About Domain Experts
Open source library of job role definitions — the actual mental models, decision thresholds, and failure modes of real practitioners, structured so any AI agent can load one and reason like that expert. Ask your agent to "review this contract" and it answers with a senior contracts attorney's clause playbook and fallback ladders, not a generalist's summary of the internet.
npx domain-experts match "review this vendor contract like a lawyer"
npx domain-experts add lawyer-contracts # installs into ./.claude/skills/"Act as a contracts lawyer" → generic checklist, no thresholds, no fallback order, different answer every run.
Loads lawyer-contracts → indemnity cap red-flag at <1x fees, liability fallback ladder (mutual cap → carve-outs → walk), same reasoning every time.
Why not just prompt "act as a CFO"?
You'll get the average of every job description on the internet, regenerated from scratch each session, verified by no one. These roles pass a non-derivability test — numeric red-flag thresholds, worked examples with reconciling numbers, fallback positions in preference order — built through an adversarial-critique pipeline and CI-linted on every PR.
How it's structured
Each role is a compact reasoning core (SKILL.md) plus on-demand depth (references/: artifacts, red flags, vocabulary). Works in Claude Code, Codex, Cursor, and 30+ agent tools that read the SKILL.md format.
How we verify
Not just "written by experts" — evals/run_evals.py measures counterfactual wins (skill vs. generalist baseline) and parity against real practitioners' public answers, reproducible by anyone.
Full pipeline, evidence, and per-tool install instructions: README on GitHub.
Browse roles
Accountant Controller
Use when a task needs the judgment of an accountant/financial controller — closing the books on a fixed calendar, resolving a bank or account reconciliation variance, evaluating a revenue-recognition or substance-over-form question, designing or testing an internal control, or triaging a discrepancy in financial records before it reaches the auditors.
Acoustical Engineer
Use when a task needs the judgment of an Acoustical Engineer — calculating room reverberation time (RT60) and specifying absorption/reflection treatment for a space, evaluating a wall or floor assembly's STC/IIC rating against a code or design target, diagnosing why a completed space fails its acoustic design intent, specifying industrial or mechanical equipment noise controls against OSHA/NIOSH exposure limits, or writing an acoustic design report or noise-control specification for a construction or renovation project.
Actor
Use when a task needs the judgment of a professional Actor — breaking down sides for a self-tape audition, preparing a character choice for rehearsal, deciding between two conflicting bookings, reading a contract offer for scale vs. scale-plus terms, or diagnosing why callbacks aren't converting to bookings.
Actuary
Use when a task needs the judgment of an Actuary — estimating unpaid claim reserves with chain-ladder or Bornhuetter-Ferguson methods, building or reviewing a rate indication from loss experience, applying credibility weighting to thin or volatile data, drafting a statement of actuarial opinion, or diagnosing whether a reserve or pricing assumption has stopped matching reality.
Acupuncturist
Use when a task needs the judgment of a licensed acupuncturist — building a TCM pattern-differentiation-based treatment plan, choosing point combinations and needling technique for a presenting complaint, triaging a safety red flag (fainting, suspected pneumothorax, herb-drug interaction), or writing a SOAP note that justifies medical necessity for insurance. US scope-of-practice default (NCCAOM/state licensure). A reasoning aid, not medical advice.
Acute Care Nurse
Use when a task needs the judgment of an Acute Care Nurse — tracking early warning score trends across a higher patient ratio than ICU to catch silent deterioration before crisis, distinguishing expected post-operative recovery variation from a true complication requiring escalation, triaging competing needs across multiple simultaneous patients, balancing analgesia against oversedation risk by real-time response rather than fixed dosing, and verifying genuine discharge readiness rather than checking a form.
Adapted Physical Education Specialist
Use when a task needs the judgment of an Adapted Physical Education Specialist — writing a legally-defensible PE present level and annual goal from motor/fitness assessment data, choosing the right test battery and alternate items for a student's mobility profile, recommending a placement step on the PE least-restrictive-environment continuum, or distinguishing a motor/balance deficit from a behavioral avoidance pattern.
Adhesive Bonding Machine Operator
Use when a task needs the judgment of an Adhesive Bonding Machine Operator — distinguishing an open-time violation from a pot-life check, controlling bond line thickness with calibrated spacers rather than clamping pressure alone, verifying surface prep with a test rather than visual cleanliness, or confirming actual part temperature reached full cure rather than trusting chamber setpoint and elapsed time.
Administrative Law Judge
Use when a task needs the judgment of an Administrative Law Judge, Adjudicator, or Hearing Officer — applying a mandatory sequential/structured evaluation framework in required order, weighing conflicting medical or vocational opinion evidence using specific regulatory factors, writing findings that explicitly address significant contrary evidence in the record, drafting a credibility/consistency finding tied to specific record citations, or checking whether a draft decision would survive substantial-evidence review.
Administrative Services Manager
Use when a task needs the judgment of an Administrative Services Manager — evaluating a vendor contract on total cost of ownership rather than price, right-sizing a facilities/admin budget against actual utilization, anticipating where an operational process breaks at the org's next size milestone, or diagnosing why internal operational support is failing a growing organization.
Adult Esl Instructor
Use when a task needs the judgment of an Adult ESL/Basic Education Instructor — placing a new adult learner using standardized assessment scores, designing life-context-relevant lesson content for working adults, tracking NRS-reportable level gains, addressing attendance/retention barriers, or preparing a learner for GED/HSE or workplace English benchmarks.
Advertising Promotions Manager
Use when a task needs the judgment of an Advertising and Promotions Manager — building a media plan backward from an objective and budget, briefing or evaluating creative against a brief, negotiating with agencies/media vendors, sanity-checking vendor-reported attribution, or reading a post-campaign debrief to separate delivery performance from response performance.
Advertising Sales Agent
Use when a task needs the judgment of an Advertising Sales Agent — pricing an ad-inventory package against a client budget, building a media-kit pitch, protecting yield on scarce inventory while moving remnant, or forecasting close rate on a sales pipeline. Sell-side: this role sells a publisher's or station's own ad space/time to advertisers, the opposite side of the table from a buyer-side advertising-promotions-manager who purchases media on a client's behalf.
Aerospace Engineer
Use when a task needs the judgment of an Aerospace Engineer — reconciling a vehicle mass/weight budget against a certification limit, computing a structural margin of safety, choosing a means of compliance for an FAA certification basis, tracing a weight-growth overrun back to a design decision, or evaluating a propulsion/aerodynamics tradeoff against a range or payload requirement.
Aerospace Engineering Technician
Use when a task needs the judgment of an Aerospace Engineering and Operations Technologist/Technician — verifying an installed fastener's preload against a drawing's torque callout via the T=K·D·F relationship, reducing strain-gauge data from a structural proof-load test into stress and checking it against an FEA-predicted margin, selecting and executing an NDI method against a defect type and material, reducing a wind-tunnel test point's dynamic-pressure and Reynolds-number data, or ballooning and dispositioning an AS9102 first article inspection. Distinct from an aerospace-engineer (owns the design, structural analysis, and certification basis) — this role builds, instruments, tests, and inspects the hardware the engineer specified, closing the loop with measurement rather than deriving a new analysis.
Agricultural Engineer
Use when a task needs the judgment of an agricultural engineer — sizing a center-pivot or drip irrigation system's peak capacity against crop water demand, computing lateral grain-bin wall pressure with Janssen's equation, sizing a waterway or tile-drainage system with Manning's equation and an NRCS design-storm return period, or building a manure/nutrient first-year availability mass balance against a crop's N requirement.
Agricultural Equipment Operator
Use when a task needs the judgment of an Agricultural Equipment Operator — calibrating planter seed population and singulation, diagnosing combine header or separator loss, sequencing planting or harvest across fields under a weather-constrained window, sizing machinery capacity in acres/hour against a season's acreage, or evaluating PTO/grain-bin entrapment safety on a job site.
Agricultural Grader Sorter
Use when a task needs the judgment of an Agricultural Grader/Sorter — calling a defect grade on a moving packing line, deciding whether a lot with a marginal QC sample gets accepted, hand re-sorted, downgraded, or held, choosing where to station a human grader relative to an optical sorter, or diagnosing why a lot's cull rate or customer chargebacks spiked.
Agricultural Inspector
Use when a task needs the judgment of an Agricultural Inspector — grading a lot of produce against a USDA grade standard's defect tolerances, evaluating agricultural water test results against FSMA microbial thresholds, checking a pesticide residue result against the commodity-specific EPA tolerance, deciding whether a finding warrants a stop-sale order versus a corrective-action letter, or verifying a facility's traceability records against a recall deadline.
Agricultural Manager
Use when a task needs the judgment of a Farmer, Rancher, or other Agricultural Manager — deciding a planting/breeding mix or acreage shift under price and weather uncertainty, sizing a hedge or crop-insurance coverage level, running break-even and diversification scenarios before a capital or input commitment, or evaluating land/herd management practices against long-term productive capacity.
Agricultural Sciences Professor
Use when a task needs the judgment of a tenure-track or tenured Agricultural Sciences faculty member at a land-grant university — deciding whether to submit a grant this cycle versus wait, allocating time across the teaching/research/extension appointment split, diagnosing a stalled graduate student or field trial, or drafting a tenure-and-promotion dossier narrative.
Agricultural Technician
Use when a task needs the judgment of an Agricultural Technician — designing a soil, tissue, or seed sampling plan, interpreting pest scouting counts against an economic threshold, calibrating spray/seeding equipment, or troubleshooting a field data discrepancy before it reaches the agronomist or scientist who acts on it.
Air Traffic Controller
Use when a task needs the judgment of an air traffic controller — sequencing and spacing arrivals/departures, resolving a projected loss of separation, applying wake-turbulence separation between mismatched aircraft categories, deciding when to query a read-back, or working a facility through a saturation/traffic-management event.
Aircraft Cargo Supervisor
Use when a task needs the judgment of an Aircraft Cargo Handling Supervisor — verifying a built ULD against its type's certified max gross weight before it's spotted for loading, running a hazmat item through the segregation table against its actual compartment neighbors, reconciling an actual cargo build against the dispatcher's load plan and deciding whether it clears a last-minute-change threshold or needs a reissued loadsheet, calling a ULD's lock/net restraint good or rejecting it, or running ramp FOD and ground-equipment clearance discipline around an aircraft during turn.
Aircraft Mechanic
Use when a task needs the judgment of a certificated aircraft mechanic — triaging a maintenance discrepancy, deciding whether an item can be MEL-deferred or grounds the aircraft, working out an Airworthiness Directive's compliance deadline, reviewing a torque/safety-wire job before sign-off, or writing a return-to-service log entry.
Aircraft Service Attendant
Use when a task needs the judgment of an aircraft service attendant — servicing an aircraft's potable water or lavatory/waste system without cross-connecting the two, sequencing turnaround tasks inside a fixed gate-time window, staging ground support equipment around an active aircraft, or timing servicing against a deicing/anti-icing holdover-time window before pushback.
Aircraft Structure Assembler
Use when a task needs the judgment of an Aircraft Structure, Surfaces, Rigging, and Systems Assembler — deciding whether an out-of-tolerance hole or fastener needs a nonconformance report versus a field fix, verifying torque and calibration status before a fastener installation, diagnosing a FOD (foreign object debris) risk before closing a structure, or reading a drawing callout against a conflicting work instruction.
Airfield Operations Specialist
Use when a task needs the judgment of an airfield operations specialist — running a Part 139 self-inspection of the movement area, assigning a Runway Condition Code (RwyCC) after snow/ice contamination, deciding whether a discovered hazard needs an immediate NOTAM, triggering a Wildlife Hazard Assessment after a strike or sighting, or judging a FOD find as immediate-closure versus scheduled removal.
Airline Pilot
Use when a task needs the judgment of an airline pilot — checking whether an ETOPS diversion-time rating still holds against a current MEL downgrade, deciding whether to accept or query a dispatch release, applying sterile-cockpit discipline and Pilot Flying/Pilot Monitoring role separation on a two-pilot flight deck, resolving a captain-dispatcher operational-control disagreement, or checking Part 117 flight-duty-period legality against an irregular-operations delay.
Allergist Immunologist
Use when a task needs the judgment of an allergist/immunologist — interpreting a skin-prick or specific-IgE result against pretest probability, working up a "penicillin allergy" label for delabeling before a needed antibiotic, managing anaphylaxis and biphasic-reaction risk, stepping asthma therapy up or down, or evaluating suspected primary immunodeficiency.
Ambulance Driver Attendant
Use when a task needs the judgment of an ambulance driver/attendant (non-EMT) — deciding emergency-vehicle driving mode, clearing an intersection under lights-and-siren, handling a scheduled inter-facility or discharge transport, securing and lifting a patient on a stretcher/gurney, or responding to time pressure from family or a sending facility to "run it hot.
Amusement Recreation Attendant
Use when a task needs the judgment of an Amusement and Recreation Attendant — running ride dispatch and restraint checks, calling a weather or mechanical hold, managing queue throughput and wait-time complaints, operating a game booth or coin-operated attraction, or handling an on-ride evacuation.
Anesthesiologist
Use when a task needs the judgment of a board-certified anesthesiologist — building a preoperative anesthesia plan and risk stratification, choosing general vs. regional technique and airway strategy, managing an intraoperative crisis (difficult airway, malignant hyperthermia, local anesthetic systemic toxicity), or writing a PACU handoff and postoperative pain-management order set.
Anesthesiologist Assistant
Use when a task needs the judgment of a Certified Anesthesiologist Assistant (CAA) working inside an Anesthesia Care Team — building and executing an intraoperative anesthetic plan under a directing anesthesiologist, reading a vital-sign trend for anesthesia-specific emergencies (malignant hyperthermia, local anesthetic systemic toxicity, awareness), deciding when a deviation is an immediate-escalation trigger versus an independently correctable event, or navigating the jurisdiction/concurrency limits of CAA practice.
Animal Breeder
Use when a task needs the judgment of a livestock geneticist/animal breeder — selecting a sire against EPDs or genomic data, screening a proposed mating for inbreeding risk, deciding AI versus natural service, timing an estrus-synchronization protocol, or defending a breeding-goal tradeoff to a herd owner.
Animal Caretaker
Use when a task needs the judgment of an Animal Caretaker — triaging daily husbandry when kennel census exceeds staffing capacity, reading a Fear-Anxiety-Stress (FAS) score change or appetite/output drop against an escalation threshold, deciding brush-out vs. shave-down on a matted coat, or setting isolation and vaccination-lead-time protocol for a new intake or boarding admission.
Animal Control Worker
Use when a task needs the judgment of an Animal Control Worker — responding to a dog-bite or animal-attack call, determining rabies-exposure quarantine protocol, evaluating a dangerous-dog classification referral, planning a cruelty/neglect investigation and removal, or selecting a capture/restraint method for a stray or wildlife-in-structure call.
Animal Scientist
Use when a task needs the judgment of an Animal Scientist — formulating a least-cost livestock ration against nutrient requirements, evaluating breeding stock using EPDs or a selection index, diagnosing a feed-conversion-ratio decline, or designing a growth/reproduction performance-monitoring plan for a livestock operation.
Animal Trainer
Use when a task needs the judgment of an animal trainer — designing a behavior-modification plan for a specific problem behavior, choosing a reinforcement schedule and deciding when to raise criteria, structuring session length and frequency to avoid fatigue or frustration plateaus, or setting a handler/public safety protocol around a training animal.
Animator
Use when a task needs the judgment of a Character/Motion Animator — triaging which shots in a batch get full 12-principles polish versus blocking-only under a tight schedule, choosing pose-to-pose vs. straight-ahead for a shot, writing a rig-limitation workaround memo, or reading a director's revision note as a pose fix vs. a timing fix.
Anthropologist Archeologist
Use when a task needs the judgment of an Anthropologist/Archeologist working in cultural resource management (CRM) — scoping a Section 106 Phase I identification survey, designing a shovel-test-pit sampling strategy, evaluating National Register of Historic Places eligibility under Criteria A-D, interpreting excavation stratigraphy via a Harris matrix and radiocarbon results, or running the ethnographic field-methods branch (participant observation, informant interviewing) for a cultural-anthropology component of a project.
Anthropology Archaeology Professor
Use when a task needs the judgment of a postsecondary Anthropology or Archaeology professor — designing a gen-ed or major-track course, building a tenure or promotion dossier, defending a department against an enrollment-driven program review, mentoring a graduate student's fieldwork grant application, or writing an IRB/NAGPRA-compliant fieldwork plan.
Application Security Engineer
Use when a task needs the judgment of an Application Security Engineer — checking whether an endpoint verifies object-level authorization (not just authentication), running threat modeling at design time rather than deferring security review to the end, triaging a dependency vulnerability by actual reachability rather than CVSS score alone, combining SAST/DAST/SCA tooling to cover their distinct blind spots, or applying context-specific output encoding to untrusted input. Distinct from an information security analyst — this role works inside the SDLC to prevent vulnerabilities before they ship, not detect and respond to intrusions in production.
Architect
Use when a task needs the judgment of a licensed Architect — programming a building's spatial/functional requirements against a budget, developing a design concept against a zoning/code envelope, evaluating a fee proposal or scope-creep request, resolving a code-compliance conflict between disciplines, or working through a construction-phase change order's cost and schedule impact.
Architectural Civil Drafter
Use when a task needs the judgment of an Architectural and Civil Drafter — setting up a CAD sheet at the correct scale and viewport scale factor, applying NCS/AIA layer and sheet-numbering standards, dimensioning a wall assembly or site plan per governing convention, managing xrefs and revision clouds across a sheet set, or QC-checking a drawing set before issuance.
Architectural Engineering Manager
Use when a task needs the judgment of an Architecture/Engineering firm or department manager — pricing a project fee (lump sum vs. hourly vs. % of construction cost), staffing a project against backlog, evaluating scope creep on a fixed-fee job, managing professional liability exposure, or deciding whether to pursue a project given current utilization.
Architecture Teacher Postsecondary
Use when a task needs the judgment of an Architecture Teacher, Postsecondary — running studio desk crits and final jury reviews, grading design work on process and constraint-response rather than rendering polish, separating a personal design-style opinion from an objective functional or code flaw during critique, and checking whether a studio brief's precedent set is stale relative to current construction and code practice.
Archivist
Use when a task needs the judgment of an archivist — appraising whether a donated or transferred collection has enduring value, deciding a processing level for a backlog, writing a finding aid, triaging preservation under budget constraints, or resolving a records-restriction question.
Area Ethnic Cultural Studies Professor
Use when a task needs the judgment of an Area, Ethnic, or Cultural Studies Professor — designing a joint-appointment course load across two departments, prepping a tenure or mid-tenure review file for interdisciplinary scholarship, deciding whether a course survives an enrollment or political-pressure threat, evaluating community-engaged research for a merit case, or writing a Title VI/FLAS-adjacent grant narrative.
Art Director
Use when a task needs the judgment of an Art Director — commissioning and choosing between divergent creative concepts for a campaign, triaging client feedback into concept vs. execution notes, pressure-testing a concept against a production budget/timeline before it's locked in, or managing a shoot/production budget across a multi-deliverable campaign.
Art Drama Music Professor Postsecondary
Use when a task needs the judgment of a Postsecondary Art, Drama, or Music Professor — diagnosing a jury/crit score that contradicts a semester of formative work, building a studio-art or performance tenure dossier around exhibitions and productions instead of publications, staffing applied one-on-one lessons or crit sections between adjuncts and full-time faculty, running a structured critique, or deciding whether a failed barrier jury means a change of major.
Art Therapist
Use when a task needs the judgment of an Art Therapist — matching art media to a client's regulation capacity via the Expressive Therapies Continuum, scoring a standardized directive (PPAT, KFD, DAP) with a validated instrument like FEATS as part of assessment, deciding between a directive and open-studio session structure, navigating informed consent and disposition for client-made artwork, or distinguishing an art-as-therapy approach from an art-psychotherapy approach for a given client.
Astronomer
Use when a task needs the judgment of an astronomer — calculating exposure time or signal-to-noise for a target, writing the feasibility math for a telescope-time proposal, reducing photometric or spectroscopic data, distinguishing a systematic error floor from statistical noise, or reviewing an observational result for calibration or upper-limit red flags.
Athletic Trainer
Use when a task needs the judgment of a certified athletic trainer — triaging an on-field or on-court injury, deciding same-day return-to-play vs. refer-out, running a concussion sideline assessment and graduated return-to-sport progression, recognizing exertional heat stroke or another sudden-death emergency, or writing the objective findings that justify a clearance decision.
Atmospheric Scientist
Use when a task needs the judgment of an atmospheric scientist/operational meteorologist — interpreting ensemble forecast guidance, deciding whether conditions cross a severe-weather warning threshold, calibrating a raw model probability against verification climatology, or writing a forecast discussion or warning product under time pressure.
Audio Video Technician
Use when a task needs the judgment of an audio and video technician — setting up and operating audio/video equipment for a live event (concert, conference, keynote, broadcast remote), coordinating wireless mic frequencies on site, diagnosing a live audio/video signal-chain failure during a show, or sequencing a load-in against a fixed doors-open deadline.
Audiologist
Use when a task needs the judgment of an audiologist — interpreting an audiogram to classify hearing-loss type and severity, deciding whether a conductive component warrants an ENT referral before amplification, verifying a hearing-aid fitting against prescriptive targets, screening a vestibular/balance complaint, or writing an audiometric report for a referring physician.
Audiovisual Equipment Installer
Use when a task needs the judgment of an audiovisual equipment installer/repairer — diagnosing an EDID or HDCP handshake failure between a source and a display, sizing a display's screen size and brightness for a room's viewing distance and ambient light, specifying an HDMI/HDBaseT/AVoIP signal run against its rated distance ceiling, designing conference-room speaker placement and acoustics, or drawing the install-vs-programming boundary with a control-system (Crestron/Extron/AMX) integrator.
Author
Use when a task needs the judgment of a professional author — drafting or structurally revising a novel or narrative-nonfiction manuscript, writing a query letter or book proposal, evaluating a publishing contract's royalty and rights terms, or diagnosing why a manuscript is getting rejected.
Auto Body Repairer
Use when a task needs the judgment of an auto-body-repairer — deciding whether a damaged structural component gets pulled or replaced, reconciling an insurance estimate against actual teardown damage, writing a supplement, determining whether a repair triggers ADAS recalibration, or checking a proposed repair against an OEM position statement.