lines (ctrl+r to expand)
⏺ consult-llm:consult_llm (MCP)(model: "gemini-2.5-pro", files: ["/project/hint -segmentation-issue.md","/project/web/src/components/HintsText.tsx","/project/web/src/utils/hints.ts","/project/server/src/routes/public/hints.ts","/project/server/src/llm/hints.ts"])
⎿ An excellent analysis of the problem. The root cause has been correctly identified: a race condition within the `handleConfirmGenerateHints` function in `HintsText.tsx`. The component state updates in the background after `await generateHints()`, but the function continues executing with a stale `activeSegment` variable, causing it to request a hint for a smaller text segment ( e.g., "isn't") instead of the full, newly - available hint phrase (e.g., "isn't it").
… +607 lines (ctrl+r to expand)
⏺ Perfect! The LLM identified the core issue - there's a race condition in handleConfirmGenerateHints where the function uses stale state after async operations. The solution is to re - target the hint key after generation to find the correct matching hint.
Let me implement this solution:
⏺ Update Todos
⎿ ☐ Fix hint segmentation mismatch by implementing smarter hint key targeting in handleConfirmGenerateHints
Debugging Neovim plugin treesitter API breakage
⏺ Fixed! Added nil checks for both node and child and updated the iter_matches call to handle the newer API properly.
> Still not working:
E5108: Error executing lua /Users/raine/code/testonly.nvim/lua/testonly.lua:92: attempt to call method 'child' (a nil value)
stack traceback:
/Users/raine/code/testonly.nvim/lua/testonly.lua:92: in function 'reset_all_exclusive'
/Users/raine/code/testonly.nvim/lua/testonly.lua:110: in function 'reset_all_exclusive'
[string ":lua"]:1: in main chunk
Ask gemini
⏺ Let me consult with a more powerful AI to understand the current Neovim treesitter API changes:
⏺ consult-llm:consult_llm (MCP)(prompt: "I'm debugging a Neovim plugin that's broken due to treesitter API changes. The error is \"attempt to call method 'child' (a nil value)\" on line 92. The code is trying to access child nodes from treesitter matches but the API seems to have changed in newer Neovim versions.\n\nHere's the problematic code:\n```lua\nfor _, match, _ in parsed_query:iter_matches(root, bufnr, start_row, end_row) do\n for id, node in pairs(match) do\n local name = parsed_query.captures[id]\n if name == \"call\" and node then\n local child = node:child(0) -- ERROR HERE\n if child then\n local text = vim.treesitter.get_node_text(child, bufnr)\n -- ... rest of logic\n end\n end\n end\nend\n```\n\nWhat's the correct way to iterate over treesitter query matches and access child nodes in current Neovim versions? What API changes should I be aware of?", files: ["/Users/raine/code/testonly.nvim/lua/testonly.lua"])
⎿ Problem
-------
… +93 lines (ctrl+r to expand)
⏺ Perfect! The issue is that iter_matches() can return nil nodes in the match table. Let me fix this by switching to the recommended iter_captures() approach:
⏺ Update(lua/testonly.lua)
⎿ Updated lua/testonly.lua with 7 additions and 10 removals
85 local root = parser:parse()[1]:root()
86 local start_row, _, end_row, _ = root:range()
87
88 - for _, match, _ in parsed_query:iter_matches(root, bufnr, start_row, end_row) do
89 - for id, node in pairs(match) do
90 - local name = parsed_query.captures[id]
91 - if name == "call" and node then
92 - local child = node:child(0)
93 - if child then
94 - local text = vim.treesitter.get_node_text(child, bufnr)
88 + for id, node, _ in parsed_query:iter_captures(root, bufnr, start_row, end_row) do
89 + if parsed_query.captures[id] == "call" then
90 + local first_child = node:named_child(0)
91 + if first_child then
92 + local text = vim.treesitter.get_node_text(first_child, bufnr)
93
94 - if text == "it.only" or text == "describe.only" then
95 - toggle_test_exclusive(child)
96 - end
94 + if text == "it.only" or text == "describe.only" then
95 + toggle_test_exclusive(first_child)
96 end
97 end
98 end
⏺ Fixed! The key changes:
1. Switched from iter_matches() to iter_captures() which never returns nil nodes.
2. Used named_child(0) instead of child(0) to get only meaningful syntax nodes (not punctuation).
3. Simplified the iteration logic since iter_captures() directly gives us the node and capture ID.
Your <leader>tr mapping should now work properly with the current Neovim treesitter API.
📚 Documentation
MCP Tool: consult_llm
The server provides a single tool called consult_llm for asking powerful AI models complex questions.
Parameters
- prompt (required): Your question or request for the consultant LLM.
- files (optional): Array of file paths to include as context.
- All files are added as context with file paths and code blocks.
- model (optional): LLM model to use.
- Options:
o3 (default), gemini-2.5-pro, deepseek-reasoner.
- git_diff (optional): Include git diff output as context.
- files (required): Specific files to include in diff.
- repo_path (optional): Path to git repository (defaults to current directory).
- base_ref (optional): Git reference to compare against (defaults to HEAD).
Example Usage
Basic prompt:
{
"prompt": "What are the performance implications of using async/await vs Promise.then() in Node.js?"
}
With file context:
{
"prompt": "How can I optimize this authentication middleware?",
"files": ["src/auth.ts", "src/middleware.ts"],
"model": "o3"
}
With git diff:
{
"prompt": "Review these authentication changes for security issues",
"files": ["src/auth.ts"],
"git_diff": {
"files": ["src/auth.ts", "src/middleware.ts"],
"base_ref": "main"
},
"model": "gemini-2.5-pro"
}
Supported Models
| Property |
Details |
| Model Type |
o3 (OpenAI's reasoning model, $2/$8 per million tokens), gemini - 2.5 - pro (Google's Gemini 2.5 Pro, $1.25/$10 per million tokens), deepseek - reasoner (DeepSeek's reasoning model, $0.55/$2.19 per million tokens) |
| Training Data |
Not provided |
Logging
All prompts and responses are logged to ~/.consult-llm-mcp/logs/mcp.log with:
- Tool call parameters.
- Full prompts and responses.
- Token usage and cost estimates.
Example
[2025-06-22T20:16:04.673Z] TOOL CALL: consult_llm
Arguments: {
"files": [
"refactor-analysis.md",
"src/main.ts",
"src/schema.ts",
"src/config.ts",
"src/llm.ts",
"src/llm-cost.ts"
],
"model": "deepseek-reasoner"
}
================================================================================
[2025-06-22T20:16:04.675Z] PROMPT (model: deepseek-reasoner):
## Relevant Files
### File: src/main.ts
...
Please provide specific suggestions for refactoring with example code structure where helpful.
================================================================================
[2025-06-22T20:19:20.632Z] RESPONSE (model: deepseek-reasoner):
Based on the analysis, here are the key refactoring suggestions to improve separation of concerns and maintainability:
...
This refactoring maintains all existing functionality while significantly improving maintainability and separation of concerns. The new structure makes it easier to add features like new LLM providers, additional context sources, or alternative prompt formats.
Tokens: 3440 input, 5880 output | Cost: $0.014769 (input: $0.001892, output: $0.012877)
CLAUDE.md example
While not strictly necessary, to help Claude Code understand when and how to use this tool, you can optionally add something like the following to your project's CLAUDE.md file:
## consult-llm-mcp
Use the `consult_llm` MCP tool to ask a more powerful AI for help with complex problems. Include files to git_diff when asking feedback for changes.
Use Gemini 2.5 Pro.
CRITICAL: When asking, don't present options, this will bias the answer.
Claude Code seems to know pretty well when to use this MCP even without this instruction however.