[Issue] PostDiscussionEntry failing to post in IcM

Issue Description
Transient and sporadic failures with SRE Agent to load PostDiscussionEntry tool and post findings to IcM portal, in addition to AcknowledgeIncident tool

Thread ID
032fe504-2883-49bf-8582-fb08a544cc9a

Steps to Reproduce
1. Check analysis of incident in Incidents section
2. Check if agent posted findings to incident in IcM portal
3. If not posted, ask agent to post from the IcM incident analysis thread in agent portal
4. Agent tries and fails saying that PostDiscussionEntry (and sometimes AcknowledgeIncident/MitigateIncident) are enabled but none of the available skill provide those tools

Expected Behavior
Agent should automatically be able to use the PostDiscussionEntry and AcknowledgeIncident and MitigateIncident tools to perform automatic processing of the incidents

Actual Behavior
Agent performs analysis of the incident and reports lack of tool availability to Post, mitigate, or acknowledge incidents

Start by reproducing the listed incident-analysis flow and checking how PostDiscussionEntry, AcknowledgeIncident, and MitigateIncident are exposed to the agent's available skills. Confirm the failure against the IcM portal workflow; done means the agent can automatically use these tools to post findings, acknowledge, and mitigate incidents.

Written by the indexing model from the issue text.