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Fit File Forge

Forge Labs LLC v1.2.0

Your training, analyzed

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From the developer

Declared capabilities

  • Analyze a training session in detail
  • Track fitness, fatigue and training load
  • Predict race times and best efforts

Cost & access

The plugin does not sell anything or take payments. Most tools need a Fit File Forge plan; when an account doesn't have one, the tool says so and links to an informational plans page.

Declared limitations

  • Health data Fit File Forge does not collect. Explain that Fit File Forge has no sleep or HRV data and cannot answer this. It may check what the athlete's account holds, but must not fabricate a value or present any sleep/HRV figure.
  • Location data is never shared. Explain that GPS coordinates and route maps are never shared. It may look up the run, but no coordinates, addresses or map are shown and none are fabricated.
  • Purchases are not supported in the plugin. Explain that it cannot upgrade the account or charge a card; do not invoke a purchase or account-change tool and do not claim an upgrade occurred.

Onboarding example

Analyze my latest workout in detail.
Sources & dates

Developer declarations; not independently tested. Listing last checked Nov 12, 2026. Package observed Nov 12, 2026.

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Description

From the marketplace listing

Fit File Forge connects ChatGPT to your endurance training. Ask how a session went and get a detailed analysis from your real data: pacing and splits, heart rate and power, climbing, time in zones and a chart of the whole session. Ask whether your fitness is building, how fatigued you are, or what time is realistic for your next 5K, half or marathon. Describe a workout in plain words ("6 × 800 m at 5K pace on Thursday") and Fit File Forge builds a valid structured Garmin workout, shows it, and sends it to your watch only when you ask. For runners, cyclists, swimmers and triathletes who train with a Garmin watch and use Fit File Forge (fitfileforge.com). You sign in with your Fit File Forge account; activity data needs Garmin Connect linked in Fit File Forge with activity sharing on. What it never shares: GPS locations or routes, original activity files, or health data such as sleep or HRV (Fit File Forge doesn't collect it). You choose what ChatGPT may see and do when you connect, and you can disconnect at any time. Training information only, not medical advice.

Language: English · Automatically detected from descriptions.

Matches for “split”

Exact text from the indicated source. A mention alone does not establish support for your task.

Publisher full description

Fit File Forge connects ChatGPT to your endurance training. Ask how a session went and get a detailed analysis from your real data: pacing and splits, heart rate and power, climbing, time in zones and a chart of the whole session. Ask whether your fitness is building, how fatigued you are, or what time is realistic for your next 5K, half or marathon. Describe a workout in plain words ("6 × 800 m at 5K pace on Thursday") and Fit File Forge builds a valid structured Garmin workout, shows it, and sends it to your watch only when you ask. For runners, cyclists, swimmers and triathletes who train with a Garmin watch and use Fit File Forge (fitfileforge.com). You sign in with your Fit File Forge account; activity data needs Garmin Connect linked in Fit File Forge with activity sharing on. What it never shares: GPS locations or routes, original activity files, or health data such as sleep or HRV (Fit File Forge doesn't collect it). You choose what ChatGPT may see and do when you connect, and you can disconnect at any time. Training information only, not medical advice.

What changed

· 4 observations

Capabilities & instructions

Skill instructions changed from “analysed” to “analyzed”.

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Positioning & listing

Capabilities updated; open the comparison for details. Default prompt changed from “Analyse my latest workout in detail.” to “Analyze my latest workout in detail.”. Default prompts updated; open the comparison for details. Short description changed from “Your training, analysed” to “Your training, analyzed”. 1 more...

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Technical updates · 1

Package or technical metadata updated

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· 5 observations

Capabilities & instructions

Skill instructions changed from “2. Call `get_athlete` once per conversation for the athlete's thresholds, units and what they allowed when connecting. 3. Read it fully: `get_activity` with...” to “Each hit's `capabilities` says what the session has: a `summary_only` one has only Garmin's summary, so there are no...

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Capabilities & instructions

Skill instructions: added “To cite a recent session, pick one whose `find_activities` `capabilities` shows it can be analysed (not `summary_only`).”.

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Technical updates · 3

Package or technical metadata updated

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Package or technical metadata updated

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Package or technical metadata updated

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Keywords

Files & skills

File archives

Plugin package8 files · 6.9 KBBrowse files →
Skill instructions
plan-week2.27 KB

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---
name: plan-week
description: Plan or adjust a training week and put the workouts on the athlete's Garmin watch with Fit File Forge. Use when the user asks for next week's plan, a race block, to rearrange or catch up after missed sessions, or to send workouts to their watch.
---

To plan a week:

A single workout the athlete has already described ("6 × 800 m at 5K pace on Thursday") is built straight away with `build_workouts`; the propose-first step below is for multi-day plans.

1. Read the athlete first: `get_athlete` (thresholds and whether each is estimated, units, time zone, Garmin connection), `get_training_status` (fitness, fatigue, form), `get_trends` with range `4w` (recent weekly volume) and `get_calendar` for the week (what is already planned or on the watch). To cite a recent session, pick one whose `find_activities` `capabilities` shows it can be analyzed (not `summary_only`).
2. Propose the week in plain words before building anything: each day's session, its purpose, and the week's volume against the last four. Keep hard days apart and easy days easy, and raise volume by no more than about 10% a week. Never stack missed sessions into catch-up days. Treat injuries the athlete mentions as hard limits.
3. Build only after the athlete agrees: one `build_workouts` call with up to seven sessions, each a plain-language description with its date. Where `get_athlete` shows a threshold as estimated or missing, put the target in the description ("at 4:35/km", "HR 150–160"). Use `edit_workout` to change one and `schedule_workouts` to move one or take it off the calendar.
4. Send to the watch only when the athlete asks or confirms: `send_to_garmin` with those workouts. Report each one as sent or not, with the weekday and date, and pass on any step the result says the athlete must take (connect Garmin, allow sending). Never say a workout is on the watch unless the result says it was sent.

Asking for advice never authorises saving or sending. If a call times out, check `get_calendar` before retrying so nothing is duplicated.

The athlete's explicit instructions come before these defaults (for example a different number of sessions, days or volume), except that nothing is sent to the watch without their OK. If what they ask looks risky, say so once, then follow their decision.
training-debrief2.72 KB

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---
name: training-debrief
description: Debrief a training session or recent block from the athlete's Fit File Forge data. Use when the user asks how a run, ride, swim or workout went, whether they hit their reps or targets, why heart rate was high, or how a session compares with similar ones.
---

To debrief a session:

1. Find it with `find_activities` (by date, sport or name) unless the user gave one. If more than one fits, ask which. Each hit's `capabilities` says what the session has: a `summary_only` one has only Garmin's summary, so there are no laps, zones, splits or series to read; say so and don't infer them.
2. Use the athlete's thresholds from `get_athlete` when zones or targets matter.
3. Match the depth to the question. A quick question ("did it go OK?", "what was my pace?") needs `get_activity` at depth `summary`. A full debrief reads `get_activity` with depth `full` (summary, laps, zones, best efforts) together with `get_activity_splits` (by `km` or `mi` for steady sessions, by `lap` for intervals).
4. For a full debrief, if the athlete allowed detailed data, `get_activity_series` for the channels the question needs (heart rate, pace or power, elevation) gives the detail for a chart of heart rate against pace or power and elevation. `columns_meta` and `coverage` say how each column was built and how complete it is; time-weight with `dt_s`, and use the pace columns rather than deriving pace from `speed_mps`. Compute from the data rather than estimating.
5. If a workout was planned that day (`get_calendar`), compare what was done with what was planned, rep by rep.
6. Add context only when load or fatigue is part of the question: `get_training_status`, or `compare_activities` against a similar recent session (its notes say when the two weren't a like-for-like effort).

Read `metrics_meta` and `dataNotes` before interpreting. `metrics_meta` gives moving and elapsed time and pace on one rule (moving pace for pacing, GAP or NGP for effort on hills) and marks numbers that don't apply to this session (`reliable: false` with a reason, such as efficiency on an interval session): leave those out and say why in one clause. `dataNotes` say, for example, that cadence is in steps per minute, or that Garmin sent only a summary.

Answer in this order: one sentence with the verdict, then the evidence with units (reps, splits, paces, heart rate, power), then one practical suggestion. Use the athlete's own thresholds and zones, never age-based formulas. Fit File Forge has no sleep, HRV or stress data. Pain or injury questions get a training-load answer and a pointer to a professional, never a diagnosis.

These steps are defaults. If the athlete asks for something different (shorter, a different focus or order, no chart), do what they ask.

Release notes

Initial release: session analysis (summaries, splits, cleaned time series), fitness and form, trends, race predictions and best efforts, the training calendar, and building, editing, scheduling and sending structured Garmin workouts.

Declared in the saved package. Remote tools may change independently.

Package details

Publisher declarations from the archived package. These are separate from our research and the live service's terms.

Package license
MIT
Package author
Forge Labs LLC
Keywords
See keywords
Declared availability
No country restrictions declaredDeclared regions; live availability may differ.
Commerce declaration
Does not support commerceThis does not establish whether access is free or paid.
Review scenarios
5 positive · 3 negativeScenario counts, not test results.

Declared capabilities

  • Analyze a training session in detail
  • Track fitness, fatigue and training load
  • Predict race times and best efforts
  • Show your training calendar
  • Build structured workouts from plain language
  • Send workouts to your Garmin watch when you ask

Package observed Nov 12, 2026.

Technical details
First seen
Oct 7, 2026 · 00:00 UTC
Last seen
Nov 12, 2026 · 18:00 UTC
Latest observed change
Oct 29, 2026 · 12:06 UTC
Collection status
Collected

plugin_asdk_app_6ac4370294108191bd78786b8081ccf6

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