> ## Documentation Index > Fetch the complete documentation index at: https://phaseo.app/docs/llms.txt > Use this file to discover all available pages before exploring further. > ## Agent Instructions > Phaseo Gateway base URL: https://api.phaseo.app/v1. Send `Authorization: Bearer $PHASEO_API_KEY` with every request. > Model IDs look like `provider/model`, for example `openai/gpt-6-astra`. Do not guess IDs: list them with `GET /v1/models` or check https://phaseo.app/models. `phaseo/free` routes to an available free model and needs no wallet balance. > For new text integrations prefer `POST /v1/responses`. `POST /v1/chat/completions` (OpenAI format) and `POST /v1/messages` (Anthropic format) suit existing code. > The full API contract is https://phaseo.app/docs/openapi/v1/openapi.yaml. Official SDKs: `@phaseo/sdk` (TypeScript) and `phaseo` (Python), plus Go, C#, PHP, Ruby and Rust. > Search these docs over MCP at https://phaseo.app/docs/mcp, and install Phaseo skills with `npx skills add https://phaseo.app/docs`. If a page is wrong or out of date, report it with the MCP `submit_feedback` tool. > Manage Phaseo accounts with the `phaseo` CLI (`npm install -g @phaseo/cli`, then `phaseo login` or `phaseo login --device-code`), the `/v1` Management API or the MCP server at `https://mcp.phaseo.app/mcp?access=manage`. Do not send users to the dashboard for account tasks. A person is still needed for sign-up, approving a sign-in, paying the first top-up on the checkout link that `phaseo credits add` returns when no card is saved, confirming each saved-card top-up from the emailed link, and account security (password, MFA, passkeys). Create API keys with `phaseo keys create --name --json`; never guess one. Credit top-ups need `phaseo login --scopes billing:write` first. Task map: https://phaseo.app/docs/v1/developers/manage-from-an-agent.md. # Create a message > Anthropic-compatible Messages endpoint at /v1/messages. `/v1/messages` accepts Anthropic Messages API payloads and returns Anthropic-formatted responses. ## Streaming Set `stream: true` to receive server-sent events in Anthropic format (`message_start`, `content_block_*`, `message_delta`, `message_stop`). ## Mid-conversation system messages Add a `role: "system"` message to `messages` for an instruction that applies from that point in the conversation. The top-level `system` field stays the same, so a cached prefix still hits. ```bash theme={null} curl https://api.phaseo.app/v1/messages \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "anthropic/claude-opus-5.5", "max_tokens": 512, "system": "You are a code review assistant.", "messages": [ { "role": "user", "content": "Review process() in utils.py." }, { "role": "assistant", "content": "The loop is fine; the regex is compiled on every call." }, { "role": "user", "content": "Now review the code that calls it." }, { "role": "system", "content": "From now on, include type annotations in every suggestion." } ] }' ``` * A system message takes a string or text blocks. It must come straight after a user turn (or an assistant turn ending in a server tool result) and be the last message or be followed by an assistant turn. Other positions return a 400. * Claude Fable 5 and 5.1, Mythos 5 and 5.1, Opus 4.8, Opus 5 and 5.5, Sonnet 5.5 and Haiku 5.5 receive it in place. Other Claude models, including Sonnet 5, and every Claude model on Microsoft Foundry receive it as part of the top-level system prompt. Other providers receive it as a system message, the same as one sent to Chat Completions. * `clear_at`, `output_config`, and `tool_addition` or `tool_removal` blocks are not supported. ## Notes * Anthropic tool-use fields are supported. * `stream: true` also works with tool loops. For gateway-managed server tools, Phaseo may materialize the upstream tool-call turn, continue the loop, and re-emit a synthetic stream. * The Anthropic-native web search tool shape is also accepted directly in `tools`, for example `type: "web_search_20250305"`. * The `X-Phaseo-Strictness` header controls how unsupported parameters are handled. ## Server tools `/v1/messages` also supports these gateway-managed server tools: * `gateway:datetime` * `phaseo:web_search` * `phaseo:web_fetch` * `phaseo:advisor` * `phaseo:image_generation` Phaseo rewrites these tools to Anthropic-compatible format upstream, executes them server-side, and continues the tool loop. ## Native provider web search When a compatible Anthropic model/provider pair supports native web search, you can also pass the native tool definition through directly: ```bash theme={null} curl https://api.phaseo.app/v1/messages \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "anthropic/claude-sonnet-4", "max_tokens": 512, "messages": [ { "role": "user", "content": "Find the latest Anthropic web search guidance." } ], "tools": [ { "type": "web_search_20250305", "name": "web_search", "max_uses": 3, "allowed_domains": ["docs.anthropic.com"] } ], "tool_choice": { "type": "tool", "name": "web_search" } }' ``` Provider routing still filters for `web_search_options` support before execution. ### Datetime example ```bash theme={null} curl https://api.phaseo.app/v1/messages \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "anthropic/claude-sonnet-4", "max_tokens": 512, "stream": false, "messages": [ { "role": "user", "content": "What time is it in America/New_York right now?" } ], "tools": [ { "type": "gateway:datetime", "parameters": { "timezone": "America/New_York" } } ], "tool_choice": { "type": "auto" } }' ``` When used, the `usage.server_tool_use.*` counters report server-tool invocations. ## OpenAPI ````yaml openapi/v1/openapi.yaml POST /messages openapi: 3.0.3 info: title: Phaseo Gateway API description: >- A gateway API for accessing various AI models with OpenAI-compatible endpoints. version: 1.0.0 contact: name: Phaseo url: https://phaseo.app email: danielbutler500@gmail.com servers: - url: https://api.phaseo.app/v1 description: Global routing security: - BearerAuth: [] tags: - name: Gateway description: Core Phaseo Gateway operations. paths: /messages: post: tags: - Gateway summary: Create message description: Creates a message using the Anthropic Messages API. operationId: createAnthropicMessage requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/AnthropicMessagesRequest' examples: datetimeServerTool: summary: Built-in datetime server tool value: model: anthropic/claude-sonnet-4 max_tokens: 512 stream: false messages: - role: user content: What time is it in America/New_York right now? tools: - type: gateway:datetime parameters: timezone: America/New_York tool_choice: type: auto responses: '200': description: Message response headers: x-request-id: $ref: '#/components/headers/PublicRequestId' X-Phaseo-Requested-Model: $ref: '#/components/headers/RequestedModel' X-Phaseo-Model-Substitution: $ref: '#/components/headers/ModelSubstitution' X-Phaseo-Dropped-Params: $ref: '#/components/headers/DroppedParams' X-Phaseo-Spend-Warning: $ref: '#/components/headers/SpendWarning' content: application/json: schema: $ref: '#/components/schemas/AnthropicMessagesResponse' text/event-stream: schema: type: string servers: - url: https://api.phaseo.app/v1 description: Global routing - url: https://eu.api.phaseo.app/v1 description: EU regional provider routing (text only) - url: https://us.api.phaseo.app/v1 description: US regional provider routing (text only) components: schemas: AnthropicMessagesRequest: type: object description: >- An optional top-level field sent as `null` is treated as unset, the same as leaving it out. required: - model - messages - max_tokens properties: model: type: string models: $ref: '#/components/schemas/ModelFallbacks' prompt: $ref: '#/components/schemas/PromptTemplateReference' system: oneOf: - type: string - type: array items: type: object properties: type: type: string enum: - text text: type: string cache_control: $ref: '#/components/schemas/CacheControl' messages: type: array minItems: 1 items: oneOf: - $ref: '#/components/schemas/AnthropicMessage' - $ref: '#/components/schemas/AnthropicSystemMessage' discriminator: propertyName: role mapping: user: '#/components/schemas/AnthropicMessage' assistant: '#/components/schemas/AnthropicMessage' system: '#/components/schemas/AnthropicSystemMessage' max_tokens: type: integer minimum: 1 service_tier: type: string description: Selects a supported routing or pricing tier on compatible text APIs. enum: - standard - default - fast - ultrafast - priority - flex - batch - auto - standard_only temperature: type: number minimum: 0 maximum: 1 top_p: type: number minimum: 0 maximum: 1 top_k: type: integer minimum: 1 tools: type: array description: | Anthropic-compatible tools plus gateway-managed server tools. items: oneOf: - $ref: '#/components/schemas/AnthropicTool' - $ref: '#/components/schemas/GatewayDatetimeToolDefinition' - $ref: '#/components/schemas/GatewayWebSearchToolDefinition' - $ref: '#/components/schemas/GatewayWebFetchToolDefinition' - $ref: '#/components/schemas/SubagentToolDefinition' - $ref: '#/components/schemas/FusionToolDefinition' - $ref: '#/components/schemas/SearchModelsToolDefinition' tool_choice: description: > Anthropic tool choice object/string. Gateway-managed server tool names are also accepted and rewritten by the gateway. oneOf: - type: object - type: string plugins: type: array description: > Gateway plugins for this request. `web` adds web search and `web-fetch` adds page fetching to any model; `response-healing` repairs malformed JSON in buffered structured-output responses. Workspace and preset defaults are merged with this list. An unknown plugin id returns 400 `unknown_gateway_plugin`. items: $ref: '#/components/schemas/GatewayPlugin' stream: type: boolean metadata: type: object additionalProperties: true session_id: type: string maxLength: 256 description: >- Unique identifier for grouping related requests (for example, a conversation or agent workflow) for observability. reasoning: $ref: '#/components/schemas/ReasoningConfig' context_management: type: object description: >- Anthropic context editing. `edits` takes `clear_tool_uses_*` and `clear_thinking_*` strategies and is sent to Anthropic with its beta header. Other providers run the request without it and list `context_management` in `X-Phaseo-Dropped-Params`. Compaction edits (`compact_*`) return 400. properties: edits: type: array items: type: object required: - type properties: type: type: string additionalProperties: true additionalProperties: true user: type: string description: >- End-user identifier, as on Chat Completions. Claude models receive it as `metadata.user_id` unless `metadata.user_id` is set. prompt_cache_key: type: string nullable: true description: >- Groups related requests so they stay on the provider that holds their prompt cache. Phaseo sends a hash of your workspace and this key upstream, never the raw key. stop_sequences: type: array items: type: string cache_control: $ref: '#/components/schemas/CacheControl' provider_options: $ref: '#/components/schemas/ProviderOptions' usage: type: boolean meta: type: boolean echo_upstream_request: type: boolean debug: $ref: '#/components/schemas/DebugOptions' provider: $ref: '#/components/schemas/ProviderRoutingOptions' AnthropicMessagesResponse: type: object properties: id: type: string type: type: string role: type: string enum: - assistant model: type: string content: type: array items: $ref: '#/components/schemas/AnthropicContentBlock' stop_reason: type: string stop_sequence: type: string usage: $ref: '#/components/schemas/AnthropicUsage' context_management: type: object description: >- Present when the request used `context_management` and Anthropic applied an edit. `applied_edits` lists each edit with what it cleared. Streams carry it on the final `message_delta` event. properties: applied_edits: type: array items: type: object additionalProperties: true ModelFallbacks: type: array minItems: 1 maxItems: 25 items: type: string minLength: 1 description: >- Optional ordered fallback models tried after `model`. `model` is required and is always the primary model. When an attempt fails with `429`, `500`, `502`, `503`, or `504`, the next entry is tried; other errors are returned unchanged. Accepts up to 25 model IDs or presets; duplicates and entries equal to `model` are ignored. Each attempt is validated, logged, and billed as its own request, and the response `model` field and routing trace show the model that served the request. Streaming requests fall back only before the first byte, and video and music jobs fall back only at submission. Batch, realtime, and council requests reject `models`. Fallbacks set on a dynamic route take precedence, and `phaseo/auto` cannot be combined with `models`. example: - anthropic/claude-sonnet-5-5 - google/gemini-2.5-flash PromptTemplateReference: type: object description: >- Fills in the prompt template saved on a preset. Leave out model or set it to the same reference, and send an empty conversation or the turns to add after the template. required: - id properties: id: type: string description: >- Preset reference starting with @, such as @support-triage or @publisher/support-triage. variables: type: object additionalProperties: true description: >- Values for the template variables. Image variables take an https URL, a data URL or an image part. version: type: string maxLength: 64 description: >- Runs this published version of the preset instead of the current one: its models, parameters and template. Use a version label such as v3, 1.2.0 or 2026.10.27, or a label such as production. The same as setting model to @support-triage@production. CacheControl: type: object description: >- Prompt cache control. Use type ephemeral with an optional ttl of 5m or 1h. scope applies only to a top-level Claude cache policy. Amazon Bedrock and Google Vertex AI cache Claude 3.7 Sonnet, 3.5 Sonnet and 3 Opus for 5 minutes only; there the ttl is removed and a removed 1h is reported in X-Phaseo-Dropped-Params as cache_control.ttl. properties: type: type: string ttl: type: string scope: type: string additionalProperties: true AnthropicMessage: type: object required: - role - content properties: role: type: string enum: - user - assistant content: oneOf: - type: string - type: array items: $ref: '#/components/schemas/AnthropicContentBlock' AnthropicSystemMessage: type: object required: - role - content properties: role: type: string description: >- Use `system` for an instruction that applies from this point in the conversation. A system message takes a string or text blocks, must come straight after a user turn (or an assistant turn ending in a server tool result), and must be the last message or be followed by an assistant turn. enum: - system content: oneOf: - type: string - type: array minItems: 1 items: $ref: '#/components/schemas/AnthropicSystemTextBlock' additionalProperties: false AnthropicTool: type: object required: - name properties: name: type: string async: type: boolean description: >- Lets supported OpenAI models continue while the caller executes this tool. Ignored when routed to other providers. description: type: string input_schema: type: object GatewayDatetimeToolDefinition: type: object description: > Gateway-managed server tool. The gateway executes the datetime lookup and injects the result back into the model tool loop. required: - type properties: type: type: string enum: - phaseo:datetime - gateway:datetime parameters: type: object properties: timezone: type: string description: IANA timezone name (for example Europe/London). additionalProperties: false timezone: type: string description: Legacy shortcut for default timezone (IANA). additionalProperties: false GatewayWebSearchToolDefinition: type: object description: > Gateway-managed server tool. The gateway executes a web search and injects normalized search results back into the model tool loop. required: - type properties: type: type: string enum: - phaseo:web_search - gateway:web_search parameters: type: object properties: engine: type: string enum: - auto - native - exa - firecrawl - parallel - perplexity - tinyfish max_results: type: integer minimum: 1 maximum: 25 language: type: string page: type: integer minimum: 0 maximum: 10 include_text: type: boolean include_highlights: type: boolean additionalProperties: false max_results: type: integer minimum: 1 maximum: 25 engine: type: string enum: - auto - native - exa - firecrawl - parallel - perplexity - tinyfish language: type: string page: type: integer minimum: 0 maximum: 10 include_text: type: boolean include_highlights: type: boolean additionalProperties: false GatewayWebFetchToolDefinition: type: object description: > Gateway-managed server tool. The gateway fetches one HTTP(S) page, reduces it to bounded text, and injects the result back into the model tool loop. required: - type properties: type: type: string enum: - phaseo:web_fetch - gateway:web_fetch parameters: type: object properties: max_chars: type: integer minimum: 1 maximum: 100000 additionalProperties: false max_chars: type: integer minimum: 1 maximum: 100000 additionalProperties: false SubagentToolDefinition: type: object required: - type properties: type: type: string enum: - phaseo:subagent parameters: type: object additionalProperties: true FusionToolDefinition: type: object required: - type properties: type: type: string enum: - phaseo:fusion parameters: type: object required: - analysis_models properties: analysis_models: type: array minItems: 2 maxItems: 8 items: type: string model: type: string additionalProperties: true SearchModelsToolDefinition: type: object required: - type properties: type: type: string enum: - phaseo:search_models parameters: type: object properties: max_results: type: integer minimum: 1 maximum: 20 GatewayPlugin: oneOf: - $ref: '#/components/schemas/WebSearchPlugin' - $ref: '#/components/schemas/WebFetchPlugin' - $ref: '#/components/schemas/ResponseHealingPlugin' discriminator: propertyName: id mapping: web: '#/components/schemas/WebSearchPlugin' web-fetch: '#/components/schemas/WebFetchPlugin' response-healing: '#/components/schemas/ResponseHealingPlugin' ReasoningConfig: type: object properties: effort: type: string enum: - none - minimal - low - medium - high - xhigh - max nullable: true description: >- Reasoning effort. When omitted or null, `max_tokens`, `enabled` or the model's own default decides how much the model reasons. mode: type: string enum: - standard - pro summary: type: string enum: - auto - concise - detailed default: auto enabled: type: boolean max_tokens: type: integer minimum: 0 ProviderOptions: type: object description: Optional provider-specific options. properties: openai: type: object properties: context_management: type: object description: Optional OpenAI context management configuration. properties: type: type: string enum: - compaction compact_threshold: type: number required: - type prompt_cache_retention: type: string prompt_cache_options: $ref: '#/components/schemas/PromptCacheOptions' anthropic: type: object properties: cache_control: $ref: '#/components/schemas/CacheControl' xai: type: object properties: conversation_id: type: string description: xAI conversation ID, sent as the x-grok-conv-id header. google: type: object properties: cache_control: $ref: '#/components/schemas/CacheControl' cached_content: type: string cache_ttl: type: string DebugOptions: type: object description: Gateway debug controls. These flags are never forwarded upstream. properties: enabled: type: boolean return_upstream_request: type: boolean return_upstream_response: type: boolean trace: type: boolean trace_level: type: string enum: - summary - full ProviderRoutingOptions: type: object description: Provider routing preferences for gateway selection. properties: order: type: array items: type: string only: type: array items: type: string ignore: type: array items: type: string include_alpha: type: boolean description: Include alpha providers in routing (off by default). allow_fallbacks: type: boolean nullable: true description: Allow fallback to another eligible provider after failure. require_parameters: type: boolean nullable: true description: Require provider support for requested parameters before routing. required_execution_region: type: string nullable: true description: Restrict routing to providers with the requested execution region. required_data_region: type: string nullable: true description: Restrict routing to providers with the requested data region. require_zero_data_retention: type: boolean nullable: true description: Restrict routing to providers that support zero data retention. data_collection: type: string nullable: true description: >- `allow` (the default) filters nothing. `deny` is not supported yet and returns 400 unsupported_routing_filter. enum: - allow - deny zdr: type: boolean nullable: true enforce_distillable_text: type: boolean nullable: true description: >- `false` (the default) filters nothing. `true` is not supported yet and returns 400 unsupported_routing_filter. quantizations: type: array nullable: true items: type: string sort: oneOf: - type: string - type: object additionalProperties: true description: >- Rank providers for this request, for example by price, latency, or throughput. max_price: type: object properties: prompt: oneOf: - type: number - type: string completion: oneOf: - type: number - type: string image: oneOf: - type: number - type: string audio: oneOf: - type: number - type: string request: oneOf: - type: number - type: string preferred_min_throughput: oneOf: - type: number - type: object additionalProperties: type: number preferred_max_latency: oneOf: - type: number - type: object additionalProperties: type: number AnthropicContentBlock: type: object properties: type: type: string enum: - text - image - tool_use - tool_result text: type: string cache_control: $ref: '#/components/schemas/CacheControl' source: type: object properties: type: type: string media_type: type: string data: type: string url: type: string id: type: string name: type: string input: type: object tool_use_id: type: string content: type: string AnthropicUsage: type: object properties: input_tokens: type: integer description: >- Uncached input tokens. As on Anthropic, this excludes cache reads and cache writes. cache_read_input_tokens: type: integer description: Input tokens read from the provider's prompt cache. cache_creation_input_tokens: type: integer description: Input tokens written to the provider's prompt cache. cache_creation: type: object description: Cache writes split by cache lifetime. properties: ephemeral_5m_input_tokens: type: integer description: Input tokens written with a 5-minute cache lifetime. ephemeral_1h_input_tokens: type: integer description: Input tokens written with a 1-hour cache lifetime. output_tokens: type: integer cost: type: number format: double description: >- What the request costs you, in US dollars: the amount charged to your credits, the same figure as `cost_nanos`, after any data-sharing discount or zero-output waiver. Returned on Chat Completions, Responses, Messages and embeddings responses once the request is priced. On a stream it is on the final usage frame (on Messages, the final `message_delta`) and covers the whole stream. A stream leaves it out when the charge is not known as that frame is sent: on a BYOK stream, whose service fee is worked out when the stream ends (`cost_details.upstream_inference_cost` gives the model price instead), and on a stream that has already failed, which is not charged. example: 0.001234567 cost_details: $ref: '#/components/schemas/UsageCostDetails' AnthropicSystemTextBlock: type: object required: - type - text properties: type: type: string enum: - text text: type: string cache_control: $ref: '#/components/schemas/CacheControl' WebSearchPlugin: type: object description: > Adds the `phaseo:web_search` server tool to the request, so any model can search the web. The request runs, and searches are counted and billed, exactly as with a `phaseo:web_search` tool. If the request already has a web search tool, the plugin adds nothing. Other options are ignored. required: - id properties: id: type: string enum: - web enabled: type: boolean default: true engine: type: string enum: - auto - native - exa - firecrawl - parallel - perplexity - tinyfish max_results: type: integer minimum: 1 maximum: 25 max_uses: type: integer minimum: 1 search_context_size: type: string enum: - low - medium - high include_domains: type: array items: type: string exclude_domains: type: array items: type: string WebFetchPlugin: type: object description: > Adds the `phaseo:web_fetch` server tool to the request, so any model can read web pages. The request runs, and fetches are counted and billed, exactly as with a `phaseo:web_fetch` tool. If the request already has a web fetch tool, the plugin adds nothing. required: - id properties: id: type: string enum: - web-fetch enabled: type: boolean default: true engine: type: string enum: - auto - native - direct - exa - firecrawl - parallel max_uses: type: integer minimum: 1 max_content_tokens: type: integer minimum: 1 maximum: 100000 allowed_domains: type: array items: type: string blocked_domains: type: array items: type: string ResponseHealingPlugin: type: object description: > Repairs malformed JSON in buffered responses that requested `json_object` or `json_schema` output. Skipped on streams. required: - id properties: id: type: string enum: - response-healing enabled: type: boolean default: true mode: type: string enum: - safe - strict default: safe PromptCacheOptions: type: object description: >- Prompt cache mode and TTL for OpenAI and Azure OpenAI GPT-5.6 and later (ttl 30m, or 12h on OpenAI) and for DeepInfra (ttl 5m or 1h). Removed for other providers. properties: mode: type: string enum: - implicit - explicit ttl: type: string description: >- Minimum cache lifetime. OpenAI GPT-5.6 and later: 30m (default) or 12h; a request asking for 12h runs on OpenAI's Responses API. Azure OpenAI: 30m. DeepInfra: 5m or 1h. A route that cannot take 12h receives the request without it, and the removal is reported in X-Phaseo-Dropped-Params. additionalProperties: true UsageCostDetails: type: object description: Breakdown of the request's cost. properties: upstream_inference_cost: type: number format: double nullable: true description: >- On a BYOK request, what the provider charges your own key for the inference, in US dollars, at the model's listed prices. Null when the request runs on Phaseo credits, where `cost` is the whole charge. example: null headers: PublicRequestId: description: >- Server-generated public request identifier. For inference requests, this is the generation ID used in response payloads and request logs. Caller-supplied x-request-id values do not replace it. schema: type: string pattern: ^G-[0-9A-HJKMNP-TV-Z]{26}$ RequestedModel: description: >- The model the request asked for. Sent only when retired model routing answered the request with a replacement model. schema: type: string ModelSubstitution: description: >- Why and how the requested model was replaced, for example `reason=unserved; from=lab/old-model; to=lab/new-model`. Sent only when retired model routing answered the request with a replacement model. schema: type: string DroppedParams: description: >- Request parameters the client sent that the serving provider does not support, which the gateway removed instead of sending them upstream or rejecting the request, for example `top_k, min_p`. Sent only on successful responses, and only when at least one parameter from the request body was dropped. Parameters that come from a preset or a default value are not listed. schema: type: string SpendWarning: description: >- Sent while a spend rule that blocks covers the request and spend has passed its last alert threshold but not yet its block point. Lists up to three rules as rule_id, scope and resets_at, for example `rule_id=...; scope=workspace; resets_at=2026-11-01T00:00:00.000Z`. Once spend reaches the block point, requests in scope get a 429 with code spend_rule_blocked. schema: type: string securitySchemes: BearerAuth: type: http scheme: bearer description: Bearer token authentication ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.