# LSSM

> We build focused software businesses and reuse what proves useful.

Find a career agent, run a company, shape a product or bring a useful contribution. Start with your situation, the work to do or the people doing it.

We build around practical human needs: a career step, a contribution, a community, a business or work worth sharing.

Pages are in English; add `?lng=fr` for French where it is published (for example https://lssm.co/?lng=fr).

## Start here

- [One ecosystem. Many ways forward.](https://lssm.co/?lng=en): Find a career agent, run a company, shape a product or bring a useful contribution. Start with your situation, the work to do or the people doing it.
- [Build capability that people can keep](https://lssm.co/network/company/operating-model/?lng=en): We build around practical human needs: a career step, a contribution, a community, a business or work worth sharing.
- [Products, ventures and useful possibilities](https://lssm.co/network/company/projects/?lng=en): Find the company, product or initiative that fits what you want to do.
- [Capabilities across the ecosystem](https://lssm.co/network/company/capabilities/?lng=en): Explore capabilities, product coverage, audiences and directions.
- [Areas of work](https://lssm.co/network/company/areas/?lng=en): Explore LSSM through the problems people are trying to solve.
- [Families & ecosystems](https://lssm.co/network/company/families/?lng=en): Shared product lineages and functional ecosystems across the portfolio.
- [Build something useful together](https://lssm.co/network/company/partnerships/?lng=en): Bring a product need, a venture idea, a community challenge or expertise worth sharing. Begin with the people it serves and the outcome you want.
- [Your life. Your work. Your way.](https://lssm.co/network/identity/?lng=en): An LSSM account should make the ecosystem fit you: your chosen context, habits and preferences, under your rules.
- [Patio — shared infrastructure and data](https://lssm.co/network/patio/?lng=en): Patio — the shared infrastructure and data foundation. Explore reusable services, governed data and focused product interfaces.

## Products and ventures

- [ArtisanOS — L’administratif des artisans, organisé autour du métier](https://lssm.co/network/company/brands/artisanos/?lng=en): Demandes clients, devis, commandes et documents : gardez le fil de votre activité avec une aide adaptée à votre façon de travailler. Les profils terrain et atelier gardent chacun leurs mots et leur navigation.
- [BillingOS — Keep quote-to-cash connected and reviewable](https://lssm.co/network/company/brands/billingos/?lng=en): Country-neutral billing contracts and reusable workspaces for quotes, invoices, credit notes, payments and reconciliation. Optional France-specific readiness and provider adapters sit around the core, while CompanyOS supplies operator review composition.
- [Briefhand — Expert missions organised around briefs and evidence](https://lssm.co/network/company/brands/briefhand/?lng=en): A precise mission workspace that keeps the mandate, supporting material, decisions and next commitments together. Its vocabulary and compact document hierarchy fit expert client work.
- [CommunicationOS — Conversations with clear context and boundaries](https://lssm.co/network/company/brands/communicationos/?lng=en): A reusable communication application kit with inbox, spaces, rooms, official channel connections, search, meetings, governed work and forms. The same canonical route and authority model supports standalone and embedded hosts.
- [CompanyOS — Business assistance grounded in your company’s context](https://lssm.co/network/company/brands/companyos/?lng=en): A general company workspace and adaptable business foundation. Documents, conversations and prepared work come together around the team’s responsibilities, with sources and review visible.
- [ContractSpec Studio — Turn meetings and product signals into approved work](https://lssm.co/network/company/brands/contractspec-studio/?lng=en): A review-first product decision and delivery workspace. ContractSpec Studio connects meetings and product signals to briefs, priorities, issues and approved handoffs, with the evidence and review history kept close to the work.
- [Crossrole — Career changes built on your existing experience](https://lssm.co/network/company/brands/crossrole/?lng=en): A career-transition experience that makes the connections between experience, target requirements and possible wording visible. Compare a few directions before committing.
- [D’un bon pas — Vos expériences mises en mots pour candidater](https://lssm.co/network/company/brands/dunbonpas/?lng=en): Une expérience accueillante pour raconter une situation, reconnaître ce qu’elle montre et trouver des mots utiles pour candidater. Des étapes courtes, un carnet lisible et des exemples concrets.
- [Fairelio — Useful work, clear commitments, room to choose](https://lssm.co/network/company/brands/fairelio/?lng=en): Fairelio brings people and organisations around useful work: scoped missions, clear commitments, learning and contribution. Make the need, the terms and the next decision concrete.
- [Fellowhand — Prepared replies and briefs for business owners](https://lssm.co/network/company/brands/fellowhand/?lng=en): An owner-focused experience for priorities, preparation and next steps. A composed review queue brings attention, missing information and responsibility into one readable view.
- [FinanceOS — Financial evidence across companies and decisions](https://lssm.co/network/company/brands/financeos/?lng=en): A finance operations platform for budgets, commitments, cashflow, multi-entity ledgers, consolidation, planning and close. BillingOS owns commercial quote-to-cash; FinanceOS owns the financial acceptance and planning boundary. The source also contains a deterministic Finance Ops workflow template.
- [GTM Learning Loop — Choose the next useful market experiment](https://lssm.co/network/company/brands/gtm-learning/?lng=en): Use campaign, conversation and deal evidence to refine an ICP, inspect a small cohort and prepare a reviewed message experiment.
- [hCircle — Everyday connection and shared community work](https://lssm.co/network/company/brands/hcircle/?lng=en): A project for human relationships and shared communities, with attention to consent, context and the practical work of living together.
- [Jobrally — Guided job search for active candidates](https://lssm.co/network/company/brands/jobrally/?lng=en): An active job-search experience organised around a manageable queue, clear decisions and visible progress. Prepared application work and completed submissions remain distinct.
- [Lettercase — Targeted applications grounded in your actual experience](https://lssm.co/network/company/brands/lettercase/?lng=en): An editorial workspace for the opportunity brief, source examples and application draft. The scope includes CV material, letters and supporting examples, with revisions and approval easy to identify.
- [LetterPatio — Postal correspondence for your workflows](https://lssm.co/network/company/brands/letterpatio/?lng=en): A proposed boundary for physical letters, print-and-post workflows and delivery evidence, with formal digital correspondence connected to its own governed services.
- [MailPatio — Email inboxes for your app](https://lssm.co/network/company/brands/mailpatio/?lng=en): Embedded email infrastructure for dedicated addresses, workflow-linked messages and explicit application access. Its public website explains the proposed model with a fictional interactive example; live mailbox service and production intake remain disabled.
- [OSINT — External intelligence with traceable evidence](https://lssm.co/network/company/brands/osint/?lng=en): A source-backed intelligence and acquisition platform for datasets, companies, jobs and people. Its console connects source health, research, evidence, freshness and recovery; API, CLI, MCP and worker hosts share the same OSINT bundle.
- [Personal agency — Turn what matters into observable progress](https://lssm.co/network/company/brands/personal-agency/?lng=en): PersonalOS mission, goals, Today plans, habits, check-ins, missed-day recovery, weekly review and life administration. Explicit choices and observations remain under personal control.
- [Personal health — Your wellbeing history, with provenance](https://lssm.co/network/company/brands/personal-health/?lng=en): Consent-controlled, non-clinical wellness history, corrections, descriptive trends and bounded wellbeing goals. PersonalOS displays minimized source status and observations, with rights and sharing under the person's control.
- [PersonalOS — One calm place for what matters today](https://lssm.co/network/company/brands/personalos/?lng=en): The composed personal workspace for Today, goals, wellbeing, household support, review and privacy, with explicit consent, human control and recovery.
- [PhonePatio — Phone identity, calls and messages for your app](https://lssm.co/network/company/brands/phonepatio/?lng=en): A proposed channel product for dedicated numbers, inbound and outbound voice, SMS, MMS and RCS. PhonePatio and TelPatio remain alternative names for this one telephony scope; carrier support and service implementation are to establish.
- [Sarla — The right introduction, with shared intent](https://lssm.co/network/company/brands/sarla/?lng=en): Sarla connects candidates and employers through relevant, human-reviewed introductions. Its candidate, employer and operator workspaces bring role clarification, career context, evidence-aware matching and explicit approval before anything is shared.
- [SocialPatio — Social channels with clear permissions](https://lssm.co/network/company/brands/socialpatio/?lng=en): A proposed service boundary for social accounts, publishing, comments, permission-dependent direct messages and evidence-aware listening. Shared source building blocks exist; the branded service remains to establish.
- [Tafio — A career agent for your next move](https://lssm.co/network/company/brands/tafio/?lng=en): Tafio is a product in its own right as well as the foundation for a family of focused career experiences. Start with the general career agent, or choose a more specific way into the same work.
- [Taketide — Clear briefs for creators and brands](https://lssm.co/network/company/brands/taketide/?lng=en): Taketide is the UGC platform for creators and brands: a clear brief, a suitable collaboration and content worth sharing. Its marketing and app experiences support creator discovery, campaign work and review.
- [Tellshift — Turn team expertise into useful outreach](https://lssm.co/network/company/brands/tellshift/?lng=en): Turn project knowledge into campaign drafts and outreach that the people behind the work can review and approve.
- [Tendframe — Founder decisions grounded in evidence and capacity](https://lssm.co/network/company/brands/tendframe/?lng=en): A private founder workspace for what changed, what matters and what needs a decision. Bring company evidence, personal priorities, health and energy into the review, with explicit boundaries and selective sharing.
- [Usage & metering — Usage evidence that adds up](https://lssm.co/network/company/brands/usage-metering/?lng=en): Shared metering records feature and operation usage with allocation dimensions, exact quantities, idempotency and superseding corrections. PostHog metering and company-metrics adapters provide related reads; business aggregates remain distinct from the usage evidence that BillingOS rates.
- [VoicePatio — Speech and voice interaction for your app](https://lssm.co/network/company/brands/voicepatio/?lng=en): A proposed experience for transcription, speech generation and voice-agent conversations, composed from bounded shared voice capabilities rather than a phone-number or carrier service.
- [Web acquisition & scraping — Search, scrape and browse through one layer](https://lssm.co/network/company/brands/web-acquisition/?lng=en): The shared web-access layer routes search, extraction, crawling, research, rendered browser sessions and proxies through explicit provider adapters. Supported surfaces are recorded individually instead of assuming every provider supports every transport.

## ContractSpec on lssm.co

- [Make software behavior easier to understand and reuse.](https://lssm.co/about/?lng=en): ContractSpec is developed within LSSM, with a focus on explicit product behavior, adaptable interfaces and composable capabilities.
- [Start with one operation in your existing codebase.](https://lssm.co/adoption/?lng=en): Evaluate a useful boundary before deciding how far ContractSpec should extend into your product.
- [Build with the pieces. Use them together.](https://lssm.co/ecosystem/?lng=en): ContractSpec provides the core specifications and reusable building blocks. LSSM OS brings those pieces into an integrated product, within a wider LSSM ecosystem.
- [How CompanyOS uses the ContractSpec foundation.](https://lssm.co/ecosystem/companyos/?lng=en): A source-based case study of application composition, with the boundaries between reusable infrastructure and product-specific work kept visible.
- [Know where the rules become execution.](https://lssm.co/trust-boundaries/?lng=en): Understand what ContractSpec describes, what the configured runtime checks and what your application still owns.
- [Find the exact definition.](https://lssm.co/reference/?lng=en): Search the inspected source reference by name, type or responsibility. Authored guides explain the model; reference entries describe specific contracts and APIs.
- [The LSSM Experience Studio](https://lssm.co/experience/?lng=en): Shape a working app for life or work. Plan, create, inspect and adapt a useful next step.
- [Examples](https://lssm.co/examples/?lng=en): Find a focused example by the behavior you need.
- [Use the docs with coding agents](https://lssm.co/docs/agent-readable-docs/?lng=en): Give an agent a small, versioned source set and keep documentation lookup separate from action authority.
- [Expose one operation through API and MCP](https://lssm.co/docs/api-mcp/?lng=en): Share the registered behavior while keeping authentication, transport formats and evidence explicit.
- [Authentication, policy and scoped approval](https://lssm.co/docs/approval-policy/?lng=en): Give each decision a clear owner and prove that denied requests never reach the protected handler.
- [Agents, execution and context](https://lssm.co/docs/areas/agents-and-context/?lng=en): Build agent behavior from explicit tools, bounded execution, qualified models and provenance-aware context.
- [Application composition and product hosts](https://lssm.co/docs/areas/app-composition/?lng=en): Assemble reusable modules, runtimes and integrations into an actual product with owned routes, authority and operational dependencies.
- [Billing, finance and economic evidence](https://lssm.co/docs/areas/billing-and-finance/?lng=en): Model commercial lifecycles, exact money and reviewable financial handoffs with provider and country boundaries kept explicit.
- [Communication and notifications](https://lssm.co/docs/areas/communication-and-notifications/?lng=en): Compose messaging, delivery, channels and notifications around scoped journals and current send authority.
- [Company, work and service operations](https://lssm.co/docs/areas/company-and-work/?lng=en): Connect operating goals, shared work, planning, meetings and support through their canonical domain boundaries.
- [Content, growth and creator operations](https://lssm.co/docs/areas/content-and-growth/?lng=en): Move from source-grounded drafts and optimization reports to reviewed publishing, measurement and commercial lifecycle evidence.
- [Core contracts and features](https://lssm.co/docs/areas/core-contracts/?lng=en): Define the behavior, references and composition rules that other parts of a product can share.
- [Delivery, infrastructure and runtime operations](https://lssm.co/docs/areas/delivery-and-infrastructure/?lng=en): Connect source intent, governed plans and provider execution through exact revisions, receipts and recoverable operational state.
- [Examples and implementation patterns](https://lssm.co/docs/areas/examples-and-patterns/?lng=en): Learn from maintained source and fixtures, then adapt the smallest pattern that demonstrates the behavior you need.
- [Forms, data views and data exchange](https://lssm.co/docs/areas/forms-and-data/?lng=en): Collect structured input, present records, and plan governed import/export flows using shared models and explicit host ports.
- [Governance, decisions and approvals](https://lssm.co/docs/areas/governance-and-approvals/?lng=en): Resolve policy and review decisions into explicit evidence before consequential work is allowed to proceed.
- [Identity, access and subject context](https://lssm.co/docs/areas/identity-and-access/?lng=en): Carry trusted actor and tenant context through product requests, agent actions and shared runtime projections.
- [Documentation by area](https://lssm.co/docs/areas/?lng=en): Explore every system area and its available building blocks.
- [Integrations and provider selection](https://lssm.co/docs/areas/integrations-and-providers/?lng=en): Choose concrete external capabilities through provider-neutral contracts, explicit connections and observable runtime bindings.
- [Intelligence, research and applications](https://lssm.co/docs/areas/intelligence-and-research/?lng=en): Manage discovered sources, evidence-backed facts and candidate-authorized application work through explicit lifecycle boundaries.
- [Knowledge, retrieval and evidence](https://lssm.co/docs/areas/knowledge-and-retrieval/?lng=en): Turn authorized source material into retrievable, cited context while preserving its source, scope and freshness.
- [Observability, testing and qualification](https://lssm.co/docs/areas/observability-and-testing/?lng=en): Follow behavior across boundaries and distinguish declared support from evidence that a selected composition works.
- [Personal workflows, learning and progress](https://lssm.co/docs/areas/personal-and-learning/?lng=en): Compose subject-controlled personal workflows and learning experiences with explicit consent, replay and progress semantics.
- [Handlers, runtimes and transports](https://lssm.co/docs/areas/runtime-adapters/?lng=en): Connect declared operations to supplied handlers, client state and the transport your application actually runs.
- [Schemas, types and results](https://lssm.co/docs/areas/schemas-and-results/?lng=en): Make input, output, serialization and failure behavior explicit across the boundaries your product exposes.
- [CLI, authoring and agent tooling](https://lssm.co/docs/areas/tooling-and-agent-delivery/?lng=en): Navigate the command host, source analysis, documentation generators and native agent-pack delivery used to work on ContractSpec projects.
- [Interfaces, presentations and design](https://lssm.co/docs/areas/ui-and-presentations/?lng=en): Compose contract-driven views, role-aware operating surfaces and shared design primitives for web and native hosts.
- [Workflows, jobs and automation](https://lssm.co/docs/areas/workflows-and-automation/?lng=en): Compose repeatable work with explicit state, persistence, branching and operation-execution responsibilities.
- [Contracts, handlers and adapters](https://lssm.co/docs/contracts-handlers-adapters/?lng=en): Understand the separate responsibilities that let one operation serve several interfaces.
- [Contribute a reviewable change](https://lssm.co/docs/contributing/?lng=en): Change the owning source, update the public explanation and bring evidence for the behavior you touched.
- [Core ContractSpec guides](https://lssm.co/docs/core/?lng=en): Follow the core model from a first operation to shared interfaces and runtime boundaries.
- [Adopt ContractSpec in an existing codebase](https://lssm.co/docs/existing-codebase/?lng=en): Wrap one behavior you already own, preserve its observable behavior, and expand from evidence.
- [Compose features with explicit dependencies](https://lssm.co/docs/feature-hubs/?lng=en): Connect capabilities, operations and provider ports without hiding what a feature needs to execute.
- [Read your first operation](https://lssm.co/docs/first-operation/?lng=en): Trace a maintained contract from its input schema to its deliberately small handler.
- [Generation and drift: what changes, what does not](https://lssm.co/docs/generation-drift/?lng=en): Use derived artifacts deliberately and understand the current boundary of generation plans and apply.
- [Installation and release channels](https://lssm.co/docs/installation-release-channels/?lng=en): Match documentation to the code you actually consume, then verify a small external project.
- [Bind external services deliberately](https://lssm.co/docs/integration-boundaries/?lng=en): Keep a feature's requirements separate from credentials, tenant connections and provider behavior.
- [Observe a call without confusing it with approval](https://lssm.co/docs/observability/?lng=en): Use traces and outcomes to diagnose execution, and keep durable evidence requirements explicit.
- [Package directory](https://lssm.co/docs/packages/?lng=en): Browse all workspace packages, capabilities, guides and declared import paths.
- [Find the right reference](https://lssm.co/docs/reference-map/?lng=en): Navigate portable models, runtime execution, adapters and generated contract records by responsibility.
- [Build interfaces around roles and intent](https://lssm.co/docs/role-aware-interfaces/?lng=en): Resolve appropriate surfaces for people and agents while keeping authority on the execution side.
- [What the runtime checks](https://lssm.co/docs/runtime-boundaries/?lng=en): Follow a call from transport context to handler execution, then understand the limits of each guard.
- [Model inputs, outcomes and failures](https://lssm.co/docs/schema-and-results/?lng=en): Make the data boundary explicit while keeping business meaning in the operation and handler.
- [Test the promise at the boundary](https://lssm.co/docs/testing/?lng=en): Choose checks that establish meaningful behavior, including denied effects and real consumer imports.
- [Find the boundary that failed](https://lssm.co/docs/troubleshooting/?lng=en): Diagnose package, schema, execution and transport failures without changing several layers at once.
- [Version contracts and documentation together](https://lssm.co/docs/versioning/?lng=en): Keep operation identity, package releases and deployment revisions distinct when reviewing a change.

## ContractSpec examples

- [Build a table from a data view](https://lssm.co/examples/data-grid-showcase/?lng=en): Compare a declarative account table with the shared client and server controller surfaces.
- [Draft freely. Send with approval.](https://lssm.co/examples/draft-and-send-agent/?lng=en): Follow one contract boundary through a workflow and an in-memory MCP transport.
- [Compose nine feature hubs](https://lssm.co/examples/feature-hub-composition/?lng=en): Inspect one application composition with matching semantic routes for web and native.
- [Capture now, complete when ready](https://lssm.co/examples/form-showcase/?lng=en): Use form contracts to accept a minimal intake while keeping missing readiness fields visible.
- [Write your first contract](https://lssm.co/examples/minimal-user-contract/?lng=en): Follow user.create from an email schema to a typed handler. Start with the smallest maintained example.
- [Answer against a named knowledge snapshot](https://lssm.co/examples/policy-safe-knowledge-assistant/?lng=en): Trace a deterministic answer to approved rule versions, then inspect how citations change after review and publication.
- [Review an agent's migration proposal](https://lssm.co/examples/release-steward/?lng=en): Follow a deterministic release migration through scoped subagents, digest-bound approval, and a draft PR receipt.
- [Turn a request into bounded technical proof](https://lssm.co/examples/request-to-verified-proof/?lng=en): Inspect a fixed request, a reviewed plan, and a recorded or explicitly enabled loopback proof.
- [Stop a write before it runs](https://lssm.co/examples/required-approval/?lng=en): Trace a REST request through an approval gate and inspect the zero-handler-call denial assertion.
- [Adapt the view. Preserve the boundary.](https://lssm.co/examples/rolemorph-approvals/?lng=en): Inspect role-specific approval surfaces where adaptive hints cannot grant authority.
- [Trace a signal to a reviewable outcome](https://lssm.co/examples/support-to-product/?lng=en): Walk a support-to-product scenario through permissions, correction replay, and an evidence receipt.

## Related LSSM sites

- [LSSM technology](https://lssm.tech/?lng=en): technical foundations.
- [LSSM World](https://lssm.world/?lng=en): editorial journal.
- [LSSM atlas](https://lssm.xyz/?lng=en): the ecosystem atlas.
- [LSSM.pics](https://lssm.pics/?lng=en): the visual collection.
- [ContractSpec](https://www.contractspec.io/): one definition of product behavior for APIs, interfaces and agents.

## Optional

- [Full page index](https://lssm.co/llms-full.txt): every indexable page on this host with its description.
- [Sitemap](https://lssm.co/sitemap.xml): canonical English and French URLs.
- [LinkedIn](https://www.linkedin.com/company/lssm-tech)
- [ContractSpec package directory](https://lssm.co/docs/packages/?lng=en): manuals for every ContractSpec package; each is listed in the full page index.