FlowiseAI/Flowise · error · Error

Missing Github Access Token

Error message

Missing Github Access Token

What it means

Thrown by GithubMCP.getTools when the bound GitHub credential has no 'accessToken' value. The node needs a valid GitHub access token to call the GitHub Copilot MCP endpoint (https://api.githubcopilot.com/mcp/ or a transformed Enterprise URL) with an Authorization: Bearer header. Without it, the request cannot authenticate and the node refuses to initialize the MCPToolkit.

Source

Thrown at packages/components/nodes/tools/MCP/Github/GithubMCP.ts:116

        const accessToken = getCredentialParam('accessToken', credentialData, nodeData)
        const githubEnterpriseUrl = nodeData.inputs?.githubEnterpriseUrl

        let url = 'https://api.githubcopilot.com/mcp/'
        if (githubEnterpriseUrl) {
            // Transform e.g. https://octocorp.ghe.com -> https://copilot-api.octocorp.ghe.com/mcp
            const trimmed = githubEnterpriseUrl.trim().replace(/\/+$/, '')
            try {
                const parsed = new URL(trimmed)
                parsed.hostname = `copilot-api.${parsed.hostname}`
                parsed.pathname = '/mcp'
                url = parsed.toString().replace(/\/$/, '')
            } catch {
                url = `${trimmed}/mcp`
            }
        }

        if (!accessToken) {
            throw new Error('Missing Github Access Token')
        }

        const serverParams = {
            type: 'http',
            url,
            headers: {
                Authorization: `Bearer ${accessToken}`
            }
        }

        const toolkit = new MCPToolkit(serverParams, 'http')
        await toolkit.initialize()

        const tools = toolkit.tools ?? []

        return tools as Tool[]
    }
}

View on GitHub (pinned to abe4a8601a)

Solutions

1. Open the Github_MCP node in the editor and confirm a credential is selected in the credential dropdown.
2. Open that credential and ensure the 'accessToken' field is populated with a GitHub Personal Access Token (or OAuth token) that has the required scopes.
3. If using a credential that lacks the accessToken field, create a new GitHub credential of the correct type and re-bind it on the node.
4. Verify the credential is not saved with a blank/whitespace-only token; re-paste and save.

Example fix

// before: nodeData.credential points to a credential with empty accessToken
// after: bind a credential whose accessToken is set
const accessToken = getCredentialParam('accessToken', credentialData, nodeData)
if (!accessToken) {
    throw new Error('Missing Github Access Token')
}
// ensure the credential record has accessToken populated before selecting it on the node

const credentialData = await getCredentialData(nodeData.credential ?? '', options)
const accessToken = getCredentialParam('accessToken', credentialData, nodeData)
if (!accessToken || !accessToken.trim()) {
    // surface a user-facing config error before calling the MCP toolkit
    throw new Error('Bind a GitHub credential with a non-empty accessToken.')
}

function hasGithubAccessToken(cred: unknown): cred is { accessToken: string } {
    return typeof cred === 'object' && cred !== null
        && typeof (cred as any).accessToken === 'string'
        && (cred as any).accessToken.trim().length > 0
}

try {
    const tools = await githubMcp.getTools(nodeData, options)
} catch (e) {
    if (e instanceof Error && e.message === 'Missing Github Access Token') {
        // prompt user to bind a credential; do not retry without input change
    }
}

When it happens

Trigger: Calling getTools/init on the Github_MCP node with a credential that omits or blanks the 'accessToken' field (e.g. credential not selected, selected credential deleted, or the credential component never saved a token).

Common situations: User creates the node but forgets to attach a credential; credential is attached but the token field is empty; credential was renamed/removed so nodeData.credential resolves to nothing; migration left an old credential object with no accessToken key.

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AI-assisted analysis of FlowiseAI/Flowise@abe4a8601a (2026-08-12). Data as JSON: /api/errors/b4774f464e18545d. Report an issue: GitHub.