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- Implemented unit tests for the Tokenizer class, covering various text inputs, edge cases, and fallback mechanisms. - Created performance benchmarks comparing tiktoken and pure Python implementations for token counting. - Developed extensive tests for TreeSitterSymbolParser across Python, JavaScript, and TypeScript, ensuring accurate symbol extraction and parsing. - Added configuration documentation for MCP integration and custom prompts, enhancing usability and flexibility. - Introduced a refactor script for GraphAnalyzer to streamline future improvements.
459 lines
18 KiB
Markdown
459 lines
18 KiB
Markdown
MCP integration
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mcp_servers
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You can configure Codex to use MCP servers to give Codex access to external applications, resources, or services.
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Server configuration
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STDIO
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STDIO servers are MCP servers that you can launch directly via commands on your computer.
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# The top-level table name must be `mcp_servers`
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# The sub-table name (`server-name` in this example) can be anything you would like.
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[mcp_servers.server_name]
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command = "npx"
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# Optional
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args = ["-y", "mcp-server"]
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# Optional: propagate additional env vars to the MCP server.
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# A default whitelist of env vars will be propagated to the MCP server.
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# https://github.com/openai/codex/blob/main/codex-rs/rmcp-client/src/utils.rs#L82
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env = { "API_KEY" = "value" }
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# or
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[mcp_servers.server_name.env]
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API_KEY = "value"
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# Optional: Additional list of environment variables that will be whitelisted in the MCP server's environment.
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env_vars = ["API_KEY2"]
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# Optional: cwd that the command will be run from
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cwd = "/Users/<user>/code/my-server"
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Streamable HTTP
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Streamable HTTP servers enable Codex to talk to resources that are accessed via a http url (either on localhost or another domain).
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[mcp_servers.figma]
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url = "https://mcp.figma.com/mcp"
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# Optional environment variable containing a bearer token to use for auth
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bearer_token_env_var = "ENV_VAR"
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# Optional map of headers with hard-coded values.
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http_headers = { "HEADER_NAME" = "HEADER_VALUE" }
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# Optional map of headers whose values will be replaced with the environment variable.
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env_http_headers = { "HEADER_NAME" = "ENV_VAR" }
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Streamable HTTP connections always use the experimental Rust MCP client under the hood, so expect occasional rough edges. OAuth login flows are gated on the rmcp_client = true flag:
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[features]
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rmcp_client = true
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After enabling it, run codex mcp login <server-name> when the server supports OAuth.
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Other configuration options
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# Optional: override the default 10s startup timeout
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startup_timeout_sec = 20
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# Optional: override the default 60s per-tool timeout
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tool_timeout_sec = 30
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# Optional: disable a server without removing it
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enabled = false
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# Optional: only expose a subset of tools from this server
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enabled_tools = ["search", "summarize"]
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# Optional: hide specific tools (applied after `enabled_tools`, if set)
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disabled_tools = ["search"]
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When both enabled_tools and disabled_tools are specified, Codex first restricts the server to the allow-list and then removes any tools that appear in the deny-list.
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MCP CLI commands
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# List all available commands
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codex mcp --help
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# Add a server (env can be repeated; `--` separates the launcher command)
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codex mcp add docs -- docs-server --port 4000
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# List configured servers (pretty table or JSON)
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codex mcp list
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codex mcp list --json
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# Show one server (table or JSON)
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codex mcp get docs
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codex mcp get docs --json
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# Remove a server
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codex mcp remove docs
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# Log in to a streamable HTTP server that supports oauth
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codex mcp login SERVER_NAME
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# Log out from a streamable HTTP server that supports oauth
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codex mcp logout SERVER_NAME
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Examples of useful MCPs
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There is an ever growing list of useful MCP servers that can be helpful while you are working with Codex.
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Some of the most common MCPs we've seen are:
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Context7 — connect to a wide range of up-to-date developer documentation
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Figma Local and Remote - access to your Figma designs
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Playwright - control and inspect a browser using Playwright
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Chrome Developer Tools — control and inspect a Chrome browser
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Sentry — access to your Sentry logs
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GitHub — Control over your GitHub account beyond what git allows (like controlling PRs, issues, etc.)
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# Example config.toml
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Use this example configuration as a starting point. For an explanation of each field and additional context, see [Configuration](./config.md). Copy the snippet below to `~/.codex/config.toml` and adjust values as needed.
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```toml
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# Codex example configuration (config.toml)
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#
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# This file lists all keys Codex reads from config.toml, their default values,
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# and concise explanations. Values here mirror the effective defaults compiled
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# into the CLI. Adjust as needed.
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#
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# Notes
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# - Root keys must appear before tables in TOML.
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# - Optional keys that default to "unset" are shown commented out with notes.
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# - MCP servers, profiles, and model providers are examples; remove or edit.
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################################################################################
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# Core Model Selection
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################################################################################
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# Primary model used by Codex. Default: "gpt-5.1-codex-max" on all platforms.
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model = "gpt-5.1-codex-max"
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# Model used by the /review feature (code reviews). Default: "gpt-5.1-codex-max".
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review_model = "gpt-5.1-codex-max"
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# Provider id selected from [model_providers]. Default: "openai".
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model_provider = "openai"
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# Optional manual model metadata. When unset, Codex auto-detects from model.
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# Uncomment to force values.
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# model_context_window = 128000 # tokens; default: auto for model
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# model_auto_compact_token_limit = 0 # disable/override auto; default: model family specific
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# tool_output_token_limit = 10000 # tokens stored per tool output; default: 10000 for gpt-5.1-codex-max
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################################################################################
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# Reasoning & Verbosity (Responses API capable models)
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################################################################################
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# Reasoning effort: minimal | low | medium | high | xhigh (default: medium; xhigh on gpt-5.1-codex-max and gpt-5.2)
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model_reasoning_effort = "medium"
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# Reasoning summary: auto | concise | detailed | none (default: auto)
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model_reasoning_summary = "auto"
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# Text verbosity for GPT-5 family (Responses API): low | medium | high (default: medium)
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model_verbosity = "medium"
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# Force-enable reasoning summaries for current model (default: false)
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model_supports_reasoning_summaries = false
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# Force reasoning summary format: none | experimental (default: none)
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model_reasoning_summary_format = "none"
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################################################################################
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# Instruction Overrides
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################################################################################
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# Additional user instructions appended after AGENTS.md. Default: unset.
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# developer_instructions = ""
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# Optional legacy base instructions override (prefer AGENTS.md). Default: unset.
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# instructions = ""
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# Inline override for the history compaction prompt. Default: unset.
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# compact_prompt = ""
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# Override built-in base instructions with a file path. Default: unset.
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# experimental_instructions_file = "/absolute/or/relative/path/to/instructions.txt"
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# Load the compact prompt override from a file. Default: unset.
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# experimental_compact_prompt_file = "/absolute/or/relative/path/to/compact_prompt.txt"
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################################################################################
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# Approval & Sandbox
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################################################################################
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# When to ask for command approval:
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# - untrusted: only known-safe read-only commands auto-run; others prompt
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# - on-failure: auto-run in sandbox; prompt only on failure for escalation
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# - on-request: model decides when to ask (default)
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# - never: never prompt (risky)
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approval_policy = "on-request"
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# Filesystem/network sandbox policy for tool calls:
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# - read-only (default)
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# - workspace-write
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# - danger-full-access (no sandbox; extremely risky)
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sandbox_mode = "read-only"
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# Extra settings used only when sandbox_mode = "workspace-write".
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[sandbox_workspace_write]
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# Additional writable roots beyond the workspace (cwd). Default: []
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writable_roots = []
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# Allow outbound network access inside the sandbox. Default: false
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network_access = false
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# Exclude $TMPDIR from writable roots. Default: false
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exclude_tmpdir_env_var = false
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# Exclude /tmp from writable roots. Default: false
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exclude_slash_tmp = false
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################################################################################
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# Shell Environment Policy for spawned processes
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################################################################################
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[shell_environment_policy]
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# inherit: all (default) | core | none
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inherit = "all"
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# Skip default excludes for names containing KEY/TOKEN (case-insensitive). Default: false
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ignore_default_excludes = false
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# Case-insensitive glob patterns to remove (e.g., "AWS_*", "AZURE_*"). Default: []
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exclude = []
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# Explicit key/value overrides (always win). Default: {}
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set = {}
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# Whitelist; if non-empty, keep only matching vars. Default: []
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include_only = []
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# Experimental: run via user shell profile. Default: false
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experimental_use_profile = false
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################################################################################
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# History & File Opener
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################################################################################
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[history]
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# save-all (default) | none
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persistence = "save-all"
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# Maximum bytes for history file; oldest entries are trimmed when exceeded. Example: 5242880
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# max_bytes = 0
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# URI scheme for clickable citations: vscode (default) | vscode-insiders | windsurf | cursor | none
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file_opener = "vscode"
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################################################################################
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# UI, Notifications, and Misc
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################################################################################
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[tui]
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# Desktop notifications from the TUI: boolean or filtered list. Default: true
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# Examples: false | ["agent-turn-complete", "approval-requested"]
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notifications = false
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# Enables welcome/status/spinner animations. Default: true
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animations = true
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# Suppress internal reasoning events from output. Default: false
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hide_agent_reasoning = false
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# Show raw reasoning content when available. Default: false
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show_raw_agent_reasoning = false
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# Disable burst-paste detection in the TUI. Default: false
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disable_paste_burst = false
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# Track Windows onboarding acknowledgement (Windows only). Default: false
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windows_wsl_setup_acknowledged = false
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# External notifier program (argv array). When unset: disabled.
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# Example: notify = ["notify-send", "Codex"]
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# notify = [ ]
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# In-product notices (mostly set automatically by Codex).
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[notice]
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# hide_full_access_warning = true
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# hide_rate_limit_model_nudge = true
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################################################################################
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# Authentication & Login
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################################################################################
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# Where to persist CLI login credentials: file (default) | keyring | auto
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cli_auth_credentials_store = "file"
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# Base URL for ChatGPT auth flow (not OpenAI API). Default:
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chatgpt_base_url = "https://chatgpt.com/backend-api/"
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# Restrict ChatGPT login to a specific workspace id. Default: unset.
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# forced_chatgpt_workspace_id = ""
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# Force login mechanism when Codex would normally auto-select. Default: unset.
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# Allowed values: chatgpt | api
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# forced_login_method = "chatgpt"
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# Preferred store for MCP OAuth credentials: auto (default) | file | keyring
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mcp_oauth_credentials_store = "auto"
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################################################################################
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# Project Documentation Controls
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################################################################################
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# Max bytes from AGENTS.md to embed into first-turn instructions. Default: 32768
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project_doc_max_bytes = 32768
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# Ordered fallbacks when AGENTS.md is missing at a directory level. Default: []
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project_doc_fallback_filenames = []
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################################################################################
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# Tools (legacy toggles kept for compatibility)
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################################################################################
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[tools]
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# Enable web search tool (alias: web_search_request). Default: false
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web_search = false
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# Enable the view_image tool so the agent can attach local images. Default: true
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view_image = true
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# (Alias accepted) You can also write:
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# web_search_request = false
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################################################################################
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# Centralized Feature Flags (preferred)
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################################################################################
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[features]
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# Leave this table empty to accept defaults. Set explicit booleans to opt in/out.
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unified_exec = false
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rmcp_client = false
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apply_patch_freeform = false
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view_image_tool = true
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web_search_request = false
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ghost_commit = false
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enable_experimental_windows_sandbox = false
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skills = false
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################################################################################
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# Experimental toggles (legacy; prefer [features])
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################################################################################
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# Include apply_patch via freeform editing path (affects default tool set). Default: false
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experimental_use_freeform_apply_patch = false
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# Define MCP servers under this table. Leave empty to disable.
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[mcp_servers]
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# --- Example: STDIO transport ---
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# [mcp_servers.docs]
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# command = "docs-server" # required
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# args = ["--port", "4000"] # optional
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# env = { "API_KEY" = "value" } # optional key/value pairs copied as-is
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# env_vars = ["ANOTHER_SECRET"] # optional: forward these from the parent env
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# cwd = "/path/to/server" # optional working directory override
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# startup_timeout_sec = 10.0 # optional; default 10.0 seconds
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# # startup_timeout_ms = 10000 # optional alias for startup timeout (milliseconds)
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# tool_timeout_sec = 60.0 # optional; default 60.0 seconds
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# enabled_tools = ["search", "summarize"] # optional allow-list
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# disabled_tools = ["slow-tool"] # optional deny-list (applied after allow-list)
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# --- Example: Streamable HTTP transport ---
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# [mcp_servers.github]
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# url = "https://github-mcp.example.com/mcp" # required
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# bearer_token_env_var = "GITHUB_TOKEN" # optional; Authorization: Bearer <token>
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# http_headers = { "X-Example" = "value" } # optional static headers
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# env_http_headers = { "X-Auth" = "AUTH_ENV" } # optional headers populated from env vars
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# startup_timeout_sec = 10.0 # optional
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# tool_timeout_sec = 60.0 # optional
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# enabled_tools = ["list_issues"] # optional allow-list
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################################################################################
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# Model Providers (extend/override built-ins)
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################################################################################
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# Built-ins include:
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# - openai (Responses API; requires login or OPENAI_API_KEY via auth flow)
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# - oss (Chat Completions API; defaults to http://localhost:11434/v1)
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[model_providers]
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# --- Example: override OpenAI with explicit base URL or headers ---
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# [model_providers.openai]
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# name = "OpenAI"
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# base_url = "https://api.openai.com/v1" # default if unset
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# wire_api = "responses" # "responses" | "chat" (default varies)
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# # requires_openai_auth = true # built-in OpenAI defaults to true
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# # request_max_retries = 4 # default 4; max 100
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# # stream_max_retries = 5 # default 5; max 100
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# # stream_idle_timeout_ms = 300000 # default 300_000 (5m)
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# # experimental_bearer_token = "sk-example" # optional dev-only direct bearer token
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# # http_headers = { "X-Example" = "value" }
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# # env_http_headers = { "OpenAI-Organization" = "OPENAI_ORGANIZATION", "OpenAI-Project" = "OPENAI_PROJECT" }
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# --- Example: Azure (Chat/Responses depending on endpoint) ---
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# [model_providers.azure]
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# name = "Azure"
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# base_url = "https://YOUR_PROJECT_NAME.openai.azure.com/openai"
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# wire_api = "responses" # or "chat" per endpoint
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# query_params = { api-version = "2025-04-01-preview" }
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# env_key = "AZURE_OPENAI_API_KEY"
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# # env_key_instructions = "Set AZURE_OPENAI_API_KEY in your environment"
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# --- Example: Local OSS (e.g., Ollama-compatible) ---
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# [model_providers.ollama]
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# name = "Ollama"
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# base_url = "http://localhost:11434/v1"
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# wire_api = "chat"
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################################################################################
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# Profiles (named presets)
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################################################################################
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# Active profile name. When unset, no profile is applied.
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# profile = "default"
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[profiles]
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# [profiles.default]
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# model = "gpt-5.1-codex-max"
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# model_provider = "openai"
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# approval_policy = "on-request"
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# sandbox_mode = "read-only"
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# model_reasoning_effort = "medium"
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# model_reasoning_summary = "auto"
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# model_verbosity = "medium"
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# chatgpt_base_url = "https://chatgpt.com/backend-api/"
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# experimental_compact_prompt_file = "compact_prompt.txt"
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# include_apply_patch_tool = false
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# experimental_use_freeform_apply_patch = false
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# tools_web_search = false
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# tools_view_image = true
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# features = { unified_exec = false }
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################################################################################
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# Projects (trust levels)
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################################################################################
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# Mark specific worktrees as trusted. Only "trusted" is recognized.
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[projects]
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# [projects."/absolute/path/to/project"]
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# trust_level = "trusted"
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################################################################################
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# OpenTelemetry (OTEL) – disabled by default
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################################################################################
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[otel]
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# Include user prompt text in logs. Default: false
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log_user_prompt = false
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# Environment label applied to telemetry. Default: "dev"
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environment = "dev"
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# Exporter: none (default) | otlp-http | otlp-grpc
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exporter = "none"
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# Example OTLP/HTTP exporter configuration
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# [otel.exporter."otlp-http"]
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# endpoint = "https://otel.example.com/v1/logs"
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# protocol = "binary" # "binary" | "json"
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# [otel.exporter."otlp-http".headers]
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# "x-otlp-api-key" = "${OTLP_TOKEN}"
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# Example OTLP/gRPC exporter configuration
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# [otel.exporter."otlp-grpc"]
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# endpoint = "https://otel.example.com:4317",
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# headers = { "x-otlp-meta" = "abc123" }
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# Example OTLP exporter with mutual TLS
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# [otel.exporter."otlp-http"]
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# endpoint = "https://otel.example.com/v1/logs"
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# protocol = "binary"
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# [otel.exporter."otlp-http".headers]
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# "x-otlp-api-key" = "${OTLP_TOKEN}"
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# [otel.exporter."otlp-http".tls]
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# ca-certificate = "certs/otel-ca.pem"
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# client-certificate = "/etc/codex/certs/client.pem"
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# client-private-key = "/etc/codex/certs/client-key.pem"
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``` |