Unwrapped

Teardown · tessl

TESSL

TESSL

CategoryDev ToolsValuation · $750M · 2024Site ↗
  • Index Ventures
  • Accel
  • GV (Google Ventures)
UX wrapper

Open-source library docs + frontier code models + CLI package manager.

01

Public data / API layer

Internal replication score

Easy
0.85

Feasibility of a useful internal substitute built with Claude (or similar), the same data access, and light agent logic — not rebuilding the whole product.

IRS = 0.30·D + 0.25·L + 0.20·O + 0.15·R + 0.10·Sthis record · 85%
  • D

    Data accessibility

    weight 0.300.95
    • 1.0mostly customer-owned / public / standard third-party sources
    • 0.5mixed accessibility
    • 0.0hard-to-access or proprietary source layer
  • L

    LLM substitutability

    weight 0.250.90
    • 1.0mostly retrieve / prompt / cite / summarize / classify / compare
    • 0.5mixed standard + custom behavior
    • 0.0strongly custom model behavior (fine-tunes on proprietary data, etc.)
  • O

    Output simplicity

    weight 0.200.85
    • 1.0straightforward internal work product (memo, list, reply, SQL query)
    • 0.5moderately specialized
    • 0.0highly specialized (e.g. FDA-graded clinical text)
  • R

    Review / risk tolerance

    weight 0.150.85
    • 1.0internal use with human review is acceptable
    • 0.5moderate risk
    • 0.0very low tolerance for error (e.g. external legal filings)
  • S

    Surface complexity

    weight 0.10inverse — higher means less surface dependence0.40
    • 1.0a simple internal shell is enough
    • 0.5polished workflow matters somewhat
    • 0.0product surface / rollout / trust posture is central to value
LabelsEasy ≥ 0.67Medium ≥ 0.34Hard < 0.34

Missing factor rows use heuristics from wrapper scores. Editorial heuristic, not investment advice.

Build it yourself

Recreate the workflow inside your org.

Internal build

Build it yourself

Same package docs + code model + local skill store — lacks cross-repo distribution and continuous eval.

Internal use only. Replacing them in-market is a different bar than replaying the useful workflow inside your org.

01 · Connectors & flow

npm registry
npm registry
PyPI
PyPI
GitHub public repos
GitHub public repos
Open-source documentation
Open-source documentation
Customer codebases
Customer codebases

Internal build map

Data in

Connectors
Connectors

Agent layer

Planner
Tools + retrieval
Reasoning model

Logic

LLM API
retrieve context
version skills
evaluate
cite sources
not custom weights

Outputs

Internal search
Answer
Citations

02 · Claude / agent prompt

Paste as the system or developer message in Claude (or your agent runtime). Scroll to read; Copy grabs the full text.

Claude / agent prompt

// Context-aware code generation agent for [YOUR_TEAM] You are a coding agent inside [YOUR_COMPANY]'s engineering organization. You help developers write code using ONLY: - Public package documentation (npm, PyPI, official library docs) - Internal codebase conventions and APIs from local files - Security and compliance rules defined by the team ## What you must do 1. Retrieve first: Before generating code, fetch versioned context about the library, internal API patterns, and security constraints 2. Stay version-matched: Use imports and API calls that match the exact dependency versions in the project lockfile 3. Cite conventions: Reference internal coding standards, naming patterns, and architectural decisions when suggesting implementations 4. Surface conflicts: Flag deprecated patterns, security violations, or deviations from team conventions 5. Scope: Only generate code for libraries and APIs with available context bundles ## What you are not Not a substitute for code review or security audits. All generated code requires human inspection before merge. Internal use only. ## Refusal Refuse if asked to generate code for a library without context, suggest patterns that violate internal security rules, or produce code that conflicts with versioned skill definitions. ## Safety Internal agent with human-in-the-loop approval. All output is logged and reviewed before production deployment.

03 · Result

Add authentication to the /api/users endpoint using our internal auth library
customer-codebase

Uses internal auth middleware per team conventions, includes required error handling and logging hooks.