Aimm

Local Model Context Protocol server for the AI Model Manager. Captures SQL data-model metadata as one JSON file per project (<slug>.aimm.json) and exposes it to Claude Code (or any MCP client) over stdio.

Fork of the AIMM VS Code extension, rebuilt in Python with no UI: just tools the agent calls. Both the VS Code extension and this server read/write the same project-file format — share a project by committing one .aimm.json to your repo.

Why this exists

The VS Code extension lives inside an editor. This fork lets you skip the editor entirely — install once with claude mcp add, and any Claude session on the machine sees the same models.

Install

One line. Claude Code spawns the server via uvx (uv's npx) — no prior install, no setup.

claude mcp add aimm --scope user -- uvx aimm-mcp

First connection downloads the package (a few seconds). Subsequent connections are cache-served.

For testing from a local checkout before PyPI, see LOCAL_INSTALL.md.

Where state lives

Two concepts: machine-local sidecars (always at ~/Documents/AIMM/) and project files (anywhere you point them, default the same folder).

~/Documents/AIMM/                    machine-local, never moves
├── state.json                       which folder + which active project
├── discovered_joins.json            scan output (not project state)
└── diagnostics.log                  ODBC query append-log

<projects_folder>/                   defaults to ~/Documents/AIMM/
├── customer_warehouse.aimm.json     one project
├── reporting_model.aimm.json        another project
└── …

A team checks <projects_folder> into a git repo. The agent runs aimm_set_projects_folder to point at the local clone, then aimm_list_projects + aimm_set_active_project to pick one. The "active project" pointer survives across Claude Code sessions.

No derived snapshots on disk. Renderings (XML / markdown / raw JSON) happen in-memory when aimm_read_project_context is called.

Engines

Three engines via ODBC: trino, sql_server, databricks. Connection descriptors carry a DSN name (system DSN registered at the OS level) plus the catalog / database qualifier.

Tools

Session / context

The agent must select an active project before any project-touching tool runs — these tools handle that bootstrap.

• aimm_set_projects_folder — point the server at a folder of .aimm.json files (defaults to ~/Documents/AIMM/). Use to switch to a team repo of shared projects. Clears the active pointer.
• aimm_list_projects — enumerate .aimm.json files in the current folder with their internal project name + updated_at.
• aimm_set_active_project — pick one as active. Subsequent tool calls read and write that file.
• aimm_show_active_project — report the current pointer state (folder + active file + on-disk status).

Project + context

• aimm_init_project — create a new <slug>.aimm.json (slug derived from name) in the current folder, set it as active.
• aimm_read_project_context — return the entire active project. Formats: xml (default), markdown, json (raw bytes of the active file).

Connections + live catalog

• aimm_upsert_connection — create / update a connection descriptor. Validates Trino catalog requirement.
• aimm_list_system_dsns — pyodbc.dataSources() wrapper for discovery before upsert.
• aimm_browse_connection — drill into schemas / tables / columns on a live connection. Optional case-insensitive search filter.
• aimm_refresh_columns — re-fetch column shapes from information_schema and merge back into the active project (preserves user-edited PK / FK / description flags).

Table mutations

• aimm_update_table — patch any non-identity field on a tracked table. Creates on first patch.
• aimm_set_primary_key — atomically set primary_keys + flip is_primary_key on matching columns.
• aimm_add_relationship — append an FK edge (idempotent on duplicates, composite keys supported).
• aimm_add_upstream — append a lineage edge.

Semantic context (the "what it means" layer)

The structural fields above tell the agent what's there. These tell it what those things mean — captured once, surfaced on every subsequent aimm_read_project_context call.

• aimm_set_table_grain — one-line "what is a row?" per table.
• aimm_add_pitfall — append-with-dedupe to a table's "don't do this" list.
• aimm_set_column_classification — flag a column as pii / phi / restricted / internal / public.
• aimm_add_glossary_term — upsert a domain-vocabulary entry.
• aimm_add_measure — upsert a KPI / metric with definition + formula.
• aimm_update_project_config — patch the project header (description, conventions, dialect, default_connection, modeling_paradigm, tags).

Folder scan for joins

• aimm_scan_folder_for_joins — walk a local folder of .sql files, extract JOIN clauses via sqlglot (multi-dialect fallback: tsql → spark → none), persist canonical edges to ~/Documents/AIMM/discovered_joins.json. Works without an active project.

Diagnostics

• aimm_show_diagnostics_log — tail of diagnostics.log where every ODBC query is recorded.

Pending changes

• aimm_get_pending_changes — per-tracked-table diff between authored columns and the live information_schema shape.

Why ODBC?

Every warehouse this targets exposes an ODBC driver. We never run user SQL — only information_schema reads for column / table / schema metadata. Drivers stay read-only at the credential level.

Development

uv sync --dev
uv run python -m aimm_mcp        # starts the MCP stdio server
uv run pytest -q                 # tests

License

MIT.