LetCode

Build and run

cargo build
cargo test
cargo fmt --check

cargo run

cargo run -- --cli

letcode --version
letcode update check

letcode update

External dependencies

Configuration

~/.config/letcode/letcode.toml

# Optional; defaults to the first provider in the file.
active_provider = "openai"
# Optional; defaults to false.
fast_mode = false
# Optional; all values below have defaults.
[global]
# max_iterations = 64
# max_tool_calls = 128
# tool_timeout_secs = 60
sessions_dir = "sessions"
log_file = "logs/combined.log"
# Optional; by default, recent context is preserved according to the active model's input budget.
[global.compaction]
# preserve_recent_tokens = 12000
# Optional; values below are the defaults.
[global.retry]
enabled = true
max_attempts = 50
max_recovery_attempts = 3
initial_delay_secs = 1
backoff_multiplier = 2.0
jitter_secs = 1
# Optional; defaults to default. Values: safe | default | auto | yolo.
[permissions]
mode = "default" # solo remains accepted as a yolo alias
# Optional; choose a default route and per-invocation allowed routes for an expert.
# [agents.explorer]
# provider = "openai"
# model = "gpt-5.5"
# allowed_models = ["openai/gpt-5.5"]
# The same shape applies to fixer, oracle, designer, librarian, general, and reviewer.
# Optional; this can only narrow parallelism declared by a tool itself.
[tools.parallelism]
# "fs__read" = "parallel"
# "web__fetch" = "exclusive"
# Optional local MCP server.
# [mcp.example_local]
# type = "local"
# command = ["/path/to/mcp-server", "--stdio"]
# environment = { FOO = "bar" }
# enabled = true
# timeout = 5000
# Optional remote MCP server; OAuth is not currently supported.
# [mcp.example_remote]
# type = "remote"
# url = "https://example.com/mcp"
# headers = { Authorization = "Bearer ..." }
# enabled = true
# timeout = 10000
# Required: configure at least one provider with at least one model.
[providers.openai]
protocol = "responses" # responses | completions | anthropic
flavor = "standard" # standard | deepseek
# Required; must reference a model configured for this provider.
default_model = "gpt-5.5"
[providers.openai.auth]
type = "bearer" # bearer | header | query | none
credential_env = "OPENAI_API_KEY"
# credential = "YOUR_API_KEY" # use this instead of credential_env when appropriate
[providers.openai.endpoints]
base_url = "https://api.openai.com/v1"
[providers.openai.endpoints.responses]
path = "responses"
# Optional provider connection settings.
# [providers.openai.transport]
# connect_timeout_secs = 10
# no_proxy_loopback = true
# Required: each provider needs at least one model; every field inside the model is optional.
[providers.openai.models."gpt-5.5"]
display = "GPT-5.5"
# protocol = "completions" # overrides the provider protocol
# flavor = "standard" # overrides the provider flavor; deepseek selects the explicit DeepSeek profile
# context_window = 400000
# effective_input_limit_tokens = 256000
# Optional model transport; defaults to HTTP/SSE. Set websocket = true for normal Agent
# turns using Responses on a WebSocket-capable endpoint. Title generation and compaction
# one-shot requests remain on HTTP/SSE.
[providers.openai.models."gpt-5.5".transport]
websocket = false
# Capability flags default to false when omitted.
[providers.openai.models."gpt-5.5".capabilities]
tools = true
parallel_tool_calls = true
reasoning = true
input_images = false
tool_result_images = false
prompt_cache = false
priority_service = false
[providers.openai.models."gpt-5.5".capabilities.generation]
temperature = true
top_p = true
max_output_tokens = true
reasoning = true
reasoning_summary = true
text_verbosity = true
parallel_tool_calls = true
[providers.openai.models."gpt-5.5".generation]
temperature = 0.2
top_p = 1.0
max_output_tokens = 128000
reasoning_effort = "medium"
# Optional; restricts selectable reasoning levels and the TUI cycle order.
reasoning_efforts = ["none", "low", "medium", "high", "max"]
reasoning_summary = "auto" # auto | concise | detailed
text_verbosity = "medium" # low | medium | high
parallel_tool_calls = true
[providers.openai.models."gpt-5.5".cache]
enabled = false
# retention = "in_memory" # in_memory | 24h; set when cache is enabled
# namespace = "openai"
# Adapter-specific settings are validated by the selected protocol binding.
# Anthropic routes may set, for example:
# anthropic_thinking = { mode = "adaptive" }
# anthropic_betas = ["context-1m-2025年08月07日"]
[providers.openai.models."gpt-5.5".protocol_settings]

Changelog

License