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🧠 Lemma

A memory your AI agent can verify, and a context window that only holds what matters.

Coding agents forget everything between sessions, re-read the same files, and dump whole test logs into their context. Lemma is a local MCP server (plus an optional proxy) that gives them a project memory checked against your actual code, trims what enters the context, and keeps the receipts — including what Lemma itself costs.

npm install -g @nxuss/lemma
lemma init      # wires Claude Code, Cursor, Codex, Windsurf, Kiro, OpenCode, Muse

That's it: your agent now has Lemma's tools. The dashboard opens at http://localhost:8081/dashboard/.

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Why Lemma

🧠 A memory that knows when it's out of date. The Brain stores fixes, decisions and context in a local index (BM25, no embeddings service, no cloud). Every memory is tied to the files and symbols it's about, so when the code changes it comes back stale instead of confidently wrong — and a memory with no evidence is labelled as such, never sold as a verified answer.

✍️ It fills itself. A test, build or lint command that goes red → green is saved as fix: <the error> with the diff that fixed it. Commits become memories. Next time the same error shows up, the agent is pointed at the fix — through hooks in Claude Code, Codex, Cursor and OpenCode, for zero model tokens.

👥 Shared through git. brain_team push writes verified memories into the repo, one reviewable JSON file each. Teammates pull them on merge/checkout, re-verified against their checkout.

✂️ Less noise in the context. Large search results are capped, failing test/tsc/lint output is distilled to the failures that matter (the full log stays retrievable), and a command that prints the same thing twice comes back as IDENTICAL or a diff. Only the tools your project needs are advertised; the rest are one lemma_toolbox call away.

🔒 Private by default. API keys, credentials and PII are masked in file reads, searches and command output before they reach the model. Commands run with a minimal environment and workspace-bound paths, or in an opt-in Docker sandbox. Everything binds to 127.0.0.1.

📊 Numbers you can check. Lemma records what it saves and what it spends — its own prompt, tool schemas and every result it adds to the context — and the dashboard shows the net balance next to the gross. A cache hit says it's a cache hit; token_receipt shows how each answer was produced.

🧰 Static intelligence without tokens. Dependency graphs, coupling/risk scores and AST symbol lookups computed locally with the TypeScript compiler, plus surgical AST edits instead of full-file rewrites. C# gets the parts that are real; the rest says fallback instead of pretending (capability_matrix).

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Free vs Pro

61 of the 111 tools are free, including all memory, upkeep and export tools and the 22 infrastructure tools (Jenkins, OKD/OpenShift, Terraform). Pro adds writing and patching, search_workspace, run_workspace_command, static analysis, PR review and auto-heal.

	Free	Pro
Memory	search_memory, store_memory, get_memory, update_memory, verify_memory, brain_team, brain_upkeep, brain_export…	get_telepathic_hints, semantic_dedup_guard, local_semantic_autofix
Context	read_workspace_file, scrub_privacy, token_budget, token_receipt, auto_context_bundle	get_ast_hologram, smart_file_slice, get_symbol_surgical_context
Workspace	—	apply_workspace_patch, write_workspace_file, run_workspace_command, validate_patch_sandbox, surgical_ast_insert
Analysis & review	type_coverage_report, git_blame_heat	depgraph, entropy_score, refactor, review_diff, review_pr, test_oracle
Infrastructure	all 22 infra_*, jenkins_*, okd_*, terraform_*	—

Without a license, Pro tools aren't advertised to the model at all. Full list: lemma_toolbox { "action": "list" }. Get Pro: lemma activate <key> → lemma.nxus.studio/upgrade.

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Setup

Client	How
Claude Code, Cursor, Codex, OpenCode, Windsurf, Kiro	lemma init in the project
Muse	Installed on npm i -g; lemma call <tool> '<json>' works from any shell
Claude Desktop / any MCP client	{ "command": "npx", "args": ["-y", "@nxuss/lemma", "mcp"] }

lemma init also installs the hooks that feed the Brain (git post-commit / post-merge / post-checkout, and post-tool hooks for Claude Code, Codex, Cursor and OpenCode). Existing hooks are kept; --no-hooks skips them. Health check: lemma doctor.

CLI

Command	What it does
lemma init	Configure MCP and hooks for this project
lemma start / stop / status	Proxy + dashboard on localhost:8081 (an MCP server starts it on its own when none is running)
lemma stats	Net token and cost report
lemma mcp	Run the MCP server on stdio
lemma call <tool> [json]	Call one tool from a shell, for CLIs without MCP
lemma doctor	Check the installation
lemma activate <key>	Activate Pro

Configuration…