TN Garmin MCP

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An MCP server for training analysis on top of Garmin Connect: not "another VO2max dashboard", but enriched, per-profile access to your own data right inside a Claude chat — HR/pace distribution shapes, decoupling, pace-bucketed biomechanics, lactate marks anchored to the exact second they were taken, cross-period aggregates. Methodologically rejects device-side estimates (VO2max / training-effect / out-of-the-box thresholds) — only measurable facts and derivations you can trace, no hidden models.

Two layers, both served over MCP:

• garmin-tn (profile-aware, recommended) — enriched analysis plus your own lactate marks and notes. One connector = one Garmin account/profile. Multiple people/accounts → multiple connectors; data never crosses between them.

• garmin-raw (raw, optional) — unprocessed HR/cadence/power/stride/ elevation per lap and per second, comment-based lactate. Single account per server, no profiles. Useful if you want raw data directly or a JSON export for external analysis.

If unsure what you need, install garmin-tn — it's the primary path.

Requirements

Python 3.10+ and uv. Claude Desktop for MCP access (connectors run over local stdio — no server or hosting needed).

Related MCP server: Garmin MCP Server

Fresh install

git clone https://github.com/asilenin/Garmin-TN-MCP.git
cd Garmin-TN-MCP
uv sync

1. Authenticate with Garmin (once per account)

uv run garmin-raw-auth

Email, password, MFA code. Tokens land in ~/.garminconnect — this is the default account (see "Multiple profiles" below if you have more than one Garmin account, e.g. yourself + a training partner).

2. Prime the local cache

The profile layer keeps its own local database (~/.garmin-tn/profiles/<slug>/cache.db) — MCP tools read from it and never touch the network (see "How this works" below). Fill it once before first use:

uv run python garmin_raw/sync.py <slug>              # activity catalog (all dates)
uv run python garmin_raw/sync.py <slug> enrich 50     # enrichment + streams, newest first
uv run python garmin_raw/sync.py <slug> fetch-aux     # laps + comments (lactate)

<slug> is the connection key <provider>-<user> (e.g. garmin-anton, garmin-mila; letters/digits/-). With years of history, run enrich in batches (enrich 100, then again) — it skips what's already enriched. On a large archive, first enrichment can take over an hour — expected, Garmin has no bulk endpoint for per-second streams.

Check what's accumulated:

uv run python garmin_raw/sync.py <slug> status

3. Connect to Claude Desktop

uv run tn-install <provider> <user>

A connection is (provider, user) — e.g. garmin anton. Appends a tn-<provider>-<user> connector (e.g. tn-garmin-anton) to claude_desktop_config.json without touching anything else (backs up before writing), with env TN_USER/TN_PROVIDER. Repo path is auto-detected; pass it explicitly if needed: uv run tn-install <provider> <user> /full/path/to/repo.

Restart Claude Desktop (Cmd+Q on macOS — not just closing the window) — 15 garmin_* tools will appear.

Multiple profiles (different Garmin accounts)

Example: your own account plus a training partner's.

# for the account authenticated via garmin-raw-auth above — reuse its tokens:
uv run tn-install garmin anton --tokenstore ~/.garminconnect

# for a second account — authenticate separately into its own token folder
# (connection slug = <provider>-<user>, e.g. garmin-mila):
mkdir -p ~/.garmin-tn/profiles/garmin-mila/tokens
GARMIN_TOKENSTORE=~/.garmin-tn/profiles/garmin-mila/tokens uv run garmin-raw-auth
uv run python garmin_raw/sync.py garmin-mila
uv run python garmin_raw/sync.py garmin-mila enrich 50
uv run python garmin_raw/sync.py garmin-mila fetch-aux
uv run tn-install garmin mila

--tokenstore is needed only if the profile has no token folder of its own — it's an explicit flag, not a hidden default: install warns at setup time if no tokens were found anywhere. A profile with its own tokens (~/.garmin-tn/profiles/<slug>/tokens/) keeps using them and never mixes up with another account.

With several profiles installed, Claude sees all of them at once — garmin_compact, garmin_add_lactate, etc. operate in the context of whichever connector you're using; profiles never cross (the profile is deliberately absent from tool names — it's determined by which connector you use, not by anything you type in chat).

Updating the code

cd Garmin-TN-MCP
git pull
uv sync

No need to touch Claude's config — the connector only stores the repo path, new code is picked up on Claude Desktop's next launch (restart it). If the local database schema changed, migration runs automatically on first access, additively (existing data is preserved).

Syncing — keeping the cache fresh

MCP tools never touch the network — they only read the local cache (fast, predictable, no network failures mid-conversation). New activities need to be pulled in explicitly:

uv run python garmin_raw/sync.py <slug>              # new activities into the catalog
uv run python garmin_raw/sync.py <slug> enrich 20     # enrich the newest 20
uv run python garmin_raw/sync.py <slug> fetch-aux     # laps/comments for what's missing

Run this before discussing recent activities (or on a schedule). sync.py <slug> recompute recomputes all metrics from already-downloaded raw data (run after a code update if the computation logic changed; no network needed).

Triggering a sync from inside the Claude chat itself ("download today's run") is planned — see the backlog. For now, syncing is a separate terminal step.

Uninstalling

uv run tn-uninstall <provider> <user>    # remove one connection connector
uv run garmin-raw-uninstall              # remove the raw connector (if installed)

Both only edit Claude's config (with a backup) — code and data are untouched. Restart Claude Desktop afterward.

Full cleanup:

rm -rf ~/.garmin-tn                # local databases for all profiles
rm -rf ~/.garminconnect            # default account's tokens
cd .. && rm -rf Garmin-TN-MCP      # the repository itself

Tools (garmin-tn, profile-aware)

Lactate — anchored to the exact second

Three sources, of differing value:

1. Garmin comment (LA:6.1, optionally with context: LA:6.6 @rep12) — read automatically, but it's a bare number: no way to know the HR/pace it was taken at.

2. ConnectIQ TN Splits View watch app (numeric field in the stream) — also read automatically, has a lap anchor, but needs a third-party watch app.

3. garmin_add_lactate — the recommended way. Tell the chat when the reading was taken (elapsed time or lap number) — the tool resolves it to the exact second in the stream and returns the HR/pace at that moment. The difference matters: "5.1 mmol at HR 129 deep in recovery" and "5.1 mmol at HR 175 mid-effort" are different physiology behind the same number.

Three ways to specify the second (exactly one):

garmin_add_lactate(id, 5.5, at_elapsed_s=2190)     # 36:30 from start (as written in comments)
garmin_add_lactate(id, 5.5, at_ms=1782884498000)   # absolute timestamp (exact path)
garmin_add_lactate(id, 5.5, user_ref="lap14")      # end of Garmin lap 14

If the activity isn't cached yet, sync first. If the per-second stream hasn't been downloaded yet, the mark is saved and resolved automatically on the next enrich.

How this works (short version)

MCP tools only read a local SQLite database (~/.garmin-tn/profiles/<slug>/cache.db) — this gives fast, predictable responses and keeps profiles isolated from each other: each connector is hard-wired to its own file and its own tokens via environment variables in Claude's config (not anything typed in chat). Filling the cache is a separate, explicit operation (sync.py) — only it touches the network.

Notes

• Garmin PRs are an auto-detected fastest split, not a race-protocol time; they can beat official results. For fitness markers, prefer protocol races.

• PII (owner name/ID) is stripped from the local cache and output, case-insensitively.

• If tools return empty/errors on a previously-synced profile, it's almost always expired Garmin tokens: uv run garmin-raw-auth (with GARMIN_TOKENSTORE=<profile path> for a non-default account), then sync.

Raw layer (garmin-raw, optional)

A separate single-account MCP with no profiles and no enrichment — raw data only. Useful for JSON export to external analysis, or if the profile layer isn't needed.

uv run garmin-raw-install     # garmin-raw connector in Claude
uv run garmin-raw-export --start 2026-06-01 --end 2026-06-21   # or a JSON export

Garmin disclaimer

This project talks to Garmin Connect through an unofficial route (the community library python-garminconnect, which logs in with your own credentials). It is not affiliated with, endorsed by, or supported by Garmin. Use may be subject to Garmin's Terms of Service; you use it at your own risk. No warranties are made (see LICENSE).

Authorship & AI generation

This project was designed and written by Claude (Anthropic's AI assistant) during an extended pair-programming session, under the direction, review and testing of Anton Silenin. The methodology, architecture, debugging and final verification against real Garmin data were done collaboratively in conversation: the human author initiated the work, made the design decisions, validated every step on live data, and is the copyright holder.

AI-generated output carries no separate human authorship under copyright law, so it is released under the human author's name (MIT, see LICENSE). This note is here for transparency, not as a license requirement. As with any AI-assisted code, review it before relying on it.