[GH-ISSUE #20] Unable to process optional parameters #17

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opened 2026-10-18 21:10:19 +00:00 by bsakaguchi · 1 comment

bsakaguchi commented

2026-10-18 21:10:19 +00:00

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Originally created by @peanutsugarlove on GitHub (Apr 2, 2025).
Original GitHub issue: https://github.com/open-webui/mcpo/issues/20

Is this a problem? My model reported an error without providing some optional parameters.
MCP can only be used when he provides all the parameters, such as fetch：

url*
URL to fetch
max_length：
Maximum number of characters to return.
start_index：
On return output starting at this character index, useful if a previous fetch was truncated and more context is required.
raw：
Get the actual HTML content if the requested page, without simplification

All these parameters need to be output by the model, and there will be no issues on other MCP supported platforms

Originally created by @peanutsugarlove on GitHub (Apr 2, 2025). Original GitHub issue: https://github.com/open-webui/mcpo/issues/20 Is this a problem? My model reported an error without providing some optional parameters. MCP can only be used when he provides all the parameters, such as fetch： url* URL to fetch max_length： Maximum number of characters to return. start_index： On return output starting at this character index, useful if a previous fetch was truncated and more context is required. raw： Get the actual HTML content if the requested page, without simplification All these parameters need to be output by the model, and there will be no issues on other MCP supported platforms

bsakaguchi closed this issue

2026-10-18 21:10:19 +00:00

bsakaguchi commented

2026-10-18 21:10:20 +00:00

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@tjbck commented on GitHub (Apr 2, 2025):

If they're marked as optional, most likely it's a model issue

@tjbck commented on GitHub (Apr 2, 2025): If they're marked as optional, most likely it's a model issue