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Anthropic Provider

Minimal Setup

export SIGIL_ANTHROPIC_API_KEY="sk-ant-..."
sigil

config_version = 2

[agent]
connection = "anthropic-default"
model = "claude-sonnet-4-5"

[connections.anthropic-default]
label = "Anthropic"
provider = "anthropic"
protocol = "anthropic_messages"
base_url = "https://api.anthropic.com"
credential = { source = "environment", name = "SIGIL_ANTHROPIC_API_KEY" }

[connections.anthropic-default.options]
anthropic_version = "2023-06-01"
max_tokens = 4096

See anthropic.toml for a copyable file.

Authentication

The example binds this connection to SIGIL_ANTHROPIC_API_KEY. Setup and /config can save the secret to the protected credential store instead; sigil.toml then contains only an opaque stored ID. The default file mode uses the owner-only credential file without system authentication prompts.

Options And Visible Limits

anthropic_version, max_tokens, and beta_headers are provider-owned fields under [connections.anthropic-default.options]. Use beta_headers only when a known Anthropic feature requires them.

Images work only with recognized Claude model IDs and accepted dated variants. Unknown names and aliases are rejected before sending.

Verify

Run sigil doctor and confirm default=anthropic-default/claude-sonnet-4-5, endpoint, credential source, and readiness.

Common Problems

Version/header rejection: check anthropic_version and beta_headers.
Output stops early: review max_tokens and model limits.
Authentication: check the bound environment variable or repair this connection in /config.
Tool behavior differs: confirm the selected Claude model supports tool use.

Next: Return to Providers.