Using Strava's Claude Connector Alongside IcuSync

What we learned using both with two 10×400m sessions

Strava recently launched its own MCP connector, currently in beta, giving Claude access to your Strava data directly in conversation. If you're already an IcuSync subscriber, you might be wondering how the two fit together.

The short answer: they do different jobs, and they work well side by side. Let's walk through it with real data.

What was tested

Two sessions: a 10×400m interval session run on June 2 and again on June 9, 2026. Same route, same structure, same athlete. The goal was to push every available tool in both connectors and see what each one is best at.

What Strava's connector does well

Strava MCP gave Claude access to five tools: list activities, get activity performance, get activity streams, get athlete zones, and get athlete profile.

The streams tool is the standout, and it's a great fit for plotting a session. For the June 9 session it returned 100-point resolution time-series data for power, heart rate, pace, cadence, altitude, and grade, enough to plot the full session and see exactly where each interval landed. The lap data from get_activity_performance provided rep-by-rep power, HR, time, and grade for all 10 reps across both sessions, making a direct week-on-week comparison possible.

That comparison told a clear story. On June 2, average HR through the rep set was running 10-15 bpm higher despite nearly identical power output. Max HR hit 179. On June 9 it peaked at 168. Same route, same paces, meaningfully lower physiological cost. A genuine signal of fitness adaptation that the data made visible.

IcuSync doesn't expose raw time-series streams, because a single stream can run to thousands of data points. It sticks to per-interval aggregates instead, so the two connectors complement each other here.

Strava MCP is good at answering the question: what happened in this session?

What IcuSync is for

IcuSync works from your Intervals.icu account, so it covers your planning, fitness tracking and wellness.

Interval breakdown with aerobic decoupling. IcuSync's get_activity_detail returns per-interval pace, power, HR, and distance, plus aerobic decoupling (Pw:HR drift) and efficiency factor for the whole session. For Stryd users, get_extended_metrics adds a second layer: ground contact time, vertical oscillation, leg spring stiffness, form power, impact loading rate, and W' balance per interval.

Best efforts across all activities. IcuSync's get_best_efforts pulls your fastest times and best power outputs across every activity in Intervals.icu, not just the one you're looking at. Current 12-month bests: 400m in 1:16, 5km in 19:37, marathon in 2:58:15.

Fitness, fatigue, and form. IcuSync has a get_fitness tool that returns CTL (chronic training load / fitness), ATL (acute training load / fatigue), and TSB (training stress balance / form) across any date range. On June 9, CTL was 65.3 and fitness has been building steadily since early May. TSB was -5, meaning slightly fatigued but well within a productive training range.

Training zone distribution. Over the past nine days of running, IcuSync showed 42% of time in Z2 power, 31% in Z3, and 7% in Z4, confirming the training structure is holding its polarised shape even through a speed phase.

Power curve. The 90-day run power curve shows a critical power of 330W, 5-minute best of 361W, and estimated VO2max of 60.5. These are the benchmarks that tell you whether training is working at a physiological level.

Wellness data. IcuSync surfaces HRV, resting HR, sleep, and subjective scores (fatigue, soreness, mood, motivation) from Intervals.icu. Understanding why Tuesday felt harder than last Tuesday requires more than activity data. It requires knowing what happened the night before.

The write direction. This is the one that matters most for the core use case. IcuSync can push structured workouts directly to your Intervals.icu calendar, which then syncs to your Garmin, Coros, Wahoo, or Suunto. Claude can build a session, review it with you in conversation, and send it to your device, all without leaving the chat.

What each connector actually costs

Strava MCP requires a Strava Premium subscription. IcuSync requires both an Intervals.icu account (free) and an IcuSync subscription. If you're already paying for Strava Premium, the Strava connector costs you nothing extra to try.

Strava's connector is great for looking closely at a completed activity, including raw streams. IcuSync handles fitness tracking, training planning, wellness and pushing structured sessions to your device.

Getting both connectors working together

There is one catch worth knowing about before you connect both tools.

Many Intervals.icu users sync their activities via Strava. Those activities appear in the Intervals.icu web app, but they aren't available through the Intervals.icu API that IcuSync uses. So Claude can see them through Strava's connector, but not through IcuSync.

The fix is straightforward and does not cost you your existing Strava history. Go to Intervals.icu Settings, open Connections, and uncheck "Download activities" under Strava. Then connect your device directly to Intervals.icu. Garmin, Wahoo, Coros, Suunto, and Polar all support native sync. From that point forward, new activities sync natively and are fully accessible to both IcuSync and Claude. Your existing Strava activity history stays intact in Strava, and Strava MCP can still read it.

If you use TrainerRoad, enable Dropbox sync in TrainerRoad settings and connect Dropbox in Intervals.icu under Settings.

Once you have native device sync set up, both connectors work together without any conflict. Strava MCP handles the read-only Strava-side view: raw streams, segment efforts, social data. IcuSync handles the coaching layer: fitness tracking, planning, wellness, and pushing workouts to your device. Neither gets in the way of the other.

Using both

If you want to ask Claude about a specific session, such as how your HR compared or how power changed over time, Strava's connector is a capable tool and worth connecting.

If you want Claude to help plan your training and push a structured workout to your watch, that's what IcuSync is for.

Used together, they give Claude a fuller view of your training: what happened today, how it fits into the last 90 days, and what to do next.