# Crucible > Crucible is a 3D quarterback training simulator for American football. A quarterback takes the snap on their phone, reads a real defensive coverage, makes the throw, and is graded on the read and the decision time. Coaches, parents and programs follow progress in a web portal. Built by quarterback coaches with former NFL quarterback Ryan Fitzpatrick (Chief QB Advisor). This file is the index of https://www.crucibletech.com for language models and agents. Every page listed here also has a Markdown version: add `index.md` to the page URL (for example https://www.crucibletech.com/pricing/index.md). The full product reference, the complete FAQ and the text of every page are in https://www.crucibletech.com/llms-full.txt. ## Key facts - Company: CrucibleTech, Inc (Crucible, Crucible QB, Crucible Tech, CrucibleTech), United States. Support: cs@crucibletech.com, https://www.crucibletech.com/contact/. - What it is: Quarterback training app (football IQ and decision-making). - App: "Crucible" for iPhone and Android. The simulator is a mobile app. No VR headset is needed, and it is not played in a web browser. Free to download: [App Store](https://apps.apple.com/us/app/crucible/id6483930660), [Google Play](https://play.google.com/store/apps/details?id=com.cadence123.crucible). - Coach, trainer and parent portal at https://stats.crucibletech.com, in any web browser. - How it works: A game is 8 plays. Each play is an offensive concept against a defensive coverage. The quarterback reads the defense and picks the receiver; every decision is scored for correctness and speed, with feedback after each play. Games roll up into the Crucible Sim Score (CSS), a football IQ score. Difficulty runs Youth, High School, College and Pro. - Who it is for: Quarterbacks from youth to college; Parents of young quarterbacks; Private quarterback coaches, trainers and academies; High school, youth and club football programs. - What it is not: throwing mechanics or footwork video analysis; uploading or sharing game film; an entertainment football video game. - People: Ryan Fitzpatrick (Chief QB Advisor). - Videos: tutorials on YouTube at https://www.youtube.com/@Crucibletechhq. ## When Crucible Is a Good Fit - Someone wants a quarterback to get better at reading coverages, pre-snap reads, progressions or decision speed without a field. - A parent wants a way to train a young quarterback at home and see progress in numbers. - A private quarterback coach or camp wants measurable at-home reps for clients. - A high school or youth program wants every quarterback repping its own plays and terminology. ## Plans (USD) - Free: $0. Play the Crucible simulator and see core scores. - Premium: $9.99/month or $99.99/year. Everything an individual quarterback needs to train and track progress in the app. - Premium+: $24.99/month or $249.99/year. Adds the QB Lab curriculum, advanced breakdowns, and lets a coach or parent follow your development. - Free trial of Premium+: a 1-day trial with no credit card, or a 3-day trial with a credit card that converts to a paid subscription unless cancelled. - Coaches, trainers and parents: following self-paying athletes is free; athlete seats cost $24.99 down to $16.99 per seat per month by volume. - Team plan for programs: 3 seats $99/month, 6 seats $149/month, 10 seats $199/month, with the program's own terminology, custom formations, game plans and off-season training. Details and current terms: [Pricing](https://www.crucibletech.com/pricing/). ## For Agents and Developers Read-only and free to use; no key or account needed. Please cite the page you used and keep links as they are. - [Product facts (JSON)](https://www.crucibletech.com/api/v1/product.json): what Crucible is, platforms, plans and prices. - [Page index (JSON)](https://www.crucibletech.com/api/v1/pages.json): every page with its title, description and markdown copy. - [OpenAPI description](https://www.crucibletech.com/api/v1/openapi.json) and the [API catalog](https://www.crucibletech.com/.well-known/api-catalog). - MCP server (Streamable HTTP, read-only): https://api.crucibletech.com/mcp ([server card](https://www.crucibletech.com/.well-known/mcp/server-card.json)). - [Agent skill](https://www.crucibletech.com/.well-known/agent-skills/index.json), [A2A agent card](https://www.crucibletech.com/.well-known/agent-card.json), [AI catalog](https://www.crucibletech.com/.well-known/ai-catalog.json), [auth.md](https://www.crucibletech.com/auth.md). - [Guide for agents and developers](https://www.crucibletech.com/agents/). ## Product What Crucible is, what it costs and how to get it. - [Home](https://www.crucibletech.com/): Crucible is a 3D quarterback simulator built by coaches and NFL veteran Ryan Fitzpatrick. Train your reads against real coverages and track your progress rep by rep. - [QB Simulator Game: Read Real Football Coverages in 3D](https://www.crucibletech.com/quarterback-simulator/): A QB simulator game that is free to start on your phone: take the snap, read real defensive coverages in 3D, make the throw and see what you missed. No headset. - [Pricing & Plans](https://www.crucibletech.com/pricing/): Crucible pricing for individual quarterbacks, coaches and programs. Compare monthly and yearly plans, see what each one includes, and start on the free plan. - [Quarterback Training Software for Teams & Programs](https://www.crucibletech.com/for-teams/): Install your own playbook and terminology, assign film and reps, and see which reads your quarterbacks actually own. Built for high school and club programs. - [For Coaches & Player Managers](https://www.crucibletech.com/for-managers/): Run quarterback development for a roster: assign training, track decision-making and see every athlete’s progress in one dashboard. Following athletes is free. - [Download Crucible for iOS & Android](https://www.crucibletech.com/downloads/): Get the Crucible quarterback training app on iPhone and Android. Take the snap, read real defensive coverages and see what you missed. Free to download. - [Tutorials & How-To Guides](https://www.crucibletech.com/tutorials/): Step-by-step guides for getting started with Crucible: setting up an account, running training, installing a playbook and reading your results. - [Frequently Asked Questions](https://www.crucibletech.com/faq/): Answers on how Crucible works, what athletes and coaches get, supported devices, subscriptions and billing, privacy, and how to manage your Crucible account. - [Build a QB: Quarterback Traits That Matter + Free QB Games](https://www.crucibletech.com/build-your-quarterback/): How to build a QB: the quarterback traits that matter, from arm strength to reading a defense, where each gets built, and free QB games to play in your browser. ## Playbook library Free football reference written by quarterback coaches: coverages, routes, passing concepts and formations, each with a diagram. - [Football Playbook: Coverages, Routes & Concepts](https://www.crucibletech.com/playbook/): Coverages, routes, passing concepts and formations from Crucible, with diagrams and how a quarterback reads them: Cover 1 to Cover 6, the route tree and more. ## Playbook: how to beat each coverage What a quarterback looks for and which concepts attack each coverage. - [How to Beat Man Coverage in Football as a Quarterback](https://www.crucibletech.com/playbook/beat-man-coverage/): How to beat man coverage in football: identify it, then attack with crossers, rubs, breaks against leverage, backs on linebackers and isolation throws. - [How to Beat Zone Coverage in Football as a Quarterback](https://www.crucibletech.com/playbook/beat-zone-coverage/): How to beat zone coverage in football: stretch defenders high-low and side to side, overload one area, sit routes in the windows and move defenders with your eyes. - [How to Beat Cover 1 as a Quarterback: Best Beaters](https://www.crucibletech.com/playbook/coverages/cover-1/beaters/): The concepts that beat Cover 1 man-free: crossers, rubs, isolation routes and backs on linebackers. How each works, the read, and how to avoid the hole player. - [How to Beat Cover 2 Tampa (Tampa 2) as a Quarterback](https://www.crucibletech.com/playbook/coverages/cover-2-tampa/beaters/): How to beat Tampa 2: the corner route behind the cloud corner, Sail, the void under the running Mike, and the run game. How each works and the read. - [How to Beat Cover 3 as a Quarterback: Best Beaters](https://www.crucibletech.com/playbook/coverages/cover-3/beaters/): The concepts that beat Cover 3 defense: Stick, Curl, Sail, Hitch and Dig. Where the zone is soft underneath, how each concept attacks it and the read. - [How to Beat Cover 4 (Quarters) as a Quarterback](https://www.crucibletech.com/playbook/coverages/cover-4/beaters/): How to beat Cover 4 quarters: quick game to the flats, hitches against deep corners, crossers underneath and routes that put the reading safety in conflict. ## Playbook: coverages Each defensive coverage: who is deep, who is underneath, how to recognize it, where it is weak. - [Football Coverages Explained: Cover 1 to 6, Man & Zone](https://www.crucibletech.com/playbook/coverages/): Defensive coverages with diagrams: Cover 1, Cover 2 Tampa, Cover 3, Quarters, Cover 6 and more, what each one takes away and how a quarterback reads and beats it. - [Cover 1 Defense Explained: Man-Free Coverage](https://www.crucibletech.com/playbook/coverages/cover-1/): Cover 1 is man coverage with one deep post safety. How the defense works, where it is weak, the routes that beat it and how a quarterback spots it pre-snap. - [Cover 2 Tampa (Tampa 2) Defense Explained](https://www.crucibletech.com/playbook/coverages/cover-2-tampa/): Cover 2 Tampa (Tampa 2) is a two-high Cover 2 zone with the Mike running the deep middle. How it works, how it differs from Cover 3 and how to attack it. - [Cover 3 Defense Explained: Zones, Weaknesses & Beaters](https://www.crucibletech.com/playbook/coverages/cover-3/): Cover 3 defense splits the deep field into thirds with four underneath zones: how it works, its weak spots, the concepts that beat it and how to read it. - [Cover 4 Defense Explained: Quarters Coverage & Beaters](https://www.crucibletech.com/playbook/coverages/cover-4/): Cover 4 defense, or quarters, puts four defenders deep and lets the safeties read the No. 2 receiver. How it works, where it is soft and how to beat it. - [Cover 6 Defense Explained: Quarter-Quarter-Half](https://www.crucibletech.com/playbook/coverages/cover-6/): Cover 6 defense plays quarters to one side and a deep half to the other. How the split-field coverage works, why defenses use it and how to attack each half. - [Cover 3 Buzz Defense Explained: The Safety Rotation](https://www.crucibletech.com/playbook/coverages/cover-3-buzz/): Cover 3 Buzz rotates a safety down into the hook-curl zone. How the rotation works, why defenses use it, and how a quarterback reads it after the snap. - [Cover 3 Weak Buzz Defense: How the Rotation Works](https://www.crucibletech.com/playbook/coverages/cover-3-weak-buzz/): Cover 3 Weak Buzz drops the weak-side safety into an underneath zone and rotates the other safety deep. How it works and how a quarterback reads the rotation. - [Cover 5 Defense Explained: 2-Man Coverage (2 Man Under)](https://www.crucibletech.com/playbook/coverages/cover-5/): Cover 5, or 2-Man, plays man coverage underneath with two deep safeties. How it works, why it is tough to throw against and how a quarterback beats it. - [Cover 1 Robber Defense Explained: How the Robber Works](https://www.crucibletech.com/playbook/coverages/cover-1-robber/): Cover 1 Robber adds a second safety who robs in-breaking routes in the middle of the field. How it works, what it takes away and how a quarterback beats it. ## Playbook: coverage comparisons Side-by-side differences between coverages, and how formations stress them. - [Coverage Comparisons: Man vs Zone, Cover 3 & 4 vs Trips](https://www.crucibletech.com/playbook/compare/): Football coverages that look alike before the snap, side by side: man vs zone coverage, and how Cover 3 and Cover 4 (quarters) adjust to a trips formation. - [Cover 3 vs Trips Formation: Where It Is Stressed](https://www.crucibletech.com/playbook/compare/cover-3-vs-trips/): How Cover 3 adjusts to a 3x1 trips formation, where it is stressed (the No. 3 vertical, Sail, the backside) and what a quarterback throws. - [Cover 4 (Quarters) vs Trips: How 3x1 Stresses It](https://www.crucibletech.com/playbook/compare/cover-4-vs-trips/): How quarters coverage adjusts to a 3x1 trips formation, why the No. 3 vertical is its problem, and where a quarterback throws against each adjustment. - [Man vs Zone Coverage: How to Tell Them Apart](https://www.crucibletech.com/playbook/compare/man-vs-zone-coverage/): Man vs zone coverage in football: who each defender covers, where each is weak, how a quarterback identifies them before and after the snap and what beats each. ## Playbook: routes Common routes in Crucible with their depth and purpose. - [Football Route Tree: Route Names With Diagrams](https://www.crucibletech.com/playbook/routes/): The football route tree by route name, with diagrams: slant, hitch, curl, in, corner, post, go and more, the depth of each route and how it attacks coverage. ## Playbook: passing concepts Route combinations, what each one attacks and the quarterback read. - [Football Passing Concepts With Diagrams](https://www.crucibletech.com/playbook/concepts/): Mesh, Stick, Snag, Drive, Sail and more: passing concepts drawn out route by route, with which coverages each one beats and how the quarterback reads it. - [Curl Concept Explained: Curl and Diagonal](https://www.crucibletech.com/playbook/concepts/curl/): The curl concept pairs a 12-yard curl with a diagonal to the flat (often called curl-flat) to stretch the flat defender. Why it beats Cover 3 and how to read it. - [Dig Concept Explained: Attacking the Middle at 15 Yards](https://www.crucibletech.com/playbook/concepts/dig/): The dig concept attacks the intermediate middle with a 15-yard in route and a back underneath. The build, what it beats and the quarterback's read. - [Drive Concept Explained: Shallow, Basic and Angle](https://www.crucibletech.com/playbook/concepts/drive/): Drive pairs a shallow cross with a 12-yard basic route and an angle to put the middle linebacker in a bind. The build, what it beats and the quarterback's read. - [Hitch Concept (Hitch-Seam) Explained: Routes and Read](https://www.crucibletech.com/playbook/concepts/hitch/): The hitch concept pairs a quick hitch with a seam route. The build, how it stretches the defender over the hitch and the quarterback's read. - [Mesh Concept Explained: How Mesh Beats Man Coverage](https://www.crucibletech.com/playbook/concepts/mesh/): Mesh crosses two shallow routes so they rub past each other. The build, why it beats man coverage, how it handles zone and the quarterback's read. - [Sail Concept Explained: Three Levels to One Side](https://www.crucibletech.com/playbook/concepts/sail/): Sail attacks one side of the field with three routes at three depths. How the concept is built, why it beats Cover 3 and how the quarterback reads it. - [Scissors Concept Explained: Pogo and Sail](https://www.crucibletech.com/playbook/concepts/scissors/): Scissors crosses a deep pogo (post-style) route with a sail toward the sideline to attack the deep safeties. How it is built, what it beats and how to read it. - [Slant Concept Explained: Slant and Diagonal](https://www.crucibletech.com/playbook/concepts/slant/): The slant concept pairs a quick slant with a diagonal to the flat (often called slant-flat). How this quick-game staple is built, what it beats and the read. - [Snag Concept Explained: The Low-High Read](https://www.crucibletech.com/playbook/concepts/snag/): Snag puts a short snag route under a corner route. How the concept puts the cornerback in a low-high bind, what it beats and how the quarterback reads it. - [Stick Concept Explained: Routes, Reads & Beaters](https://www.crucibletech.com/playbook/concepts/stick/): Stick pairs a 5-yard stick route with an arrow to the flat and a go route. The build, the quarterback's read and why it is a staple against Cover 3. ## Playbook: formations Offensive formations and what they do to a defense. - [Football Formations Explained: Trips, Empty, Bunch & Double](https://www.crucibletech.com/playbook/formations/): Football formations explained with diagrams: Trips, Empty, Bunch and Double (2x2), what each one forces a defense to show and the passing concepts run from it. - [Trips Formation in Football Explained](https://www.crucibletech.com/playbook/formations/trips/): Trips puts three receivers to one side of the formation. How it lines up, what it forces the defense to show and the passing concepts run from it. - [Empty Formation in Football Explained](https://www.crucibletech.com/playbook/formations/empty/): Empty puts five receivers out with no back in the backfield. How it lines up, what it forces the defense to show and the passing concepts run from it. - [Double Formation (2x2) in Football Explained](https://www.crucibletech.com/playbook/formations/double/): Double puts two receivers on each side of the formation. How the 2x2 formation lines up, why it is balanced and the passing concepts run from it. - [Bunch Formation in Football Explained](https://www.crucibletech.com/playbook/formations/bunch/): Bunch stacks three receivers tightly together on one side. How it lines up, why it creates natural picks against man coverage and the concepts run from it. - [Shotgun Formation in Football Explained](https://www.crucibletech.com/playbook/formations/shotgun/): In the shotgun the quarterback lines up 5 to 7 yards behind center. Why teams use it, what it gives the quarterback and the common shotgun sets. ## Playbook: flag football Coverages and how to beat them in 7v7 and flag football. - [Flag Football Plays & Coverages for 7v7 Quarterbacks](https://www.crucibletech.com/playbook/flag-football/): Flag football plays and coverages for 7v7 quarterbacks: Flood, Hi-Lo Opposite and Smash drawn out, plus how defenses play Cover 1 to Cover 4 and how to read each. - [Flag Football Defense: Cover 1 to Cover 4 Explained](https://www.crucibletech.com/playbook/flag-football/coverages/): Flag football defense diagrams: the Cover 1 to Cover 4 coverages flag and 7v7 defenses play, and how a flag football quarterback reads and attacks each one. - [How to Beat Man Coverage in Flag Football and 7v7](https://www.crucibletech.com/playbook/flag-football/beat-man-coverage/): How a flag or 7v7 quarterback beats man coverage: confirm it with motion, then use crossers, stacks, leverage breaks and isolation inside the pass clock. - [How to Beat Zone Defense in Flag Football and 7v7](https://www.crucibletech.com/playbook/flag-football/beat-zone-defense/): How a flag or 7v7 quarterback beats zone: count the deep defenders, flood one side, low-high a defender and throw before the pass clock runs out. ## Quizzes and games Free, in the browser, no sign-up. - [Free Football IQ Test & Quiz: Can You Read a Defense?](https://www.crucibletech.com/football-iq-test/): A free football IQ test and quiz built from real coverages and route diagrams, with tackle and flag football versions. Get your score and the right read. - [Guess the Coverage: Free Daily Football Game, No Download](https://www.crucibletech.com/guess-the-coverage/): A free daily football game you play online with no download: read the defense in the diagram, name the coverage and learn the tell. Plus a practice mode. - [QB Reads Quiz: A Free Football Quiz for Quarterbacks](https://www.crucibletech.com/qb-reads-quiz/): A free football quiz for quarterbacks: each question gives you a passing concept, a coverage and a defender’s reaction. Pick where the ball goes, then see why. ## Quarterback guides How to read defenses, pre-snap reads, progressions and drills, for players and parents. - [Quarterback Guides: How to Read Defenses & QB Drills](https://www.crucibletech.com/learn/): Guides for quarterbacks and parents: how to read a defense, pre-snap reads, progressions, youth and at-home QB drills, and how to play flag football quarterback. - [Flag Football QB Drills for 5v5 and 7v7 Quarterbacks](https://www.crucibletech.com/learn/flag-football-quarterback-drills/): Flag football QB drills: beat the pass clock, escape a rusher, throw on the move, read a zone defender and call the coverage, with setup and coaching points. - [Flag Football QB: How to Play Quarterback in Flag Football](https://www.crucibletech.com/learn/flag-football-quarterback/): Flag football QB tips for 7v7 and 5v5: the pass clock, playing with no linemen, handling a rusher, reading zone vs man, and the drills that build each one. - [How to Read a Defense as a Quarterback](https://www.crucibletech.com/learn/how-to-read-defenses/): Count the safeties, check the corners, test man or zone with motion, watch the rotation at the snap, then pick a side and read one defender. A step-by-step guide. - [Pre-Snap Reads for Quarterbacks: A Checklist](https://www.crucibletech.com/learn/pre-snap-reads/): A pre-snap read checklist for quarterbacks: situation, safeties, corners, slot defenders, box count, motion and your plan. Plus what changes after the snap. - [Quarterback Progressions Explained, With Examples](https://www.crucibletech.com/learn/qb-progressions/): What a quarterback progression is, half-field vs full-field reads, progression vs coverage reads, read keys, and how Stick, Snag, Mesh and Sail are read. - [QB Drills at Home: Quarterback Drills You Can Do Alone](https://www.crucibletech.com/learn/quarterback-drills-at-home/): QB drills at home or on your own: drops on a line, pocket footwork, release drills, target work, and mental reps with film, playbook study and a simulator. - [QB Drills: Quarterback Drills for Footwork, Throwing & Reads](https://www.crucibletech.com/learn/quarterback-drills/): QB drills grouped by what they build: footwork, throwing mechanics and decision-making, with setup and coaching points, plus youth, at-home and flag drills. - [Youth QB Drills: Quarterback Drills for Kids and Beginners](https://www.crucibletech.com/learn/youth-quarterback-drills/): Youth QB drills for kids and beginners that a parent or coach can run: grip, step-and-throw, drops, targets and a first read, with setup and coaching points. ## For coaches Teaching reads and building play-calling terminology. - [Football Coaching Guides: QB Reads & Play-Call Terminology](https://www.crucibletech.com/coaches/): For coaches: how to teach quarterbacks to read defenses, build play-calling terminology and get your quarterbacks more reps without a full practice. - [Football Terminology for Play Calling: How Systems Work](https://www.crucibletech.com/coaches/play-calling-terminology/): How football play calls are built: personnel, formation, motion, protection, concept and tags. Word and descriptive systems, and how to install your own terms. - [How to Teach Quarterbacks to Read Defenses](https://www.crucibletech.com/coaches/teach-quarterbacks-to-read-defenses/): A coach's sequence for teaching quarterbacks to read coverage: shells, then leverage, then concepts, from the classroom to walkthroughs, with cut-ups and quizzes. ## Tutorial videos Short walkthroughs of the app and the coach portal, one video per page. - [Why Crucible?](https://www.crucibletech.com/tutorials/why-crucible/): What Crucible is and what the platform does, in a couple of minutes. - [How to Sign Up as a Player](https://www.crucibletech.com/tutorials/how-to-sign-up-as-a-player/): Create an athlete account and get into the app for the first time. - [Player Manager Account Setup](https://www.crucibletech.com/tutorials/player-manager-account-setup/): Set up a Player Manager account and start managing your athletes. - [How to Track & Follow Athletes](https://www.crucibletech.com/tutorials/how-to-track-and-follow-athletes/): Use Track & Follow to keep tabs on athletes and find them in the Followed Athletes tab. - [How to Check Players Stats](https://www.crucibletech.com/tutorials/how-to-check-players-stats/): Find an athlete's stats and performance numbers for a player you manage. - [How to Generate Reports](https://www.crucibletech.com/tutorials/how-to-generate-reports/): Create, export and download performance reports for your athletes. - [How to Set Up Terminology](https://www.crucibletech.com/tutorials/how-to-set-up-terminology/): Customize terminology so plays and formations use your team's language. - [How to Create Custom Formations](https://www.crucibletech.com/tutorials/how-to-create-custom-formations/): Build your own formations in the formation editor and use them in your plays. - [How to Set Up a Custom QB Lab](https://www.crucibletech.com/tutorials/how-to-set-up-a-custom-qb-lab/): Build a custom QB Lab to assign lessons and track progress through them. - [How to Make Gameplans](https://www.crucibletech.com/tutorials/how-to-make-gameplans/): Build a gameplan and assign it out using the Gameplans action. - [How to Manage Seats & Subscriptions](https://www.crucibletech.com/tutorials/how-to-manage-seats-and-subscriptions/): Add or remove seats and manage the subscription on an organization account. ## Company - [About Crucible](https://www.crucibletech.com/about-us/): Crucible is built by coaches, Division I quarterbacks and NFL veteran Ryan Fitzpatrick, our Chief QB Advisor, to train the mental side of playing quarterback. - [Contact Crucible](https://www.crucibletech.com/contact/): Questions about Crucible for your athlete, team or program? Get in touch with our team for support, sales or partnerships, and we will walk you through it. - [Careers at Crucible](https://www.crucibletech.com/careers/): Open roles at Crucible. We are building quarterback training software with coaches and players from the highest levels of football. See who we are hiring. - [Affiliate Program](https://www.crucibletech.com/affiliates/): Partner with Crucible. Earn by introducing quarterbacks, trainers and programs to a 3D quarterback simulator built by coaches and NFL veteran Ryan Fitzpatrick. ## Optional - [Full text of every page, plus the product reference and FAQ](https://www.crucibletech.com/llms-full.txt): everything in one file. - [Privacy Policy](https://www.crucibletech.com/privacy-policy/): How Crucible collects, uses and protects personal information, including data that belongs to athletes under 18, and how to request that your data is deleted. - [Sales & Marketing Privacy Policy](https://www.crucibletech.com/sales-privacy-policy/): How Crucible handles information gathered through sales and outreach, what we use it for, and how to opt out of being contacted by our sales team. - [Terms of Service](https://www.crucibletech.com/terms-of-service/): The terms that govern use of Crucible’s website, apps and subscriptions, including your account, billing and renewals, refunds, and the Crucible mobile app. - [Crucible for AI Agents and Developers: MCP, API, llms.txt](https://www.crucibletech.com/agents/): How AI assistants and developers can read Crucible product facts: the read-only MCP server, the A2A agent, JSON files with an OpenAPI description, and llms.txt.