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Claude Desktop (Cowork) Integration

Claude Desktop on third-party inference sends every model call from Cowork, Chat, and Code sessions to a gateway you name, and LiteLLM is that gateway: unified logging, per-user and per-team budgets, model access control, and any Claude deployment behind it (Anthropic, Bedrock, Vertex AI, Foundry) without touching the client again. This page covers the two ways a device authenticates to LiteLLM, single sign-on through your identity provider (nothing to hand out or rotate, spend attributed to the person) and a static virtual key (the quickest way to try it), then what shows up in the model picker, how the same identity reaches MCP servers through the LiteLLM MCP gateway, how to ship the configuration to a fleet, and what to check when something does not work.

How it fits together​

Claude Desktop treats LiteLLM the way it treats Anthropic's own API: it discovers models with GET /v1/models at launch and sends chat traffic to POST /v1/messages with streaming and tool use, carrying Authorization: Bearer <credential> on every request. The credential is either a LiteLLM virtual key or, with single sign-on, the ID token your identity provider issued to the signed-in user, which LiteLLM validates with JWT auth on every request and maps to a LiteLLM user and teams.

SettingValue
Gateway base URLhttps://your-litellm-proxy.com, no /v1 suffix
Credential, single sign-onthe user's ID token, validated by LiteLLM JWT auth
Credential, static keya LiteLLM virtual key
Endpoints usedGET /v1/models, POST /v1/messages, and POST /mcp for MCP servers
LiteLLM versionv1.98.0 or later for model discovery, v1.89.0 or later for the issuers JWT config
Claude Desktop version1.6889.0 or later for single sign-on

Option A: Single sign-on with your identity provider​

With inferenceCredentialKind: interactive, Claude Desktop runs an OpenID Connect sign-in (authorization code with PKCE) in the system browser against your identity provider, keeps the refresh token in OS secure storage, and sends the ID token to LiteLLM as the bearer credential. LiteLLM checks the signature against the provider's signing keys, the issuer, and the audience, then maps the token's claims to a LiteLLM user and, through a groups claim, to LiteLLM teams. Nobody provisions or rotates keys, a user removed from the identity provider loses access when the token expires, MFA and conditional access apply, and the only thing the user sees is a Sign in to your organization button. This path needs a database behind LiteLLM, because users and spend are written to it.

1. Register Claude Desktop in your identity provider​

Claude Desktop is a native app, so it registers as a public client (PKCE, no client secret) with a loopback redirect URI.

In the Entra admin center create an app registration for accounts in your directory only, then under Authentication add a Mobile and desktop applications platform with the custom redirect URI http://127.0.0.1/callback. Use 127.0.0.1 rather than localhost, keep the /callback path, and add it under that platform specifically: it is the only one Entra lets use any local port, which the app needs because it picks a free port at sign-in time. No client secret or API permissions are needed. Copy the Application (client) ID and Directory (tenant) ID.

The issuer is https://login.microsoftonline.com/YOUR_TENANT_ID/v2.0 and the signing keys are at https://login.microsoftonline.com/YOUR_TENANT_ID/discovery/v2.0/keys. The stable user id claim is oid. To map users to LiteLLM teams by group, add a groups claim to the ID token under Token configuration; it carries group object ids.

2. Configure LiteLLM to validate the token​

Describe the identity provider to LiteLLM with an issuers entry (LiteLLM v1.89.0 or later). Each entry binds one iss value to its signing keys and audience and carries that provider's claim names, so several providers can sit side by side. The audience is the client id you registered: an ID token's aud is the client it was issued to, and checking it is what stops a token minted for some other app in the same tenant from reaching your gateway.

config.yaml
general_settings:
  enable_jwt_auth: true
  litellm_jwtauth:
    user_id_upsert: true
    issuers:
      - issuer: https://login.microsoftonline.com/YOUR_TENANT_ID/v2.0
        jwks_url: https://login.microsoftonline.com/YOUR_TENANT_ID/discovery/v2.0/keys
        audience: YOUR_CLIENT_ID
        user_id_jwt_field: oid
        user_email_jwt_field: email
        team_ids_jwt_field: groups

model_list:
  - model_name: claude-sonnet-5
    litellm_params:
      model: anthropic/claude-sonnet-5
      api_key: os.environ/ANTHROPIC_API_KEY
  - model_name: claude-opus-5
    litellm_params:
      model: anthropic/claude-opus-5
      api_key: os.environ/ANTHROPIC_API_KEY
  - model_name: claude-haiku-4-5
    litellm_params:
      model: anthropic/claude-haiku-4-5
      api_key: os.environ/ANTHROPIC_API_KEY

jwks_url is optional: without it LiteLLM reads jwks_uri from {issuer}/.well-known/openid-configuration. user_id_upsert: true creates the LiteLLM user on first request, so spend accrues per person under Internal Users and the oid or sub value lands on every spend log row; user_allowed_email_domain: yourcompany.com refuses tokens from any other email domain. team_ids_jwt_field: groups turns the token's group memberships into LiteLLM team memberships: create a team whose team_id equals the group's id (an Entra group object id, an Okta group name) and that team's models, max_budget, rate limits, and MCP server permissions apply to everyone in the group. LiteLLM adds the user to the team the first time a token carries that group, so they also show up under the team's members, and a user who belongs to exactly one team keeps resolving to it even when a later token omits the claim. A token whose groups match no team is still accepted as the user, with no team budget and no MCP servers, so drop the line if you do not need teams. A token whose iss matches no entry falls back to the JWT_PUBLIC_KEY_URL, JWT_AUDIENCE, and JWT_ISSUER environment variables, which is the single-provider setup JWT auth describes and works here too.

public_key_url and audience are not litellm_jwtauth keys

Anthropic's gateway guide shows litellm_jwtauth with public_key_url and audience directly under it. LiteLLM has no such keys and refuses to start with ValueError: Invalid arguments provided: ... naming public_key_url and audience. Put them in an issuers entry as above, or set JWT_PUBLIC_KEY_URL and JWT_AUDIENCE as environment variables.

3. Configure Claude Desktop​

Open the configuration window: Help > Troubleshooting > Enable Developer Mode, then Developer > Configure Third-Party Inference…. In the Connection section set Inference provider to Gateway, Gateway base URL to your proxy URL, and Credential kind to Interactive sign-in, which hides the API key field and reveals Gateway SSO IdP (OIDC): enter the Client ID and Issuer URL from step 1, leave Scopes empty for the default openid profile email offline_access, and fill Redirect port only for Okta (53180). Apply locally writes the configuration for this device, which is enough to try it out; Export produces the managed configuration for a fleet (see Rolling out to a fleet).

The exported keys, in a macOS .mobileconfig payload:

<key>inferenceProvider</key>
<string>gateway</string>
<key>inferenceGatewayBaseUrl</key>
<string>https://your-litellm-proxy.com</string>
<key>inferenceCredentialKind</key>
<string>interactive</string>
<key>inferenceGatewayOidc</key>
<string>{"issuer":"https://login.microsoftonline.com/YOUR_TENANT_ID/v2.0","clientId":"YOUR_CLIENT_ID"}</string>

For Okta the JSON is {"issuer":"https://YOUR_ORG.okta.com","clientId":"YOUR_CLIENT_ID","redirectPort":53180}. inferenceGatewayOidc is one key whose value is a JSON string (a REG_SZ on Windows, a native object in Linux's managed-settings.json); dotted keys such as inferenceGatewayOidc.clientId are never read. Leave bearerTokenType at its default id_token, which is what the issuers entry validates; Google Workspace needs access_token there, because it issues no fresh ID token on refresh and re-prompts users about hourly otherwise.

4. Verify​

On the next launch the user sees Sign in to your organization, signs in through the browser, and lands back in the app with the model picker filled from your proxy. In the LiteLLM UI, Logs shows each request under the user's id, and Internal Users shows the upserted user with spend. The same endpoints can be exercised from a shell with any ID token your provider issues for that client id:

curl https://your-litellm-proxy.com/v1/models \
  -H "Authorization: Bearer $ID_TOKEN" -H "anthropic-version: 2023-06-01"

curl -N https://your-litellm-proxy.com/v1/messages \
  -H "Authorization: Bearer $ID_TOKEN" -H "anthropic-version: 2023-06-01" -H "content-type: application/json" \
  -d '{"model":"claude-sonnet-5","max_tokens":64,"stream":true,"messages":[{"role":"user","content":"hello"}]}'

The first returns the Anthropic-shaped model list the picker is built from; the second streams a reply. A 401 with Audience doesn't match means the token was issued to a different client id than the one in audience; Missing JWT Public Key URL from environment. means the token's iss matched no issuers entry; Token Expired is the state the app resolves on its own by refreshing the token, or by prompting Sign in again when the refresh fails.

Option B: Static virtual key​

A virtual key is the right credential for a proof of concept, a shared workstation, or a gateway that already hands out per-team keys. Everyone on the same managed profile shares that key and its budget, and rotating it means pushing a new profile, which is why fleets end up on single sign-on.

Create the key in the LiteLLM UI under Virtual Keys > + Create New Key, scoped to the Claude models with a max_budget, and copy it. In Claude Desktop, enable Developer Mode under Help > Troubleshooting, open Developer > Configure Third-Party Inference…, set Inference provider to Gateway, enter the Gateway base URL and the key as the Gateway API key, keep Credential kind at Static API key and Gateway auth scheme at Bearer (LiteLLM also accepts x-api-key), and apply.

Enable Developer Mode under Help > Troubleshooting Developer > Configure Third-Party Inference Gateway URL and API key fields Create a virtual key in the LiteLLM UI Claude Desktop connected through LiteLLM

The exported form is inferenceProvider: gateway, inferenceGatewayBaseUrl, and inferenceGatewayApiKey, with inferenceGatewayAuthScheme: x-api-key only if you chose that scheme. Requests then show up under that key in Logs and Usage.

Models in the picker​

Claude Desktop builds the picker from GET /v1/models and keeps only ids that contain claude or anthropic, case-insensitively, so the model_name values in your model_list are what matter, not the upstream ids behind them: claude-sonnet-5 served from Bedrock or Vertex AI passes, smart-router does not. LiteLLM does not return the anthropic_family_tier field that would let an opaque alias through the filter, so either put claude in the name or list the model in inferenceModels, which replaces discovery with exactly the entries you give (the first is the default):

[
  {"name": "claude-sonnet-5", "supports1m": true},
  {"name": "claude-opus-5", "labelOverride": "Opus 5 via LiteLLM"},
  {"name": "claude-haiku-4-5"}
]

supports1m adds a second, 1M-context picker entry for that model (the string shorthand "claude-sonnet-5[1m]" means the same); set it only on a name that exactly matches the id your proxy returns and only for deployments that accept 1M-token requests. anthropicFamilyTier (sonnet, opus, haiku, fable, mythos) with isFamilyDefault: true tells the app which entry a bare tier alias resolves to. Organizations on Claude for Teams or Enterprise also need each gateway model name on their availableModels allowlist, or it shows greyed out; Auto Router with Claude Code and Claude Desktop covers the allowlist rules and how to put an auto router behind a name the picker accepts. Non-Claude models behind LiteLLM work the same way once their model_name contains claude; add drop_params: true to those entries so the Anthropic-specific request fields Cowork and Code sessions send are dropped where the provider has no equivalent instead of failing the request.

MCP servers through the LiteLLM MCP gateway​

Managed MCP servers on Claude Desktop are managedMcpServers entries, and pointing them at LiteLLM's MCP gateway instead of at each upstream server keeps MCP traffic under the same logging, access control, and identity as inference. LiteLLM exposes every configured server on one streamable HTTP endpoint, https://your-litellm-proxy.com/mcp, authenticated with the same bearer credential; the x-mcp-servers header narrows one entry to specific servers (the per-server path /mcp/<server_name> does the same), and tools appear as <server>-<tool>.

config.yaml
mcp_servers:
  deepwiki:
    url: https://mcp.deepwiki.com/mcp
    transport: http
  github:
    url: https://api.githubcopilot.com/mcp
    transport: http
    auth_type: bearer_token
    auth_value: os.environ/GITHUB_TOKEN

Access to a server is granted rather than assumed: a signed-in user sees only the servers their team, key, or organization is permitted to use, and every other server is simply absent from tools/list. With single sign-on the grant lives on the team the token's groups map to, so create that team with the servers in its object_permission (the same call sets the models and budget the group gets):

curl -X POST https://your-litellm-proxy.com/team/new \
  -H "Authorization: Bearer $LITELLM_MASTER_KEY" -H "content-type: application/json" \
  -d '{"team_id": "GROUP_ID_FROM_THE_TOKEN", "team_alias": "Claude Desktop users",
       "models": ["claude-sonnet-5", "claude-opus-5", "claude-haiku-4-5"], "max_budget": 500,
       "object_permission": {"mcp_servers": ["deepwiki", "github"]}}'

A low-risk server can instead be opened to everyone with allow_all_keys: true (Public MCP servers), and MCP access control covers access groups and per-tool permissions. On the Claude Desktop side, a static virtual key goes in the entry's headers:

[
  {
    "name": "litellm",
    "transport": "http",
    "url": "https://your-litellm-proxy.com/mcp",
    "headers": {"Authorization": "Bearer sk-...", "x-mcp-servers": "deepwiki,github"}
  }
]

Static headers cannot carry a signed-in user's own token, so single sign-on fleets use headersHelper instead: an executable Claude Desktop runs that prints the headers as a flat JSON object, re-run on the headersHelperTtlSec schedule and again when the server answers 401 or 403 (Claude Desktop 1.46388.1 or later). A helper that obtains an ID token for the same app registration keeps chat and MCP spend on the same LiteLLM user. toolPolicy, a map of tool name to allow, ask, or blocked, sets the confirmation policy per tool. Servers that need the user's own upstream login (GitHub, Atlassian, and the like) take "oauth": true against the per-server URL https://your-litellm-proxy.com/mcp/<server_name> with LiteLLM's MCP OAuth passthrough or the gateway-hosted DCR bridge; Claude Desktop starts that sign-in only when the server answers an unauthenticated request with HTTP 401, on the loopback callback http://127.0.0.1:53280/callback. A server marked available_on_public_internet: false is hidden from callers outside the private ranges (or the mcp_internal_ip_ranges you set), so a laptop on the public internet sees only the rest (MCP servers on the public internet).

Claude Desktop's built-in connectors ("server": "microsoft365", "github", "websearch") run inside the app against those vendors' own APIs and never pass through LiteLLM; only url entries do. To keep GitHub or Microsoft 365 traffic under LiteLLM, configure the vendor's MCP server as an mcp_servers entry on the proxy and point a url entry at it.

Rolling out to a fleet​

Export in the configuration window turns what you applied into the template your MDM expects: a .mobileconfig (macOS), a .reg file or ADMX (Windows), or Intune OMA-URI JSON. Managed configuration is read from /Library/Managed Preferences/<user>/com.anthropic.claudefordesktop.plist on macOS, HKLM\SOFTWARE\Policies\Claude (or HKCU) on Windows, and /etc/claude-desktop/managed-settings.json on Linux, while Apply locally writes to ~/Library/Application Support/Claude-3p/configLibrary/, %LOCALAPPDATA%\Claude-3p\configLibrary\, and ~/.config/Claude-3p/configLibrary/. bootstrapUrl lets devices fetch the same configuration from a server you host instead of an MDM profile; LiteLLM does not serve a bootstrap endpoint today.

Two more keys matter behind LiteLLM. inferenceCustomHeaders, a JSON object of extra headers sent on every inference and discovery request (routing and tenant headers only, never credentials), is how a profile stamps x-litellm-tags on every request, which tag budgets, tag routing, and the Usage page all group by; {"x-litellm-tags": "claude-desktop,finance"} gives a department its own budget without a separate key or team. inferenceStreamIdleTimeoutSec (300 to 1800) extends how long a Cowork or Code session waits for model output on a streaming response, but only when LiteLLM writes SSE keep-alive pings while the upstream model is silent; a response with nothing on it still times out at the default.

Usage attribution​

Under single sign-on every request is attributed to the LiteLLM user upserted from the token, and to the team when a groups claim maps to one, so Usage breaks spend down by person and by team and budgets apply at both levels. Under a static key the key is the unit, and one key per team or per purpose with its own max_budget is the practical granularity. Either way, x-litellm-tags from inferenceCustomHeaders adds a third axis, such as a department or cost center, without changing who authenticates.

Troubleshooting​

The model picker is empty, or the connection test passes but no Claude model appears. Discovery keeps only ids containing claude or anthropic; rename the model_name or set inferenceModels. LiteLLM older than v1.98.0 answers /v1/models in OpenAI shape only, which the app cannot parse; upgrade, or set inferenceModels so the app skips discovery.

Authentication Error, Missing JWT Public Key URL from environment. on every request. The token's iss matched no issuers entry (compare the iss claim in the token with the issuer value; Entra tokens carry /v2.0 at the end) and no JWT_PUBLIC_KEY_URL fallback is set.

ValueError: Invalid arguments provided naming public_key_url and audience at startup. The config followed Anthropic's snippet. Move those values into an issuers entry.

Authentication Error, Validation fails: Audience doesn't match. The token was issued to a different client id; audience must be the client id of the Claude Desktop app registration, and bearerTokenType must be left at id_token, since an access token's audience is the API it was requested for.

Token Expired, or users are asked to sign in every hour. Refresh needs the offline_access scope, which the default scopes include; a custom scopes value in id_token mode must list it explicitly. Google Workspace re-prompts hourly in id_token mode regardless; use bearerTokenType: access_token there.

gateway SSO: server does not advertise device_authorization_endpoint. The app could not read inferenceGatewayOidc, usually because it was pushed as dotted keys or invalid JSON. Re-export from the configuration window.

OIDC discovery failed (HTTP 404) or (HTTP 405). The issuer value is the metadata URI instead of the issuer base URL; remove the /.well-known/openid-configuration suffix.

The browser shows Connected but the app reports Token exchange failed (HTTP 401). The identity provider registration is a confidential (Web) client expecting a secret. Register a Native application (Okta) or a Mobile and desktop applications platform (Entra) instead; the type cannot be changed after creation.

tools/list on the LiteLLM MCP endpoint comes back empty. The signed-in user has no grant on any server: the token's groups match no team, or the team's object_permission lists no mcp_servers. Add the servers to the team or set allow_all_keys: true on the server.

Requests to a non-Claude model fail with 400. Cowork and Code sessions send Anthropic-specific fields; set drop_params: true on that model_list entry.

The 1M context window entry is missing. supports1m sits on an inferenceModels entry whose name does not match the discovered id exactly.

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