Weavatrix

Weavatrix — native MCP repository intelligence

[CI] [npm] [crates.io] [engine] [MIT]

Part of the Weavatrix ecosystem: evidence infrastructure for AI software agents.

Give your coding agent repository evidence before it starts guessing.

Weavatrix is the native MCP product that answers the questions agents otherwise invent: what breaks if this file changes, who consumes this n8n field, whether an MCP schema still accepts yesterday’s request, which viem call sites follow an ABI layout change, and whether .weavatrix/architecture.json still holds. 67 read-only operations, one revision-bound graph, no LSP and no prompt pack.

Codex, Claude Code, Cursor, and Grok get impact, architecture, APIs, Git history, duplicates, dead code, search, semantic links, temporal memory, exported n8n workflows (n8n_*), Dify YAML apps (dify_*), Agent Plugins/Skills/MCP catalogs (agent_*), Mermaid flowcharts (diagram_*), and Web3 ABI/consumer impact (web3_*). Those parsers are domains on Weavatrix Core, not new MCP products. Dedicated pages: n8n · Dify · parsers.

It does not answer from a larger grep or an invented confidence score. Every bounded result can carry the repository revision, file, line, extractor, evidence kind, and confidence that produced it.

Adjacent MCP tools (not this host)

This repository is the stdio MCP host and plugin pack. It pins weavatrix-rust. It does not grow a second indexer, and it does not compete with the engine crate for the same README story.

The host’s unique job is transport: profiles, watching, npm/crate distributions, and the 67-tool catalog over one engine session. Measured engine times live in weavatrix-rust benchmarks, not here.

Ecosystem place (UNDERSTAND)

Weavatrix (this) — code facts        │        ▼Weavatrix Loom — semantic composition (capabilities, registry, compile → Rust)        │        ▼Realforge — artifact construction (scaffold / package / deploy)

Loom consumes Weavatrix facts for semantic classification (e.g. “this fn is a candidate for data.json.parse@1”). Loom must not grow a second product code indexer. Normative Loom side: ADR-0012.

The same source is distributed in two forms:

The npm package exists for convenience; it does not contain a different JavaScript engine. Both distributions run the same native adapter and the same weavatrix-rust analysis engine. The separately versioned weavatrix-js package is the legacy JavaScript implementation used for compatibility and historical baselines; it is not bundled into weavatrix.

Install as a plugin

The repository ships one plugin bundle for Cursor, Codex, Claude Code, and Grok Build. Each client starts the published native npm distribution and loads the same read-only MCP tools. Its optional Weavatrix skill activates only for tasks that benefit from indexed, cross-file evidence; detailed tool routing is loaded separately when needed.

Cursor plugin

Search for Weavatrix in Cursor's Plugins view after its marketplace review is complete. The bundle can be tested before listing by copying or linking plugins/weavatrix to ~/.cursor/plugins/local/weavatrix and reloading the Cursor window.

Codex plugin

codex plugin marketplace add Weavatrix/weavatrix --sparse .agents/plugins plugins/weavatrixcodex plugin add weavatrix@weavatrix

Claude Code plugin

claude plugin marketplace add Weavatrix/weavatrix --sparse .claude-plugin pluginsclaude plugin install weavatrix@weavatrix

Grok Build plugin

grok plugin marketplace add Weavatrix/weavatrix

Open /marketplace and install Weavatrix. Grok also accepts the plugin directly with grok plugin install Weavatrix/weavatrix#plugins/weavatrix.

Install in 30 seconds

Run the convenient prebuilt npm distribution:

npx -y weavatrix mcp .

Or install the same MCP product through Cargo:

cargo install weavatrixweavatrix mcp .

Codex

# ~/.codex/config.toml[mcp_servers.weavatrix]command = "npx"args = ["-y", "weavatrix", "mcp", "."]

Claude Code

claude mcp add weavatrix -- npx -y weavatrix mcp .

Grok

grok mcp add weavatrix -- npx -y weavatrix mcp .

Everything after -- is the server command, so -y reaches npx instead of Grok. The equivalent hand-written entry:

# ~/.grok/config.toml[mcp_servers.weavatrix]command = "npx"args = ["-y", "weavatrix", "mcp", "."]startup_timeout_sec = 120

The package unpacks to roughly 40 MB, so the first npx launch can spend longer fetching it than Grok's 30-second default startup timeout allows. startup_timeout_sec covers that once; npm i -g weavatrix or cargo install weavatrix removes the cold start for every later session.

Use --scope project to write .grok/config.toml inside a repository instead, so a clone carries the server with it.

Cursor

Prefer the Cursor plugin (it already passes ${workspaceFolder}). For a hand-written user entry, pin the server to the open workspace — not the host process cwd — and avoid running both a user MCP and the plugin at once:

// ~/.cursor/mcp.json{  "mcpServers": {    "weavatrix": {      "command": "npx",      "args": ["-y", "[email protected]", "mcp", "${workspaceFolder}"]    }  }}

Profiles expose bounded views of the same engine:

npx -y [email protected] mcp . --profile=allnpx -y [email protected] mcp . --profile=codenpx -y [email protected] mcp . --profile=seonpx -y [email protected] mcp . --profile=n8nnpx -y [email protected] mcp . --profile=difynpx -y [email protected] mcp . --profile=agentnpx -y [email protected] mcp . --profile=diagramnpx -y [email protected] mcp . --profile=web3

The npm package contains native binaries for Windows x64/arm64, macOS x64/arm64, and glibc Linux x64/arm64. It has no install script and performs no runtime download.

Halve every answer on a client that reads structured output

An MCP result carries the payload twice: once as structuredContent, and once mirrored into a text block for clients that read only content. The mirror is the pretty-printed copy, so it is the larger of the two.

npx -y weavatrix mcp . --output-format=structured

Measured on run_audit over a real repository, the response falls from 8931 to 3589 bytes, 59.8% smaller. Whether a client reads structured output does not change between calls, so it is chosen once at startup rather than restated as an argument on every call; WEAVATRIX_OUTPUT_FORMAT=structured does the same where a flag is awkward, and a call that names its own output_format still wins.

json is the default and keeps the mirror, because a client that ignores structuredContent would otherwise see an empty result. text returns only the text block, but that block still contains serialized JSON; it is not a summary mode. For an architecture question, call architecture_inventory without arguments and summarize its bounded style hypotheses in prose.

What the new domains actually answer

What an agent can ask

What breaks if I change src/auth/middleware.ts?Trace POST /api/orders through this backend and its clients.Which production symbols are dead, and what evidence proves it?Show duplicate implementations but suppress router boilerplate.Which dependency violates .weavatrix/architecture.json?Find every GraphQL, gRPC, Kafka, RabbitMQ, NATS, JMS, SQS, or SNScontract affected by this branch.Build the smallest source bundle needed to edit this symbol safely.Show me this file as it was two commits ago, without a checkout.Suggest internal links without mixing inferred SEO relationships intothe deterministic code graph.If I change the email recipient in this exported n8n workflow, who reads it?If I change start_node.query in this Dify YAML, which nodes consume it?Did this MCP catalog make `id` an integer so old string requests fail?Which viem `decodeEventLog` sites still assume the old Deposit layout?Is this Mermaid arrow a real call, or only declared architecture?

The graph is built once per revision. Impact, API traces, health findings, architecture checks, clone families, and context bundles therefore agree about repository identity instead of recomputing incompatible partial views.

See it answer

Real answers from Weavatrix analyzing its own repository at commit ec8bf30, abridged (…) and with the local root shortened. Reproduce any of them with weavatrix tool <name> . '<arguments>'.

Orient in one call — and know exactly which repository and revision answered:

{"name": "graph_stats", "arguments": {}}

{  "nodes": 1294,  "edges": 2771,  "freshness": {"state": "CURRENT", "source_revision": "sha256:dd3d96d3…"},  "relations": {"calls": 651, "contains": 1271, "imports": 419, "references": 314, "…": "…"},  "repository_context": {    "root": "…/weavatrix",    "git_head": "ec8bf3041588623f23ec5e7ebbaff3a333da9ca7",    "scan_revision": "sha256:dd3d96d3…",    "graph_age_seconds": 0  }}

Every answer carries that repository_context block. From 1.11.1, each MCP process pins its launch root for the session: open_repo to another path is refused unless you started with --allow-retarget, and omitted expected_repository is filled from that pin. Still pass "expected_repository": "weavatrix" when you already know the folder name — a mismatched server fails loudly instead of answering about the wrong repository.

Blast radius before you edit:

{"name": "get_dependents", "arguments": {"label": "file:src/mcp/server/mod.rs", "max_nodes": 6}}

{  "dependents": [    {"distance": 1, "node": {"id": "file:src/main.rs", "language": "rust"}},    {"distance": 1, "node": {"id": "file:src/mcp/mod.rs"}},    {"distance": 1, "node": {"id": "file:src/mcp/server/tests/catalog.rs"}},    {"…": "…"}  ]}

The file as it was — no checkout (git_read_blob):

{"name": "git_read_blob", "arguments": {"path": "Cargo.toml", "revision": "HEAD~3", "max_bytes": 400}}

{  "path": "Cargo.toml",  "revision": "70b5bc788a10ec89ab28b9ecbc005e3b9c7f9829",  "oid": "f5f54bac00a4feb6e965c0d87c5c6d4d25782e91",  "kind": "utf8-text",  "lines": ["[package]", "name = \"weavatrix\"", "version = \"1.9.2\"", "…"],  "size_bytes": 1224,  "returned_bytes": 400,  "truncated": true}

Three commits before ec8bf30 this package was 1.9.2; the agent reads that follow-up to a diff without touching the worktree. Binary blobs fail closed instead of being decoded into garbage.

The 67 read-only operations

| APIs and transports | list_endpoints, trace_endpoint, trace_api_contract | | Architecture | architecture_inventory, get_architecture_contract, verify_architecture, verify_capabilities, explain_architecture_violation, propose_architecture_exception | | Local CI | ci_restrictions, explain_restriction | | Git and repositories | git_history, git_read_blob, cross_repo_git, open_repo, list_known_repos, rebuild_graph | | Native extensions | vector_search, semantic_link, seo_link_suggestions, memory_context | | n8n workflows | n8n_inventory, n8n_trace, n8n_context | | Dify apps | dify_inventory, dify_trace, dify_context | | Agent packages | agent_inventory, agent_trace, agent_context, agent_change_impact | | Mermaid diagrams | diagram_inventory, diagram_trace, diagram_context | | Web3 integration | web3_inventory, web3_trace, web3_impact, web3_context |

coverage_map is an ingest, not a test runner. Pair it with Weavatrix Quality quality_run, which writes .weavatrix/coverage/lcov.info onto the engine search path. A missing report is unmeasured, not 0%.

Every operation is read-only with respect to the analyzed repository. Pagination and explicit limits bound large neighborhoods, histories, searches, and contract inventories.

build_graph and architecture_inventory now share one typed build model. architecture_inventory defaults to detail:"summary": complete graph totals, representative component paths, dominant coupling, and clearly labeled cycle candidates in a bounded response. It also reports independent style hypotheses for modular source organization, onion dependencies, ports-and-adapters, layered dependencies, and deployment topology. Each hypothesis states its evidence, contradictions, unknowns, and status; the declared contract style is never treated as proof. Request detail:"full" for paged edges and source evidence; output_format:"text" does not reduce detail. In Rust, an explicit impl Trait for Type can support onion or ports-and-adapters findings; an inherent impl Type cannot. They preserve nested Cargo, npm/TypeScript, Go, and Python components, many-to-many declared memberships, collision-free identities, configuration predicates, and immutable source evidence. Component totals and SCC/cycle witnesses are computed on the complete projection before pagination, so a response cap cannot change the graph verdict. Quotient component cycles are reported as architectural cycles, not mislabeled as symbol recursion.

ci_restrictions reuses that target-aware topology while reading local GitHub Actions workflows and literal checks. Root files, repeated commands, UTF-8 BOM offsets, optional events, base branches, and changed-path scenarios retain their exact evidence. Dynamic conditions, mutually exclusive configuration unions, actual runs, and remote required checks remain explicit unknowns; a workflow file alone never establishes a passing gate.

Languages and repository surfaces

The engine recognizes 24 named surfaces across 65 registered extensions. Support is evidence-specific: lossless tokenization is not presented as typed semantic resolution.

Cross-surface passes connect HTTP routes and calls, GraphQL operations and schema types, gRPC services and streaming modes, and Kafka, RabbitMQ/AMQP, JMS, NATS, SQS, and SNS producers and consumers. Package manifests, lockfiles, coverage artifacts, and architecture contracts become evidence too.

Dynamic dispatch that cannot be proved stays unresolved. Static reachability is not called measured coverage, and absent optional evidence remains explicitly absent.

Workflow export domains

n8n and Dify are not new MCP servers, editors, or runtimes. They are domains on the same evidence graph. JSON still goes through the JSON adapter; YAML still goes through the Kubernetes adapter. After parse, a recognized export becomes typed nodes, ports, and relations. A package.json does not become an n8n workflow. A Kubernetes ConfigMap does not become a Dify app.

flowchart LR  export["n8n JSON / Dify YAML in git"] --> parse["Existing JSON / YAML parse"]  parse --> domain["After-parse domain"]  domain --> graph["Revision-bound evidence graph"]  graph --> inventory["inventory"]  graph --> trace["trace"]  graph --> context["context"]

Product pages: n8n · Dify · parsers.

n8n (shipped in 1.12.0)

Exported workflow JSON → n8n_inventory, n8n_trace, n8n_context.

Use this when the question is about an export already in git: who reads this field, which node feeds that output, what this file actually contains. The agent stays on the repository revision. It does not log into n8n.

• Identities are scoped per file. The same display name in two workflows stays two nodes; a short label that hits both is ambiguous.
• flows_to is control flow. depends_on_output is data. They are not walked as one relation.
• Every $('Name') / $node / $items occurrence is bound, not the first match only. .item and .first() stay distinct. A dynamic $('' + prefix) is unresolved:dynamic_node.
• typeVersion 1.7 is not coerced to an integer.
• Missing subworkflows are “not provided”, not “deleted”.
• Secrets, cookies, auth headers, URL credentials, pinData, staticData, and $env values stay off the default graph and context.

npx -y [email protected] mcp . --profile=n8n

Dify (shipped in 1.13.0)

Exported DSL YAML → dify_inventory, dify_trace, dify_context.

Use this when the question is about a local YAML export: which nodes consume start_node.query, which Code or Template regions mention a selector, what the export omitted. The agent stays on the repository revision. It does not call the Dify console.

• AppKey is corpus + artifact origin. data.title is display only.
• Node subject type is node.data.type, not the canvas custom UI type.
• Iteration / loop children keep parentId scope. They are not flattened.
• {{#start_node.query#}} markers and structured selectors become reads_variable / depends_on_output with source spans.
• Conversation assigner reads and writes stay typed. Code and Template regions are inventoried, not executed.
• Chat and other modes are recognized. An unsupported mode is structure_only, not a successful empty graph.
• Environment values and credential-shaped labels are omitted from default inventory and context.

npx -y [email protected] mcp . --profile=dify

Agent packages (shipped in 1.14.0)

Local plugin, skill, catalog, and observation files → agent_inventory, agent_trace, agent_context, agent_change_impact.

Use this when the question is about a package already in git: which catalog tools a plugin exposes, which MCP config binds a server, whether two catalog snapshots stayed compatible on the supported schema subset. Unsupported keywords stay undetermined. Duplicate tool labels are ambiguous-identity. The agent does not launch commands, and allowed-tools is a declaration, not a proven call.

npx -y [email protected] mcp . --profile=agent

Mermaid diagrams (shipped in 1.14.0)

.mmd, .mermaid, and Markdown/MDX fences → diagram_inventory, diagram_trace, diagram_context.

Drawn arrows are declared_architecture, never Calls. They do not clear dead-code findings. Bindings come only from .weavatrix/diagram-links.json. Name match is not exact. change_impact.documentation is separate from production impact.

npx -y [email protected] mcp . --profile=diagram

Web3 integration (shipped in 1.15.0)

ABI JSON, supplied solc/Foundry artifacts, and static viem/wagmi consumers → web3_inventory, web3_trace, web3_impact, web3_context.

Use this when a contract interface changed and you need the proven client call or decoder sites. Consumers stay on the paired artifact files. A missing candidate is missing_input, not a removed member. Comment properties inside a call object are not the callee. An indexed-mask event change can silently misdecode. ABI equality is not a live deployment proof. The engine does not compile contracts, call RPC, or open a wallet.

npx -y [email protected] mcp . --profile=web3

Compared with adjacent tools

These tools solve different jobs. Weavatrix does not replace a live console or a CI linter.

Weavatrix answers “who consumes this variable in this repository revision?” It does not execute expressions, Jinja, or Code nodes, and it does not deploy or publish the app.

Shared engine bench

n8n and Dify evidence is produced in-process after parse. There is no HTTP hop to an n8n or Dify host for those tools. We do not invent per-parser millisecond numbers.

The measured installed MCP boundary (2026-08-03, packaged 1.2.0 / weavatrix-rust 2.1.1 vs weavatrix-js 0.3.15, same JavaScript service repository) is the honest engine figure those domains share:

Methodology: Release evidence and docs/benchmarks.md.

What this is not

No expression or Jinja execution. No n8n or Dify deployment. No automatic edits. No new graph engine. Unknown DSL versions and hidden export fields are not pretended as full support.

Product boundary

Weavatrix is deliberately split into a protocol-independent engine and a thin product adapter:

coding agent    |    | MCP over stdio    vweavatrix 1.17.5    profile catalog · session refresh · filesystem watcher · MCP framing    |    vweavatrix-rust 2.17.4    typed graph · analysis pipeline · 67 product operations including local CI, n8n, Dify, agent packages, Mermaid, and Web3    |    +-- weavatrix-scan      repository discovery and selection    +-- weavatrix-parse     lossless tokenization and structural facts    +-- weavatrix-graph     graph model and algorithms    +-- weavatrix-git       direct Git-object evidence    +-- weavatrix-search    bounded content and index search    +-- vector / clone / semantic / memory components

This repository owns the MCP transport, watcher, native npm packaging, and client-facing identity weavatrix. The weavatrix-rust crate owns the reusable engine and standalone diagnostic CLI; it is not an MCP server. weavatrix-stream is a separate crate that provides adapters for Weavatrix observations; this host does not take a runtime dependency on it. Its separate binary therefore reports weavatrix-rust <engine-version> from --version, while this product reports both the weavatrix product version and its embedded engine version.

Rust applications that want to embed the engine should depend on the crate:

[dependencies]weavatrix-rust = "2"

use weavatrix_rust::{Weavatrix, operations};
let mut engine = Weavatrix::open(".")?;let result = operations::call(    &mut engine,    "change_impact",    blazingly_json::json!({"files": ["src/auth.rs"]}),)?;# Ok::<(), weavatrix_rust::Error>(())

Release evidence

The release gate measures the installed npm boundary, not an in-process microbenchmark. Each side is packed, installed into an isolated npm root, and started with empty HOME, XDG, AppData, and graph caches. The harness validates package/native/initialize identity, advertised operations, successful MCP results, and process cleanup.

The packaged 1.2.0 product, backed by weavatrix-rust 2.1.1, was measured on 2026-08-03 against installed weavatrix-js 0.3.15 on the same real JavaScript service repository (2,165 nodes / 5,712 edges), three paired fresh processes per tool with alternating start order:

Both release thresholds (24x cold, 30x warm) passed, and the paired cold median sits slightly above the 30.34x recorded for the 1.0.0 baseline, so the three new tools, token budgets, and dependency-injection evidence did not regress the installed boundary. Raw evidence and methodology live in benchmark-results and docs/benchmarks.md.

Safety and determinism

• read-only MCP surface;
• no source-writing operation;
• no execution of repository code;
• no spawned git, rg, language server, Node, or Python from the native engine;
• no network path in repository analysis;
• no npm install script or post-install binary download;
• bounded files, bytes, results, histories, and pagination;
• stable ordering and revision provenance;
• unsafe Rust forbidden in first-party engine crates;
• MIT license for the product, engine, and maintained first-party components.

Filesystem watching only invalidates derived state. The next operation performs a bounded refresh; it never edits the repository. Watching costs constant memory: every event is classified as it arrives and collapses into one pending change flag, so build output churning under target/ or node_modules/ never accumulates in a server that is sitting idle between tool calls.

Architecture and development

The product adapter follows ports and adapters:

inbound MCP server        |application session        |repository + change-monitor ports        |weavatrix-rust adapter · notify adapter

mcport is isolated to the inbound server. The application layer sees neither MCP frames nor notify events, and the engine sees neither dependency.

Local gates:

cargo fmt --all -- --checkcargo clippy --all-targets -- -D warningscargo test --all-targets

Native npm artifacts are built by scripts/build-npm-packages.mjs; publication is performed by the protected GitHub Actions workflow after all platform binaries, identity checks, package checks, and installed-boundary gates pass.

Documentation

• Getting started
• Tool reference
• Evidence model
• Language support
• MCP product architecture
• npm distribution
• Dependencies
• Benchmarks
• n8n export evidence
• Dify export evidence
• Workflow parsers
• Engine API and architecture

License

MIT. See LICENSE.