## Build, Runtime, and RPC

Configuration shared by build commands and EVM execution. All fields belong under
`[profile.<name>]` unless a table is shown explicitly.

### Build and project fields

| Field | Type | Default | Description |
| --- | --- | --- | --- |
| `dynamic_test_linking` | boolean | `false` | Dynamically links test contracts. |
| `snapshots` | path | `snapshots` | Directory used for gas snapshot files. |
| `gas_snapshot_check` | boolean | `false` | Checks generated snapshots against stored snapshots. |
| `gas_snapshot_emit` | boolean | `true` | Writes gas snapshots to disk. |
| `skip` | array of globs | `[]` | Skips matching source paths during build and execution. |
| `test_failures_file` | path | `cache/test-failures` | Stores the last failed tests for reruns. |
| `no_match_coverage` | regular expression or none | none | Excludes matching source paths from coverage reports. |
| `gas_reports_ignore` | array of strings | `[]` | Excludes matching contracts from gas reports. |
| `gas_reports_include_tests` | boolean | `false` | Includes test contracts in gas reports. |
| `build_info` | boolean | `false` | Emits build-info files containing compiler input and output. |
| `build_info_path` | path or none | none | Overrides the build-info output directory. |
| `names` | boolean | `false` | Prints compiled contract names. |
| `sizes` | boolean | `false` | Prints compiled contract sizes. |

### Compiler and diagnostic fields

| Field | Type | Default | Description |
| --- | --- | --- | --- |
| `ast` | boolean | `false` | Includes the AST in compiler output. |
| `cbor_metadata` | boolean | `true` | Appends CBOR metadata to bytecode. |
| `via_ssa_cfg` | boolean | `false` | Enables Solidity's experimental SSA CFG pipeline and implies `via_ir`. |
| `experimental` | boolean | `false` | Passes Solidity's experimental-mode option to the compiler. |
| `extra_args` | array of strings | `[]` | Passes additional arguments to the `solc` binary. |
| `ignored_error_codes_from` | array | `[]` | Silences selected compiler diagnostics for specific path prefixes. |
| `deny` | `never`, `warnings`, or `notes` | `never` | Selects the minimum diagnostic level that makes a command fail. |

`ignored_error_codes_from` is an array of path-and-code pairs:

```toml
ignored_error_codes_from = [
  ["src/generated", [1878, 5574]],
]
```

### EVM execution fields

| Field | Type | Default | Description |
| --- | --- | --- | --- |
| `fork_block_number` | integer or none | none | Pins the block used for a fork. |
| `code_size_limit` | integer or none | none | Overrides the EIP-170 deployed-code size limit. |
| `block_prevrandao` | bytes32 | zero | Sets `block.prevrandao` (`mix_hash` before the Merge). |
| `block_gas_limit` | integer or none | none | Sets `block.gaslimit`; distinct from the per-call `gas_limit`. |
| `isolate` | boolean | `true` | Executes each top-level call in a separate EVM transaction context. |
| `disable_block_gas_limit` | boolean | `false` | Disables block gas-limit checks. |
| `enable_tx_gas_limit` | boolean | `false` | Enables the Osaka transaction gas-limit check from EIP-7825. |
| `live_logs` | boolean | `false` | Displays `console.log` output while tests or scripts execute. |
| `allow_internal_expect_revert` | boolean | `false` | Allows `expectRevert` to match internal calls. |
| `always_use_create_2_factory` | boolean | `false` | Uses the CREATE2 factory in tests and non-broadcast scripts. |
| `eip1559_fee_estimate` | string | `market` | Selects `low`, `market`, or `aggressive` script fee estimation. |
| `assertions_revert` | boolean | `true` | Makes native cheatcode assertions revert. |
| `legacy_assertions` | boolean | `false` | Uses the legacy `failed()` assertion check. |
| `unchecked_cheatcode_artifacts` | boolean | `false` | Disables artifact freshness checks for `vm.getCode` and `vm.getDeployedCode`. |
| `create2_library_salt` | bytes32 | zero | Sets the CREATE2 salt used for library deployment. |
| `create2_deployer` | address | `0x4e59…956c` | Sets the CREATE2 deployer address. |
| `transaction_timeout` | integer | `120` | Sets the transaction timeout in seconds. |
| `script_execution_protection` | boolean | `true` | Prevents unsafe script execution. |

### File-system permissions

`fs_permissions` controls which paths file cheatcodes may access. Each entry has
an `access` value (`read`, `write`, `read-write`, or `none`) and a path:

```toml
fs_permissions = [
  { access = "read", path = "out" },
  { access = "read-write", path = "./tmp" },
]
```

### RPC fields

| Field | Type | Default | Description |
| --- | --- | --- | --- |
| `eth_rpc_accept_invalid_certs` | boolean | `false` | Accepts invalid TLS certificates. |
| `eth_rpc_no_proxy` | boolean | `false` | Disables system and environment proxy detection. |
| `eth_rpc_jwt` | string or none | none | Supplies a JWT secret for RPC authentication. |
| `eth_rpc_timeout` | integer or none | none | Sets the RPC timeout in seconds. |
| `eth_rpc_headers` | array of strings or none | none | Adds `name:value` headers to RPC requests. |
| `eth_rpc_curl` | boolean | `false` | Prints an equivalent cURL command instead of sending the request. |
| `no_rpc_rate_limit` | boolean | `false` | Disables provider rate limiting. |

Named endpoints under `[rpc_endpoints]` accept either a URL string or an object.
Objects support `endpoint` (or an `endpoints` array), `auth`, `retries`,
`retry_backoff`, and `compute_units_per_second`:

```toml
[rpc_endpoints]
mainnet = { endpoints = ["${MAINNET_RPC_URL}", "${FALLBACK_RPC_URL}"], retries = 5, retry_backoff = 1000, compute_units_per_second = 330 }
```

`[rpc_storage_caching]` supports `chains` (`"all"`, `"none"`, or an array of
chains) and `endpoints` (`"all"`, `"remote"`, or a regular expression).