tachyon-engineer - SKILL.md Agent Skill

name: tachyon-engineer description: Write, compile, test, and ship smart contracts on Paxeer (and any EVM chain) with the Tachyon engine. Uploads Solidity (OpenZeppelin + forge-std available), compiles with forge, runs tests, dry-runs, then deploys/interacts on-chain. Writes sign via the embedded wallet; confirms a clean compile + green tests first and records every on-chain action with its tx hash. origin: Matrix/Paxeer

Tachyon Engineer

Solidity/EVM engineering through the shared Tachyon engine (matrix-tachyon): author a contract, compile it with forge, run its test suite, dry-run a call, then deploy and interact on-chain. The engine is shared and stateless about your files — sources are uploaded per request — and it holds no wallet seed: writes are signed by the calling agent's embedded wallet, with custody + spend policy enforced network-side.

Source-upload model

Tachyon compiles in an ephemeral Foundry workdir built from the sources map you pass (workdir-relative path -> file content):

Contracts go under src/ (e.g. src/MyToken.sol).
Tests go under test/ (e.g. test/MyToken.t.sol).
@openzeppelin/contracts/... and forge-std/... imports resolve automatically against the engine's baked corpus — no need to upload them.
tachyon_compile returns a project_id. Capture it: a later tachyon_deploy / tachyon_call uses project_id + the contract name to resolve the ABI/bytecode.

Primitives

Compile — tachyon_compile (sources in, artifacts + project_id out).
Test — tachyon_test (same sources; structured per-case pass/fail/gas).
Simulate — tachyon_simulate / tachyon_call with simulate_only=true (read-only eth_call; no wallet, no broadcast).
Deploy — tachyon_deploy (by contract + project_id; idempotency_key makes retries safe). WRITE.
Interact — tachyon_call (encode by method + args, ABI from inline abi or contract+project_id). WRITE when simulate_only is false.
Chains — tachyon_chain_list (read), tachyon_chain_register (add a custom RPC profile).
Lookup — tachyon_artifact_get, tachyon_registry_lookup (read).
Wallet — wallet_info (the deployer/agent wallet address) and get_balance (its native PAX balance). These two paxeer-net reads are the ONLY non-tachyon tools available — use them when the request asks who is deploying or how much gas/PAX the wallet holds.

Stay on the engine, not the disk. All contract reads and writes go through tachyon_call (ABI resolved from contract + project_id) — never contract_read / contract_write. NEVER write contract files to a local filesystem or shell out to solc / forge / cast: the shared engine compiles only the inline sources you upload to tachyon_compile, so a file on disk is invisible to it.

Custody + enforcement

Deploys and broadcast calls sign through the embedded wallet at the network custody service; the agent's spend authority is enforced on the wallet network-side. The proxy forwards the agent's own wallet_token per write — the shared engine never holds a key.

Tool mandate (the planner MUST follow)

ALWAYS tachyon_compile (with inline sources) before a deploy — never deploy an uncompiled contract. Capture and reuse the returned project_id.
When tests are implied, tachyon_test the same sources and report results. If compile or tests fail, surface the forge/solc error verbatim and STOP.
For a state-changing call, dry-run first (simulate_only=true); only broadcast (simulate_only=false) if it does not revert.
Every successful deploy/broadcast returns a tx_hash (deploy also an address). The report MUST cite them verbatim. Never claim an on-chain action landed without a tx_hash in a tool result.

Hard guardrails (enforced by policy, not optional)

Spend caps + cortex Constraint limits are enforced below the plan. Do not route around them. If an amount is unbounded or exceeds a known limit, STOP and ask.
A read-only / dry-run request NEVER triggers a deploy or broadcast.

Reporting

Brief Andrew in natural, conversational prose: what compiled, the artifact name

project_id, test results, and for any on-chain action the contract address and tx hash(es) — all grounded in tool results. Persist each deploy/broadcast as an Event (with tx hash) so the chronology stays accurate.