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<img src="docs/assets/banner.jpg" alt="Gecko — the web wasn't built for agents. Yet." width="100%"> <h1 align="center">Stop letting your agent guess</h1> Check the call before it counts. Gecko is open-source and runs on your machine: one command maps any API — messy, paywalled, or on-chain — into a call graph your agent checks instead of guesses from, and anything that spends is simulated to a receipt first. No wallet, no payment rail, no key held — 64 mainnet transactions, 49 with a cost predicted before signing, 47 of those exact to the unit (re-read from the chain, 2026-09-19). <a href="https://www.python.org/"><img src="https://img.shields.io/badge/python-3.11+-3776AB.svg" alt="Python 3.11+"></a> <a href="https://modelcontextprotocol.io/"><img src="https://img.shields.io/badge/surface-MCP-D97757.svg" alt="MCP"></a> <a href="#development"><img src="https://img.shields.io/badge/tests-5043%20passing-2E7D32.svg" alt="tests"></a> <a href="LICENSE"><img src="https://img.shields.io/badge/license-Apache--2.0-5C6BC0.svg" alt="Apache 2.0"></a> <a href="https://x402.org/"><img src="https://img.shields.io/badge/x402-stub%20%7C%20live-9945FF.svg" alt="x402"></a> <a href="#quick-start">Quickstart</a> · <a href="https://docs.geckovision.tech">Docs</a> · <a href="docs/architecture.md">Architecture</a> · <a href="#faq">FAQ</a> · <a href="SECURITY.md">Security</a>  > **Built for the calls your agent must not get wrong.** Two axes, either one qualifies: > a **messy surface** (paywalled, drifting, undocumented, on-chain) or a **high-stakes > action** (your agent runs unattended with credentials or money). ## What Gecko is Gecko is an **open-source knowledge graph built specifically for AI agents that call APIs**. Point it at an OpenAPI spec, a docs site, or a Solana program's IDL and source, and it reads that surface into a graph your agent traverses — every fact tagged with where it came from, and anything it cannot establish **flagged rather than guessed**. A specification tells your agent what a call *looks like*. It cannot tell it whether the call will *work*. That gap is in every spec, including a perfect one, and it is where agents fail expensively: not on the call that errors, but on the call that is accepted and wrong. Gecko closes it by handing back one specific call — and, for anything that spends, by simulating that call against real state first and returning a **receipt**. It is not the agent and not an orchestrator. It holds no key, signs nothing, broadcasts nothing, and stores no response payload — it stores surfaces and correctness metadata, never your data. ## Quick start No install: ```bash npx @geckovision/gecko doctor # 1. check your environment npx @geckovision/gecko add <spec-or-docs> # 2. comprehend it — $0, no live call npx @geckovision/gecko report <spec> # 3. get the scorecard — grade + findings npx @geckovision/gecko serve <spec> # 4. your agent uses it over MCP ``` Or install once: ```bash npm install -g @geckovision/gecko # prebuilt binary — no Python needed uv tool install "gecko-surf[serve]" # or pip, if you want the Python package gecko add <spec-or-docs> ``` Plug into your agent: ```bash # Claude Code claude mcp add my-api -- npx -y @geckovision/gecko serve <spec> --stdio # Cursor / VS Code / any MCP client — mcp.json { "mcpServers": { "my-api": { "command": "npx", "args": ["-y", "@geckovision/gecko", "serve", "<spec>", "--stdio"] } } } ``` Going live is a separate, deliberate step: ```bash gecko auth set <provider> # key goes to your OS keychain — never mcp.json ``` Then your agent asks questions, not endpoints: ``` Which fixtures kick off in the next hour, and what are the current odds? What is the peg state of USDC right now? Plan a swap of SOL for USDC on Meteora, bin_step 4. ``` ## Why An OpenAPI says what exists. An IDL says what a program looks like. Neither is enough to act: - Docs drift. Working integrations broke twice in 2026 from silent layout changes. - IDLs drop facts. A required Pump.fun account never appears in the IDL at all. - Agents guess. A wrong guess posts a charge, reverts a transaction, burns fees. Gecko replaces the guess with a graph: - **Every edge carries provenance** — `extracted` from the surface, `recovered` from source, or honestly `flagged` as unknown. Never fabricated. - **Every action can be verified first** — simulated on a $0 mainnet fork to a **receipt**: pass, or a classified revert, before any spend. - **Every failure teaches** — outcomes land in a categorical corpus; a drift series flags when a provider ships a change that breaks a working call. - **Auth is invisible to the agent** — keys injected at call time from your keychain. The model never sees a credential. ## Under the hood Most agent-tool layers are thin wrappers. Gecko is a memory substrate, and three of its design choices are deliberately different from the textbook: | Choice | Why it matters | |---|---| | **Deterministic semantic memory** — lexical retrieval, no vector DB | the graph never "approximately" remembers; BM25 and vectors sit behind evidence gates | | **Self-generated episodic memory** — categorical outcomes + a drift series | Gecko re-simulates to create its own episodes; no dependence on your data plane, no payloads stored | | **Typed procedural memory** — plans as executable JSON | landing plans and derive orders a builder can run; text loses the join, ours can't | And the depth is measured, not asserted: - **The overlay artifact.** For every auto-comprehended program, Gecko emits the exact list of facts that could **not** be derived from any public surface ([`overlays/`](gecko/providers/configs/orquestra/overlays/)) — the value of comprehension, quantified per program. - **Seven security layers, fail-closed:** spec sanitizer · per-tool quarantine · image Skill Guard · SSRF netguard · out-of-band auth anchoring · verdict signing gate · an AST-enforced never-sign boundary. - **The numbers:** 5,043 tests · 64 mainnet transactions, 47/49 predictions exact · 5 paid by a fee relay, the buyer holding no SOL, the last four a USDG→USDC→purchase route · 8 Solana programs wired, 4 differential-proven · 2 live receipt-pairs · −77%/−89% measured context cuts · a 4,534-program catalog listed · 0 auth headers exposed across 14 real specs. **Explore the diagrams:** [architecture on docs.geckovision.tech](https://docs.geckovision.tech/architecture) (all three views, rendered) · [the map in this repo](docs/architecture.md) ## Proof, not promises Live, on a mainnet fork, $0: | Case | Naive path | Gecko | |---|---|---| | Pump.fun buy | ❌ reverts — `AccountNotInitialized (3012)` | ✅ lands — 86,669 CU | | Pump.fun sell | ❌ transfers the tokens, then reverts — `InvalidBondingCurveV2 (6074)` | ✅ lands — 50,783 CU | | Meteora DLMM swap | ❌ reverts — derive-only, no ATA/wrap/bin-array preludes | ✅ wrap → swap → unwrap — 81,964 CU | | Meteora pool derivation | ❌ stale 3-seed scheme → the wrong pool, silently | ✅ correct 4-seed derivation, differential-proven | | Docs-only API (no spec) | agent invents endpoints | ✅ draft spec recovered, verified `VERIFIED/REFUTED` | The facts behind those passes are not on any surface: a 4th PDA seed the SDK added in 2024, an account the IDL only mentions in prose, a fee field resolved by a refuting simulation. That is the graph your agent traverses. ## Use cases **TxLINE (paywalled sports odds) — without vs with Gecko** ![70-second demo — 18 first-call-correct tools, 8/8 poisoned attacks blocked, 32/32 correctness checks](docs/assets/launch.gif) · [MP4](docs/assets/launch.mp4) **Cross-API correlation — three APIs, one question** Pegana × Birdeye × Jupiter joined on a declared entity; the agent plans across surfaces first-try. Try it: `gecko graph svg <spec>` renders any surface's call graph. **Solana programs — buy a coffee on mainnet** Everything above is a $0 fork. This one is not: **real mainnet, real USDC, a real espresso.** [`let_me_buy`](https://letmebuy.app) is a storefront program on Solana. A merchant stands up a store and lists products priced in USDC; a buyer scans a QR code and pays. One account per store — `PDA(["receipts", store_name])` — holds the menu, the receipts, the running count and the merchant's authority. <img src="docs/assets/coffee.gif" alt="An agent resolves a store name to its own on-chain accounts, predicts the compute cost, signs in an enclave, and settles a real 0.1 USDC espresso on Solana mainnet" width="820"> [MP4 version](docs/assets/coffee.mp4) — one unedited take. The receipt says **24,956 CU** before anything is signed; the chain charges **24,956 CU** ([`4X8dCyZU…`](https://solscan.io/tx/4X8dCyZUNJHrFjFQqaNDjaLsya7ZLJ7gvjhAE6Zv7JV6AgeiGtGt9F5iJykJswvUb6MgdBcH5D6ERvxrjCFsbk5e), slot 439046190). The key never leaves its enclave. ```bash uvx --from "gecko-surf[serve,solana]" gecko-orquestra --program let_me_buy --stdio ``` **Two facts the IDL does not carry, and both break the call:** - `mark_as_delivered` declares its `receipts` seed as `store_name`, but that instruction's own arguments are `_store_name` and `receipt_id`. The seed names an argument that does not exist, so a deriver resolving seeds by argument name gets nothing for the one seed that selects the store. Gecko binds by seed **value**. - In `make_purchase` the store's `authority` is writable but **not a signer**. The buyer pays from `ATA(signer, mint)`; the store is credited at `ATA(authority, mint)` — same mint, different owner. Derive both from one owner and you have built a purchase that pays the buyer back. Gecko refuses that plan before a builder is ever asked. **The prediction tracks state, not a memorised constant.** Three purchases at this one storefront were charged 23,789 → 24,183 → 24,956 CU; the last two are the *same product*. Each sale appends a receipt to the store's account, so the program does more work — and the receipt predicted the new number each time it was asked. Gecko recovers what the surface drops, [Orquestra](https://orquestra.dev) builds the instruction, and the receipt says whether it lands — before any signature. ## Architecture <img src="docs/assets/architecture.png" alt="Gecko architecture — untrusted surfaces → provenance knowledge graph → verified action (simulate → receipt → external signer)" width="860"> **Control plane, never data plane.** Gecko stores surfaces + correctness metadata — never response payloads, user data, or secrets. 1. **Ingest** — OpenAPI / docs / IDL / program source → sanitized, quarantine-checked. 2. **Comprehend** — normalized ops, recovered PDA seeds, generated configs + measured overlays. 3. **Know** — the provenance graph (surface, program, cross-API joins). 4. **Project** — question-shaped tools over MCP; auth stripped; −77%/−89% context cuts measured on two real specs. 5. **Verify** — plan → external builder → simulate → **receipt** → fail-closed signing gate. Gecko never signs, never broadcasts. 6. **Learn** — categorical outcomes → drift series → back into the graph. [Interactive diagrams](docs/architecture.md) · [llms.txt](architecture.llms.txt) · [Receipt semantics](docs/receipt.md) ## What you get | Capability | Entry point | |---|---| | Serve any API to agents over MCP | `gecko serve <spec>` | | Scorecard: grade + fixable findings + Playground | `gecko report <spec>` | | Recover a draft spec from human docs | `gecko from-docs <url>` | | First-call-correctness tests for CI | `gecko test <spec>` | | The surface graph, rendered | `gecko graph svg <spec>` | | Program Surface: recovered seeds + derive plans | `gecko orquestra --program <name>` | | find_start: intent → the right starting instruction | `gecko orquestra find-start "..."` | | Simulate → receipt on a built transaction | `gecko/simulate.py` (engine) | | Embed the SDK | `from gecko import AgentApiClient` | | Verify docs claims against reality | `gecko verify-docs <spec>` | | Scan a skill image for hidden payloads | `gecko scan-image <path>` | ## Skills The engine is the product; the skills are how an agent learns to drive it. Six of them ship as one plugin — markdown the agent reads, no executable logic of its own. ``` /plugin marketplace add GeckoVision/gecko-surf /plugin install gecko-surf@geckovision ``` | Skill | For | What it does | |---|---|---| | [`use-any-api`](skills/use-any-api/SKILL.md) | agent builder | Call an unfamiliar API first-call-correct — point Gecko at OpenAPI or docs, get intent-shaped MCP tools with auth hidden | | [`read-js-docs`](skills/read-js-docs/SKILL.md) | agent builder | Extract the API surface from JS-rendered docs, when `curl` returns an empty shell | | [`anti-poisoning`](skills/anti-poisoning/SKILL.md) | agent builder | Defend against a poisoned **spec** — one written to route your agent's arguments or exfiltrate your key | | [`skill-guard`](skills/skill-guard/SKILL.md) | agent builder | Defend against a poisoned **artifact** — an image or convention page carrying an instruction your agent will follow and your reviewer cannot see | | [`api-agent-ready`](skills/api-agent-ready/SKILL.md) | API provider | Make your own API's whole surface agent-usable, *alongside* whatever MCP you already ship | | [`x402-payai-setup`](skills/x402-payai-setup/SKILL.md) | API provider | Wire pay-per-call onto your API. You keep 100% — Gecko is not the rail and takes no cut | The two defense skills are one disease with two deliveries: a poisoned *spec* aims at what your agent **calls**, a poisoned *artifact* aims at what your agent **does**. Full map and status in [`skills/README.md`](skills/README.md). ## Modes - **Recorded** (default): $0, schema-synthesized responses, fully offline. Falsify everything before any live call. - **Live**: same code path; credentials injected from your keychain at the edge. `gecko auth set <provider>` — deliberate, never implicit. ## Hosted The engine in this repo also runs at [mcp.geckovision.tech](https://mcp.geckovision.tech) — comprehended surfaces served over Streamable-HTTP MCP, keys injected server-side. Developers never pay; providers pay a flat price per API. Gecko takes no cut, holds no funds, signs nothing. → [docs.geckovision.tech](https://docs.geckovision.tech) ## Repo map | Path | What | |---|---| | `gecko/` | the engine — ingest, catalog, tools, graphs, simulate, corpus | | `gecko/providers/` | program surfaces (Meteora, Pump.fun, Jupiter, ORE, MetaDAO) + configs | | `scripts/`, `gecko/cli.py` | thin transport — parse, call the package, format | | `skills/` | the agent-facing plugin — six skills, agents, commands | | `docs/` | architecture, receipt semantics, specs, benchmarks | | `examples/` | forkable starters | ## Development ```bash uv run ruff format && uv run ruff check --fix uv run mypy gecko uv run pytest # 5,043 passing uv run python -m gecko.demo # $0 recorded E2E ``` <details> <summary>FAQ</summary> **Is this a tool-generation wrapper?** No. Tool generation is the table stakes. The product is the verified graph (provenance on every edge), the receipt (simulate before money moves), and the drift series (know when a provider breaks you). **Who is it for?** Two axes — either one qualifies: a messy surface (paywalled, drifting, undocumented, on-chain), or a high-stakes action (your agent runs unattended with credentials or money). Clean API + a human reviewing the diff? You may not need us — and that's fine. **Does Gecko sign or hold funds?** Never. Gecko never signs, never broadcasts, never builds the production transaction — sim-only unsigned assembly is the documented carve-out, AST-enforced at the sign/send boundary. Building belongs to builders (e.g. Orquestra), signing to signers (wallet / TEE / you). **What does Gecko store?** Surfaces and correctness metadata. Never payloads, balances, pubkeys-in-outcomes, or secrets. The corpus is categorical, closed-vocabulary, audited. **Vector database?** No — retrieval is lexical and deterministic (token-overlap; BM25 and semantic tiers both sit behind evidence gates that flip only on measured recall failure — including one measured negative result on embeddings). **Is it free?** The engine is Apache-2.0, complete, self-hostable. The hosted layer is what an API provider buys. Developers never pay. </details> ## Contributing PRs welcome. Run the toolchain above before pushing. Security findings → [SECURITY.md](SECURITY.md). ## License Apache-2.0 — see [LICENSE](LICENSE).

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